JP2016202077A - Pet food - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pet food comprising unsaturated fatty acid-containing oils and fats and having high storage stability and palatability.SOLUTION: A pet food comprises following components (A)-(E): (A) oils and fats comprising an unsaturated fatty acid having three or more double bonds as a constituent fatty acid, (B) a mineral component selected from iron, iron compounds, copper and copper compounds, (C) a citric acid and/or salt thereof, 10 or more times larger than the (B) component in total amount in terms of molar ratio, (D) lecithin and (E) defatted sesame.SELECTED DRAWING: None

Description

  The present invention relates to a pet food containing an unsaturated fatty acid-containing fat.

  Due to the pet boom, the number of pets is increasing, and with it, diseases similar to human adult diseases such as pet obesity, diabetes and liver disease are increasing due to aging of pets, lack of exercise, overnutrition and the like. In addition, dogs and cats who become obese due to hormonal imbalance after contraceptive surgery are increasing. Many pet foods for preventing such obesity and weight gain have been developed. For example, a pet food has been devised that contains a large amount of fats and oils containing unsaturated fatty acids in the molecule such as ω3 fatty acids and ω6 fatty acids that are expected to have various physiological effects.

  However, such pet foods containing a large amount of unsaturated fatty acids are easily oxidized depending on the storage environment, and may affect odor, taste and the like. It is also known that when fats and oils with a high unsaturated fatty acid content are blended with minerals such as copper, iron, manganese and cobalt necessary for pet food, the oxidation reaction of fats and oils is promoted and long-term storage stability is further reduced. ing.

  On the other hand, a technique for blending a vitamin C derivative (Patent Document 1) and a technique for controlling the content of iron ions and copper ions in a pet food while containing a naturally occurring antioxidant (Patent Document 2) This improves the long-term storage stability. Recently, it has been found that the oxidation of unsaturated fatty acids can be effectively prevented by using lecithin, which is said to have an antioxidant action, together with citric acid or a salt thereof (Patent Document 3).

JP 2005-204659 A JP 2007-110916 A JP 2012-5478 A

  Provided is a means for further improving oxidative stability in a pet food containing fats and oils containing unsaturated fatty acids having three or more double bonds as constituent fatty acids and mineral components such as iron and copper.

  As a result of studying to further improve the stability of a pet food containing a fat and oil containing a fatty acid containing a plurality of unsaturated bonds and a mineral component, the present inventor, surprisingly, lecithin and citric acid or a salt thereof, The present inventors have found that the oxidation stability of the pet food can be remarkably improved when used in combination with defatted sesame.

That is, the present invention relates to the following 1) and 2).
1) Pet food containing the following components (A) to (E).
(A) Fats and oils containing unsaturated fatty acids having three or more double bonds as constituent fatty acids (B) Mineral components selected from iron, iron compounds, copper and copper compounds (C) Citric acid and / or salts thereof (D) lecithin (E) defatted sesame 2) (A) fats and oils containing unsaturated fatty acids having three or more double bonds as constituent fatty acids, and (B) iron, iron The composition comprising (C) citric acid and / or a salt thereof, (D) lecithin and (E) defatted sesame in a composition containing a compound, copper and a mineral component selected from copper compounds Antioxidation method of things.

  Since the pet food of the present invention is remarkably excellent in long-term storage stability, it becomes possible to express physiological functions based on unsaturated fatty acids such as ω3 fatty acids and ω6 fatty acids containing a plurality of unsaturated bonds over a long period of time. .

  The pet food of the present invention contains (A) an oil / fat containing an unsaturated fatty acid having 3 or more double bonds (hereinafter also simply referred to as a highly unsaturated fatty acid) as a constituent fatty acid. The content of the highly unsaturated fatty acid in the constituent fatty acids of the fat is preferably 4% by mass or more, more preferably 5% by mass or more, and further preferably 6% by mass or more from the viewpoint of the health of pet skin and hair. And preferably 75% by mass or less, more preferably 70% by mass or less, and still more preferably 65% by mass or less. Moreover, Preferably it is 4-75 mass%, More preferably, it is 5-70 mass%, More preferably, it is 6-65 mass%.

  The content of fats and oils containing highly unsaturated fatty acids as constituent fatty acids in the pet food is preferably 1% by mass or more, more preferably 2% by mass or more, more preferably 2.5% by mass or more, and further preferably. Is 3% by mass or more, and preferably 45% by mass or less, more preferably 40% by mass or less, and still more preferably 35% by mass or less. Moreover, Preferably it is 1-45 mass%, More preferably, it is 2-45 mass%, More preferably, it is 2.5-40 mass%, More preferably, it is 3-35 mass%.

Here, as the polyunsaturated fatty acid, polyunsaturated fatty acid having 18 to 24 carbon atoms is preferable. Specifically, α-linolenic acid, γ-linolenic acid, arachidonic acid, eicosapentaenoic acid (EPA), Docosahexaenoic acid (DHA) is exemplified, and the content of the six fatty acids in the constituent fatty acids of the component (A) is preferably 3.0% by mass or more, more preferably 3.5% by mass or more. 4.0 mass% or more is more preferable.
In addition, as a fatty acid which comprises the fats and oils of a component (A), you may contain the unsaturated fatty acid and saturated fatty acid which have two or one double bond other than a highly unsaturated fatty acid. Here, the unsaturated fatty acid having two double bonds includes an unsaturated fatty acid having 16 to 24 carbon atoms, preferably linoleic acid, and the unsaturated fatty acid having one double bond has 16 to 24 carbon atoms. Unsaturated fatty acids such as oleic acid and palmitooleic acid are preferred. Moreover, as a saturated fatty acid, a C12-C18 saturated fatty acid is mentioned, A palmitic acid, a stearic acid, etc. are suitable.

In this invention, you may contain fats and oils which do not contain fats and oils other than a component (A), ie, a highly unsaturated fatty acid, as a constituent fatty acid. The content of the total fats and oils in the pet food of the present invention is preferably 50% by mass or less, more preferably 45% by mass or less, and still more preferably 40% by mass or less from the viewpoints of palatability and removal of unpleasant odor of the pet food. And preferably 6% by mass or more, more preferably 8% by mass or more. Moreover, 6-50 mass% is preferable, 6-45 mass% is more preferable, 6-40 mass% is more preferable, 8-35 mass% is further more preferable.
Moreover, the content of unsaturated fatty acids having 3 or more double bonds in the constituent fatty acids of all fats and oils contained in pet food is preferably 5% by mass or more, more preferably 10% by mass or more, more preferably 15% by mass or more. More preferably, it is 20% by mass or more, and preferably 80% by mass or less, more preferably 75% by mass or less, more preferably 70% by mass or less, and further preferably 65% by mass or less. Moreover, Preferably it is 5-80 mass%, More preferably, it is 10-75 mass%, More preferably, it is 15-70 mass%, More preferably, it is 20-65 mass%.

  As the oils and fats used in the pet food of the present invention, safflower oil, olive oil, cottonseed oil, corn oil, rapeseed oil, soybean oil, palm oil, sunflower oil, linseed oil containing the above highly unsaturated fatty acids as constituent fatty acids, Sesame oil, lard, beef tallow, fish oil, milk fat, coconut oil, coconut oil, rice bran oil, shiso oil, sesame oil, evening primrose oil, hemp seed oil and the like. Among these, linseed oil, fish oil, shiso oil, sesame oil, evening primrose oil, and hemp seed oil containing many unsaturated fatty acids having three or more double bonds as constituent fatty acids are preferable. However, it is not restricted to what was mix | blended as fats and oils, and when this is contained in other plant raw materials or animal raw materials, this is also included. Moreover, diglyceride may be contained in the fats and oils.

  The pet food of the present invention also contains a mineral component selected from iron, an iron compound, copper and a copper compound as the component (B). Examples of the iron compound include iron sulfate, ferric chloride, ferrous fumarate, ferrous carbonate, and iron oxide. The content of the iron compound in the pet food is within an acceptable range in pet food blending, preferably 0.00001% by mass or more, more preferably 0.00005% by mass or more, and further preferably 0.0001% by mass in terms of iron. % Or more, and preferably 1% by mass or less, more preferably 0.3% by mass or less, and still more preferably 0.1% by mass or less. Moreover, Preferably it is 0.00001-1 mass%, More preferably, it is 0.00005-0.3 mass%, More preferably, it is 0.0001-0.1 mass%.

  Examples of the copper compound include copper sulfate, copper chloride, copper oxide, copper carbonate, copper sulfide, copper chlorophyll and the like. The content of the copper compound in the pet food is within an acceptable range in the pet food composition, preferably 0.00001% by mass or more, more preferably 0.00005% by mass or more, and further preferably 0.0001% by mass in terms of copper. % And preferably 0.1% by mass or less, more preferably 0.03% by mass or less, and still more preferably 0.01% by mass or less. Moreover, Preferably it is 0.00001-0.1 mass%, More preferably, it is 0.00005-0.03 mass%, More preferably, it is 0.0001-0.01 mass%.

  Of these mineral components, iron or an iron compound and copper or a copper compound are preferably used in combination. In the present invention, the total content of these mineral components is preferably 0.0005% by mass or more, more preferably 0.0005% by mass or more, and still more preferably 0.001 in terms of mineral (iron conversion and copper conversion). It is at least 1% by mass, preferably at most 1% by mass, more preferably at most 0.5% by mass, even more preferably at most 0.1% by mass. Moreover, Preferably it is 0.0005-1 mass%, More preferably, it is 0.0005-0.5 mass%, More preferably, it is 0.001-0.1 mass%.

  The pet food of the present invention may contain manganese, cobalt, calcium, phosphorus, sodium, potassium and the like as a mineral component in addition to iron and copper. These mineral components are blended as, for example, manganese oxide, cobalt carbonate, calcium carbonate, calcium phosphate, sodium chloride, potassium chloride and the like.

  The pet food of the present invention further contains citric acid and / or a salt thereof as component (C), and the total amount thereof is 10 times or more in molar ratio with respect to component (B). Here, examples of the citrate include alkali metal salts and alkaline earth metal salts, and alkali metal salts are particularly preferable. The alkali metal salt means a normal salt of citric acid (trialkali metal salt), a monohydrogen dialkali metal salt, and a dihydrogen alkali metal salt. Examples of the alkali metal salt of citric acid include sodium salt and potassium salt, and sodium salt is particularly preferable. In the present specification, unless otherwise specified, sodium citrate represents trisodium citrate (dihydrate).

  When the total amount of citric acid and its salt is 10 times or more in terms of molar ratio to the metal of component (B), the antioxidant effect due to the combined use of citric acid and / or its salt and lecithin is synergistically improved. To do. The total amount of the component (C) is preferably 11 times or more, further 12 times or more, further 15 times or more, and further 18 times or more with respect to the component (B). Further, the total amount of citric acid or a salt thereof is preferably 60 times or less in terms of molar ratio with respect to component (B) from the viewpoint of palatability.

Moreover, it is preferable that 0.5 mass% or more of component (C) is contained in pet food in conversion of a citric acid. Here, “in terms of citric acid” means that when component (C) contains citric acid and an alkali metal salt of citric acid (hereinafter also referred to as citric acid), or component (C) is an alkali of citric acid. When it is only a metal salt, it means that the alkali metal content is replaced with hydrogen, and the mass is converted with the molecular weight of citric acid.
The content of citric acid is preferably 0.7% by mass or more, more preferably 0.75% by mass or more, more preferably 0.9% by mass or more, in terms of citric acid, from the viewpoint of storage stability and palatability. More preferably, it is 1.0 mass% or more. The upper limit of the citric acid content is preferably 5.0% by mass, more preferably 4.0% by mass in consideration of palatability and odor during storage. Moreover, Preferably it is 0.7-5.0 mass%, More preferably, it is 0.75-4.0 mass%, More preferably, it is 0.9-4.0 mass%, More preferably, it is 1.0-4.0. % By mass.

  In the pet food of this invention, a lecithin is contained as a component (D) with a component (C). Lecithin means phosphatidylcholine in a narrow sense, but broadly means glycerophospholipid. When lecithin is used for commercial or industrial purposes, it means glycerophospholipid in a broad sense and is often a mixture containing glycerophospholipid as a main component.

Examples of (D) lecithin used in the present invention include soybean lecithin, powdered soybean lecithin, egg yolk lecithin, hydrogenated soybean lecithin, hydrogenated egg yolk lecithin, rapeseed lecithin, corn lecithin, bovine brain lecithin, cow liver lecithin, rice lecithin and the like. Can be mentioned. In addition, as a component of soybean lecithin generally used in food and feed, phosphatidylcholine (PC), phosphatidylethanolamine (PE), phosphatidylinositol (PI), and phosphatidic acid (PA) are present in descending order of content. These alone are treated as lecithin in the present invention. Moreover, PC-DHA etc. which DHA couple | bonded as a constituent fatty acid of PC are also mentioned as a lecithin. Among these, PE is known to be a component having a high antioxidant activity (Patent Document 3). Therefore, it is desirable that the mixture has a high PE content and contains a large amount of highly unsaturated fatty acids. Things are desirable.
Soybean lecithin, powdered soybean lecithin, hydrogenated soybean lecithin, egg yolk lecithin, and rice lecithin are more preferable from the viewpoint of flavor, odor, and cost, and among them, soybean lecithin and rice lecithin are preferable from the viewpoint of expression of the effect and cost. Rice lecithin can be obtained by a degumming process of rice oil and the like, and since it has a low viscosity, it also contributes to an improvement in handling properties in the pet food manufacturing process.

  Component (D) is preferably contained in an amount of 0.1% by mass or more, further 0.3% by mass or more, and further 0.5% by mass or more based on the fat of component (A) from the viewpoint of the antioxidant effect. From the viewpoint of higher antioxidant effect and flavor, it is preferably 0.6% by mass or more and 20.0% by mass or less, more preferably 1.0% by mass or more and 15.0% by mass or less.

  In the present invention, the amount of lecithin (D) refers to an amount in terms of phospholipid, which is acetone-insoluble, and this amount in terms of phospholipid is edited by Japan Oils and Fats Science Society, “Standard Oil Analysis Test Method 5.3.3.1”. It can be measured by the method described in “-86 Phospholipid Phosphorus Composition”. For example, soy lecithin generally used in foods and the like includes acetone-soluble components such as triglyceride, and is intended to exclude such components. The amount of lecithin that is insoluble in acetone is often about 60% by mass in a lecithin source (for example, an agent marketed as soybean lecithin). In addition, the phospholipid content in the pet food can be preferably determined after extracting the fat from the food with a chloroform / methanol solvent. The phosphorus content in the fat is quantified using the colorimetric method of the standard fat analysis method (Japan Oil Chemical Association, 2.4.11-1996) (conversion factor 25.4 from phosphorus amount). The value of the phospholipid content by this quantitative method agrees well with the amount of phospholipid equivalent which is acetone insoluble matter.

  The content of the component (D) is preferably 0.06% by mass or more, more preferably 0.1% by mass or more, and still more preferably 0.1% by mass in the total amount of the pet food of the present invention from the viewpoint of the antioxidant effect and flavor. It is 2% by mass or more, preferably 6% by mass or less, more preferably 3% by mass or less, and further preferably 2% by mass or less. Moreover, Preferably it is 0.06-6 mass%, More preferably, it is 0.1-3 mass%, More preferably, it is 0.2-2 mass%.

  In the pet food, the PE content as the component (D) is preferably 0.03% by mass or more, and more preferably 0.04% by mass or more from the viewpoint of a high antioxidant effect. Furthermore, content of a component (D) is 0.5 to 75 mass% with respect to the highly unsaturated fatty acid which is a structural component of the fat of a component (A), Furthermore, 0.5 to 50 mass% The following is preferable from the viewpoint of a high antioxidant effect.

The pet food of the present invention contains defatted sesame as the component (E).
The defatted sesame is a component remaining after separating the oil-soluble component (sesame oil) from the sesame. The defatted sesame can be obtained by, for example, squeezing sesame seeds or extracting the sesame seeds with a solvent such as ethanol or hexane to separate the oil-soluble component and recovering the remaining residue. The kind of sesame used as the raw material of said (E) defatted sesame is not specifically limited, Arbitrary seeds and varieties can be used.

The content of the (E) defatted sesame in the pet food of the present invention is preferably 2.5% by mass or more, more preferably 3% by mass or more, and further preferably 4% by mass or more, as the content per dry matter. And preferably it is 20 mass% or less, More preferably, it is 15 mass% or less. Moreover, Preferably it is 2.5-20 mass%, More preferably, it is 3-20 mass%, More preferably, it is 4-15 mass%.
Further, from the viewpoint of obtaining a higher antioxidant effect, the mass ratio (E / D) of the component (D) and the component (E) is preferably 1 or more, more preferably 5 or more, more preferably 10 or more, and more preferably. 15 or more, and preferably 100 or less, more preferably 50 or less, more preferably 25 or less, more preferably 20 or less. Moreover, Preferably it is 1-100, More preferably, it is 5-50, More preferably, it is 5-25, More preferably, it is 10-20, More preferably, it is 15-20.

  In the blended system of fats and oils containing highly unsaturated fatty acids as constituent fatty acids as in the present invention, excellent antioxidant power is exhibited by the coexistence of citric acid and lecithin (comparative example, the above) Patent Document 3) When the defatted sesame is further blended with this, the antioxidant power is dramatically improved without impairing the palatability (Example).

The pet food of the present invention further increases the antioxidant power by containing at least one polyphenol selected from catechin, curcumin, quercetin, and myricitrin. Among these, catechins are particularly preferable because of their high antioxidant effect. The catechins may be those having a 3,3 ′, 4 ′, 5,7-flavanpentol skeleton, such as catechin, epicatechin, gallocatechin, epigallocatechin, catechin gallate, epicatechin gallate, gallocatechin gallate. And epigallocatechin gallate. These catechins may use tea extracts.
As the curcumin source, a turmeric extract, a ginger extract or the like may be used. As the quercetin source, an onion peel extract, an apple peel extract or the like may be used. A bayberry extract may be used as the myricitrin source.

  The polyphenol content is preferably 0.01% by mass or more, more preferably 0.02% by mass or more, and further preferably 0.03% by mass in the pet food of the present invention from the viewpoint of the antioxidant effect and flavor. And preferably 35% by mass or less, more preferably 5.0% by mass or less, and still more preferably 2.0% by mass or less. Moreover, Preferably it is 0.01-35 mass%, More preferably, it is 0.02-5.0 mass%, More preferably, it is 0.03-2.0 mass%. Further, from the viewpoint of obtaining a higher oxidation stabilizing effect, the mass ratio (D / F) of the component (D) and the polyphenol (F) is preferably 1/1 to 100/1, more preferably 2/1 to 80 /. 1.

  The pet food of the present invention preferably has a pH of 3.5 to 7.0. Within this range, oxidation of the component (A) by the component (B) is more effectively suppressed, and the palatability is also improved. It is preferable that the pH is 4.0 to 7.0, more preferably 4.5 to 6.8, since the effect of suppressing oxidation is further enhanced and the odor during storage is improved. In order to include citric acids and make the pH within such a range, there is a method of adding a pH adjusting agent in addition to citric acid. Among such methods, a method using citric acid and citrate in combination is preferable because it is easy to adjust the pH, has good palatability, and has a uniform taste. In particular, it is preferable to use the above-mentioned alkali metal citrate as the citrate.

In addition, "pH of pet food" means pH when pet food is measured by the following method.
<Method for measuring pH of pet food>
Qualitative filter paper (10 g of pet food) was added to 60 mL of ion exchange water at 45 ° C. (preferably ion exchange water having an electric conductivity of 0.01 mS / m or less at 25 ° C.) and allowed to stand for 1 hour. No. 1, manufactured by Advantec), and the filtrate was subjected to pH measurement at 25 ° C.
In addition, when the property of pet food is solid, it is preferable to perform the said stirring operation after grind | pulverizing finely using a mortar etc.

  The pet food of the present invention preferably further contains a carbohydrate. Examples of the carbohydrate source include monosaccharides, oligosaccharides, polysaccharides, dietary fibers, and starches. Starches include waxy corn starch, corn starch, wheat starch, rice starch, glutinous rice starch, potato starch, honeydew starch, tapioca starch, sago starch, or those that have been chemically treated or chemically modified. Can be mentioned. Carbohydrates may be contained as cereals, and examples of cereals include corn, barley, wheat, rye, sorghum, rice, fin, awa, amarasansus, quinoa and the like. The carbohydrate is preferably 10% by mass or more, more preferably 20% by mass or more, further preferably 30% by mass or more, and preferably 70% by mass or less, more preferably 60% by mass or less, more preferably 60% by mass or more in pet food. It is preferable to contain it at 50 mass% or less from the viewpoint of economically, obesity-preventing effect, ingestion, stool condition, and health and beauty. Moreover, it is preferable to contain 10-70 mass%, 20-60 mass%, and also 30-50 mass%.

In the pet food of the present invention, it is preferable that animal or plant protein is further included from the viewpoint of preventing obesity, ingestion, nutritional balance, and the appearance of healthy, beautiful animals. More preferred is a sex protein. Examples of animal protein include milk protein such as casein, but animal meat protein is preferable from the viewpoint of obesity prevention effect and ingestion. Such animal meat proteins include cattle, pigs, sheep, rabbits, kangaroos and other meats and beef, and by-products and processed products thereof; chicken, turkey, quail and other meats and by-products and houses. Articles: Fish meat such as fish and white fish, and by-products and processed products thereof; lettering of the above raw materials such as meat meal, meat bones, chicken meal, portary meal, fish meal, and the like. Among these, chicken and fish are particularly preferable from the viewpoint of preventing obesity. When mixing and using several meat protein, it is preferable to contain a chicken and / or a fish meat in 30-100 mass% in meat, and also 50-100 mass%.
As the vegetable protein, soybean protein, wheat protein, wheat gluten, corn gluten and the like are preferable.

  The content of animal or vegetable protein in the pet food of the present invention is preferably 5% by mass or more, more preferably 10% by mass or more, still more preferably 15% by mass or more, and preferably 70% by loss on drying. % Or less, more preferably 60% by mass or less, and still more preferably 40% by mass or less. Moreover, Preferably it is 5-70 mass%, More preferably, it is 10-60 mass%, More preferably, it is 15-40 mass%.

  The pet food of the present invention may further contain a plant sterol. The plant sterol is preferably contained in the pet food in an amount of 0.1% by mass or more, more preferably 0.5% by mass or more, from the viewpoint of the cholesterol lowering effect. Moreover, the upper limit of plant sterol content should just be the range of 0.1-30 mass%. Examples of plant sterols include free forms such as α-sitosterol, β-sitosterol, stigmasterol, campesterol, α-sitostanol, β-sitostanol, stigmasteranol, campestanol, and cycloartenol, and the like. And fatty acid esters, ferulic acid esters, cinnamic acid esters and the like.

  The pet food of the present invention can further contain bran, potatoes, vegetables, vitamins and the like. As rice bran, rice bran, bran or the like is used, and as rice cake, soybean meal is used. Examples of vegetables include vegetable extracts. Examples of vitamins include A, B1, B2, D, E, niacin, pantothenic acid, carotene and the like, and it is preferable to contain 0.05 to 10% by mass. In addition, a gelling agent, a shape-retaining agent, a pH adjuster, a seasoning, an antiseptic, a nutrition reinforcing agent and the like that are generally used in pet foods can also be contained. Furthermore, synthetic antioxidants such as BHA, BHT, ethoxyquin, TBHQ, and propyl gallate can be used in combination. Even in that case, the technique of the present invention makes it possible to reduce the number of synthetic antioxidants. These synthetic antioxidants are preferably not included in the pet food of the present invention.

  The pet food of the present invention can be produced by mixing the above ingredients into a desired form, but it is preferable to add the fat component of component (A) last. For example, citric acid and citrate are mixed together with grains, meat meal, and mineral components such as iron and copper, and after sufficient mixing, they are extruded by an extruder while being hydrated with water or steam. Thereafter, it is preferably dried with hot air until the water content becomes 10% by mass or less. It is desirable to coat the fats and oils whose double bonds are rich in three or more fatty acids after drying with hot air. Lecithin and defatted sesame may be added together with citric acid or the like, or may be added together with fats and oils.

  In addition, the pet food of the present invention may be in any form such as dry type, wet type, semi-moist type, jerky type, biscuit type, gum type, granular, powdery, soup, etc. Is preferable from the viewpoint of easy storage. Usually, in the case of a dry type, a plurality of times of pet food is contained in a laminate package. However, after opening, the environment is easy to come into contact with air, so that oxidation tends to proceed. Therefore, it can be said that the pet food of the present invention is more effective in the dry type.

Examples of dry-type pet foods include kibble shapes, flat plate shapes, and bone shapes. From the standpoint of obtaining pets that are easily chewable and easy to handle, the bulk density is preferably 100 to 900 kg / m ³ , particularly 300 to 700 kg / m ³ . However, with such a bulk density, the surface area is increased and a large number of voids are likely to be present on the surface, so it can be said that the oxidation of fats and oils in pet food is likely to proceed. However, even in such a case, since the pet food of the present invention has a high antioxidant power, it is possible to take advantage of the advantages described above. For this reason, it is excellent in the palatability of a pet, a flavor etc. do not deteriorate over a long period of time, and can also receive the benefit of the desired physiological effect resulting from a highly unsaturated fatty acid.

With respect to the above-described embodiment, the following aspects are further disclosed in the present invention.
<1> A pet food containing the following components (A) to (E).
(A) an oil or fat containing an unsaturated fatty acid having three or more double bonds as a constituent fatty acid,
(B) Mineral component selected from iron, iron compound, copper and copper compound,
(C) Citric acid and / or salt thereof The total amount is 10 times or more of component (B) in molar ratio,
(D) Lecithin (E) defatted sesame <2> The pet food according to <1>, wherein the component (A) contains 4% by mass or more of an unsaturated fatty acid having 3 or more double bonds in the constituent fatty acid.
<3> The pet food according to <1> or <2>, wherein the mass ratio ((E) / (D)) of defatted sesame (E) and lecithin (D) is 1 to 100.
<4> The pet food according to any one of <1> to <3>, wherein the lecithin is rice lecithin.
<5> The pet food according to any one of <1> to <4>, wherein the salt of citric acid is an alkali metal citrate salt.
<6> The pet food according to any one of <1> to <5>, wherein the component (C) includes both citric acid and a salt of citric acid.
<7> The pet food according to any one of <1> to <6>, wherein the pH is 3.5 to 7.0.
<8> The pet food according to any one of <1> to <7>, which is a dry type.
<9> (A) a fat and oil containing an unsaturated fatty acid having three or more double bonds as a constituent fatty acid, and (B) a mineral component selected from iron, an iron compound, copper and a copper compound, (C) Citric acid and / or a salt thereof, (D) lecithin and (E) defatted sesame are blended, and the method for preventing oxidation of the composition.
<10> The content of the component (A) in the pet food is preferably 1% by mass or more, more preferably 2% by mass or more, further preferably 2.5% by mass or more, and further preferably 3% by mass or more. And preferably 45% by mass or less, more preferably 40% by mass or less, still more preferably 35% by mass or less, or preferably 1 to 45% by mass, more preferably 2 to 45% by mass, further preferably <2.5> to 40% by mass, more preferably 3 to 35% by mass, and pet food according to <1> to <8>.
The total content of <11> component (B) is preferably 0.0005% by mass or more, more preferably 0.0005% by mass or more, in terms of mineral (iron conversion and copper conversion) with respect to pet food. More preferably, it is 0.001 mass% or more, and preferably 1 mass% or less, More preferably, 0.5 mass% or less, More preferably, it is 0.1 mass% or less, Preferably it is 0.0005-1 The pet food according to <1> to <10>, which is by mass%, more preferably 0.0005 to 0.5 mass%, and still more preferably 0.001 to 0.1 mass%.
The total content of <12> component (C) is preferably 0.7% by mass or more, more preferably 0.75% by mass or more, and still more preferably citric acids in terms of citric acid, relative to pet food. 0.9 mass% or more, and preferably 5.0 mass% or less, more preferably 4.0 mass% or less, or preferably 0.7 to 5.0 mass%, more preferably 0.75. The pet food according to <1> to <11>, which is ˜4.0% by mass, more preferably 0.9 to 4.0% by mass, and still more preferably 1.0 to 4.0% by mass.
The content of <13> component (D) is preferably 0.06% by mass or more, more preferably 0.1% by mass or more, further preferably 0.2% by mass or more, and preferably with respect to pet food. Is 6% by mass or less, more preferably 3% by mass or less, further preferably 2% by mass or less, or preferably 0.06 to 6% by mass, more preferably 0.1 to 3% by mass, and even more preferably 0. The pet food of <1> to <12>, which is 2 to 2% by mass.
The content of <14> component (E) is preferably 2.5% by mass or more, more preferably 3% by mass or more, still more preferably 4% by mass or more, and preferably 20% by mass as the content per dry matter. % Or less, more preferably 15% by mass or less, preferably 2.5 to 20% by mass, more preferably 3 to 20% by mass, and further preferably 4 to 15% by mass. <1> to <13> Pet food.

Examples 1-5, Comparative Examples 1-3
A columnar pet food (kibble) having a diameter of 10 mm and a length of about 10 mm was manufactured by mixing and extrusion molding with an extruder using the raw materials shown in Table 1. Tables 1 and 2 show the nutritional components, calorie measurement results, and various analysis values of each pet food.

  Tables 4 to 5 show the glyceride or fatty acid composition of the oil and fat extracted from the pet food of Example 1 and the unsaturated fatty acid content having three or more double bonds.

  Further, the total fat and oil contained in each pet food was 15% by mass, and the content of unsaturated fatty acids having 3 or more double bonds in the pet food was 6.7% by mass.

  The fats and oils used in the test were prepared by blending linseed oil, soybean oil, and fish oil. Each fatty acid composition is as shown in Table 3.

Test Example 1 Oxidation stability (1)
(1) The pet food manufactured in the above Examples and Comparative Examples was stored at room temperature (about 40 ° C.) for 8 weeks. The POV (peroxide number) before storage (0 week) and after 8 weeks storage was measured by the following method, and POV after storage for 8 weeks was subtracted from the POV before storage (0 week) POV The amount of change was calculated. The results are shown in Tables 1 and 2 together.

<Measurement method of POV (peroxide value)>
The peroxide value (POV) was analyzed in accordance with 2.4.12.2-94 “Peroxide Value” of “Standard Oil and Fat Analytical Test Method” established by the Japan Oil and Fat Chemical Society.
1) Extraction of fats and oils from pet food 50 g of kibble was pulverized, passed through a 1 mm sieve, the sample was filled into a cylindrical filter paper, and set in an open column with a cock. With the cock closed, 150 mL of diethyl ether was dropped from above with a dropping funnel, and after completion of dropping, the column cock was opened to collect diethyl ether. Next, the same operation was performed with 50 mL diethyl ether. The recovered diethyl ether was removed by an evaporator to obtain an extracted fat from pet food.

2) POV measurement of fat and oil 0.5 g of fat and oil extracted from pet food was weighed into a 250 ml tall beaker and dissolved in 20 ml of a solution of acetic acid / isooctane = 3/2 (volume ratio). 0.1 mL of saturated potassium iodide solution was added to the tall beaker and shaken well for 1 minute. Thereafter, 30 mL of distilled water was added to obtain a titration sample. The titration sample was titrated with 0.01N sodium thiosulfate. At this time, a POV automatic titrator, DMP Titorino 785 type, manufactured by Metrohm Shibata Co., Ltd. was used.

(2) Results From Tables 1 and 2, in pet food with a high polyunsaturated fatty acid content, oxidative stability is improved by adding citric acid and lecithin (Comparative Example 1), but also defatted sesame. In the case (Examples 1 to 5), almost no change in POV was observed, and the oxidation stability was dramatically improved.

Claims (9)

A pet food containing the following components (A) to (E).
(A) an oil or fat containing an unsaturated fatty acid having three or more double bonds as a constituent fatty acid,
(B) Mineral component selected from iron, iron compound, copper and copper compound,
(C) Citric acid and / or salt thereof The total amount is 10 times or more of component (B) in molar ratio,
(D) Lecithin (E) defatted sesame   The pet food according to claim 1, wherein the component (A) contains 4% by mass or more of an unsaturated fatty acid having 3 or more double bonds in the constituent fatty acid.   The pet food according to claim 1 or 2, wherein a mass ratio ((E) / (D)) of defatted sesame (E) and lecithin (D) is 1 to 100.   The pet food according to any one of claims 1 to 3, wherein the lecithin is rice lecithin.   The pet food according to any one of claims 1 to 4, wherein the salt of citric acid is an alkali metal citrate salt.   The pet food according to any one of claims 1 to 5, wherein the component (C) contains both citric acid and a salt of citric acid.   The pet food according to any one of claims 1 to 6, which has a pH of 3.5 to 7.0.   The pet food according to any one of claims 1 to 7, which is a dry type.   (A) Oils and fats containing unsaturated fatty acids having three or more double bonds as constituent fatty acids, and (B) mineral components selected from iron, iron compounds, copper and copper compounds, (C) A method for preventing oxidation of the composition, comprising citric acid and / or a salt thereof, (D) lecithin and (E) defatted sesame.