JP2018201377A - Feed material for ruminants - Google Patents

Abstract

To provide a feed for ruminants that can promote rumination, and has excellent processing suitability.SOLUTION: A flaky feed material for ruminants contains kraft pulp with a number average fiber length of 1.2 mm or more measured in accordance with ISO 16065-2, and has a bulk density of 0.3-0.65 g/cmmeasured in accordance with JIS Z 7302-9, and a moisture percentage of 10-70 mass%.SELECTED DRAWING: None

Description

  The present invention relates to a ruminant feed material and a method for producing the same.

  In general, in the pastoral field, concentrated feed with high nutritional value is often used together with roughage such as pasture for the purpose of increasing the milk yield and weight gain of livestock.

  Concentrated feed contains a lot of easily digestible carbohydrates (starch, etc.) such as corn, wheat, and soybean, while roughage is fermented hay (hay, straw) and pastures that have been green-cut. Mainly (silaged).

  Ruminants are able to ingest and digest forage because they have lumens (the rumen). Rumen occupies the largest volume of the rumen's multiple stomachs and contains abundant microorganisms (lumen microorganisms) that can degrade (rumen fermentation) indigestible polysaccharides such as cellulose and hemicellulose in roughage. It is.

  However, cellulose and hemicellulose in roughage often bind to lignins and exist as lignin-cellulose complexes and lignin-hemicellulose complexes, respectively. Such a complex may not be sufficiently decomposed in rumen fermentation, and the rough feed has a problem that feed efficiency tends to be insufficient. Moreover, since an increase in the amount of undigested materials causes an increase in the amount of feces, it has been considered undesirable from an environmental point of view.

  Furthermore, roughage is easily affected by the yield and pattern of pasture and its supply is unstable. In particular, Japan relies on imports for most of the roughage, so price fluctuations are generally large, and it may be difficult to import due to various circumstances in the exporting country, which may put pressure on ranch management.

  For this reason, a ruminant feed that can be replaced with grass, has excellent feed efficiency, is inexpensive, and can be stably obtained is desired.

  Here, in order to increase the nutrient concentration in the feed, it is generally performed to mix a concentrated feed containing a large amount of easily digestible carbohydrates (starch) into the rough feed. In order to maintain the milk yield of dairy livestock or maintain the increase of meat livestock, it is necessary to increase the feed intake, but in recent years the production capacity of cattle has increased, and the milk yield has increased. This is because the amount of energy demand accompanying the increase in physique and physique exceeds the amount of energy that can be obtained only by roughage. However, carbohydrates such as starch in concentrated feeds can drastically lower the rumen pH, resulting in the occurrence of rumen acidosis. Rumen acidosis is a type of ruminant disease caused by rapid intake of carbohydrate-rich cereals, concentrates, fruits, and the like. In rumen acidosis, gram-positive lactic acid producing bacteria, particularly Streptcoccus bovis and Lactobacillus spp. Microorganisms increase in the rumen, resulting in abnormal accumulation of lactic acid or volatile fatty acid (VFA), and the pH in the rumen Decrease (pH 5 or less). The result is a decrease or disappearance of protozoa (protozoa) and certain bacteria in the lumen. In particular, acute acidosis is extremely dangerous because it causes rumen congestion and dehydration (a large amount of body fluid moves into the stomach as the gastric osmotic pressure increases), and coma and death.

  In order to prevent rumen acidosis, it is important to avoid sudden changes in feed composition, stabilize rumen fermentation, and reduce pH fluctuations. In addition, since saliva contains sodium bicarbonate and contributes to pH adjustment, it is also important to supply a feed that can secrete saliva with sufficient rumination. However, there is also a concern that rumen acidosis is feared, and if the nutritional value of the feed is lowered, energy is insufficient and milk production is reduced.

  As a feed for preventing rumen acidosis, Patent Document 1 discloses a livestock feed that is pulverized and pulverized by applying a high impact force to a woody material. Moreover, regarding the pelletized feed, Patent Document 2 proposes that the processed food residue is pelletized to produce the feed. Furthermore, Patent Document 3 describes that lignocellulose biomass is pelletized to produce ruminant feed (Japanese Patent Publication No. 2013-518880). Furthermore, Patent Document 4 describes that kraft pulp having a copper number of 90 or less is pelletized to obtain ruminant feed.

JP 2011-083281 A JP-A-10-75719 International Publication WO2011-097075 JP-A-2015-198553

  In general, in a ruminant animal, high-concentration feed such as corn is highly nutritious due to its high fermentability, increasing milk fat content and increasing crossbreeding, while developing rumen acidosis and delivery. It is known to cause various metabolic disorders before and after.

  In consideration of the feed form of feed, it may be possible to form the feed in the form of pellets, blocks, etc., or to make it easy to eat with water to prevent unselected items.

However, if the bulk density of the feed raw material is too low, the transportation cost to the processing plant is affected, and if the bulk density of the feed raw material is too high, the processability is poor.
Furthermore, if the feed material contains a lot of moisture, it may cause mold before processing, and may become a sanitary problem such as decay. On the other hand, if there is too little moisture, it may harden and impair processability, or dust may be generated.

  Accordingly, an object of the present invention is to provide ruminant animal feed that has high nutritional value, is less likely to cause various metabolic and reproductive disorders before and after the onset of rumen acidosis and promotes rumination, and has excellent processability. Is to provide raw materials.

When the inventors of the present invention diligently studied the above-mentioned problems, the average fiber length was adjusted to 1.2 mm or more, and the bulk density measured according to JIS Z 7302-9 was 0.3 to 0.65 g / cm. By mixing the kraft pulp as No. ³ , it was found that a feed material having high nutritional value, good digestion efficiency, and higher processability could be produced, and the present invention was completed.
(1) A ruminant feed material containing kraft pulp having a number average fiber length of 1.2 mm or more measured based on ISO 16065-2, and has a bulk density measured according to JIS Z 7302-9 A flaky ruminant feed material having a water content of 0.3 to 0.65 g / cm ³ and a water content of 10 to 70% by mass.
(2) The ruminant feed material according to (1), wherein the kraft pulp is derived from a wooden material.
(3) A method for producing a ruminant feed material containing kraft pulp having a number average fiber length of 1.2 mm or more measured based on ISO 16065-2, wherein the kraft pulp has a moisture content of 90% by mass or more. The slurry was dehydrated using a pressure compression apparatus, and the bulk density measured according to JIS Z 7302-9 was 0.3 to 0.65 g / cm ³ and the moisture content was 10 to 70% by mass. A method for producing a flaky ruminant feed material, comprising a step of adjusting.
(4) The method for producing a flaky ruminant feed material according to (3), wherein the pressure compression device is any one of a screw press, a filter press, a belt press, a roll press, and a centrifugal dehydrator.

  According to the present invention, it is possible to obtain a feed material that can promote rumination of ruminants, has high palatability for ruminants, and is excellent in processability. Moreover, since the feed raw material for ruminants of this invention can be manufactured from lignocellulose raw materials, such as wood, it can be supplied stably.

FIG. 1 is a photograph of the appearance of the feed material produced in Experiment 1.

Ruminant feed material The ruminant feed material of the present invention is processed into ruminant feed. Examples of ruminants include cows such as dairy cows and fattening cows, sheep, and goats. There is no particular limitation on the timing of feeding the ruminant with the feed processed based on the feed material for ruminants of the present invention, that is, the age, physique, health condition, etc. of the ruminant to be applied. It is thought that there are uses from calves to adult cattle.

  The feed material for ruminants of the present invention contains bleached or unbleached kraft pulp, but preferably contains 10% by mass or more of kraft pulp, more preferably contains 50% by weight or more, and more than 80% by weight. Is more preferable, and it may be composed only of kraft pulp. If necessary, other feed ingredients may be included. The kraft pulp is preferably oxygen delignified kraft pulp obtained by subjecting unbleached kraft pulp to oxygen delignification, preferably has a kappa number of 30 or less, more preferably has a kappa number of 5 to 15, and kappa number. 7-13 may be sufficient. If the kappa number is 30 or less, the ruminant animal has good palatability.

  The feed material for ruminants of the present invention contains kraft pulp (KP), but pulps produced by other known pulping methods can be used in combination. For example, both mechanical pulp and chemical pulp are applicable. Examples of mechanical pulp include groundwood pulp (GP), refiner groundwood pulp (RGP), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), and the like. Examples of the chemical pulp include kraft pulp (KP), dissolved kraft pulp (DKP), sulfite pulp (SP), and dissolved sulfite pulp (DSP). Either bleached pulp or unbleached pulp can be used. Of these, oxygen delignified chemical pulp and bleached chemical pulp are preferred.

  In the ruminant feed material of the present invention, the pulp may be composed of one kind or a mixture of a plurality of pulps. For example, chemical pulp (hardwood kraft pulp, softwood kraft pulp, melted hardwood kraft pulp, melted softwood kraft pulp), or mechanical pulp (crushed wood pulp, refiner groundwood pulp, thermomechanical pulp, chemithermomechanical pulp) of different raw materials and production methods ) May be used in combination of two or more.

  In the case of mechanical pulp, it is made into fiber after being processed without a selective process after grinder treatment (in the case of groundwood pulp) or after refining (in the case of refiner groundwood pulp, thermomechanical pulp, chemithermomechanical pulp). It will be possible to include pulp that is not in the pulp.

  The kraft pulp is preferably derived from wood. As the raw material wood, for example, hardwood, conifer, miscellaneous tree, bamboo, kenaf, bagasse, empty bunch after palm oil extraction can be used. Specifically, the broad-leaved trees include beech, china, birch, poplar, eucalyptus, acacia, oak, itayaka maple, senoki, elm, giraffe, honoki, willow, sen, basamushi, konara, kunugi, tochinoki, zelkova, mizume, mizuzuki Aodamo etc. are exemplified. As conifers, cedar, spruce, larch, black pine, todomatsu, himekomatsu, yew, nezuko, spruce fir, liromi, hinoki, fir, sawara, togasawara, asunaro, hiba, tsuga, kotsutsuga, hinoki, yew, inugahi, spruce (Beihiba), Lawson Hinoki (Beihi), Douglas Fir (Beimatsu), Sitka Spruce (Beisuhi), Radiata Pine, Eastern Spruce, Eastern White Pine, Western Larch, Western Fir, Western Hemlock, Tamarack and the like.

Kraft pulp The feed material for ruminants in the present invention contains kraft pulp, and particularly preferably contains kraft pulp derived from wood. In particular, in the present invention, it is possible to produce a feed material capable of promoting rumination by using kraft pulp having a number average fiber length measured based on ISO 16065-2 of 1.2 mm or more. In a preferred embodiment, the number average fiber length of the kraft pulp used in the present invention is 1.2 mm or more, and may be 1.4 mm or more or 1.6 mm or more. In general, since kraft pulp with a long fiber length is obtained by kraft cooking using a tree species having a long fiber length, the number average fiber length of the kraft pulp can be adjusted by adjusting the lignocellulosic material as a raw material. . For example, since the fiber length of conifers is often longer than the fiber length of hardwoods, a pulp having a long average fiber length can be obtained by producing kraft pulp with an increased proportion of coniferous wood.

  In a preferred embodiment, the kraft pulp used in the present invention may be beaten. In particular, in the present invention, production of feed raw materials using kraft pulp having a Canadian standard freeness (CSF) of 400 ml or more facilitates the digestion rate of ruminant rumen and facilitates rumination. In a more preferred embodiment, the Canadian standard freeness of the kraft pulp used in the present invention is 450 ml or more, and may be 500 ml or more or 600 ml or more. In general, the Canadian standard freeness of kraft pulp can be adjusted by treating with a known beating machine such as a double disc refiner, a single disc refiner, a conical refiner or a PFI mill.

In a preferred embodiment, the kraft pulp used in the present invention has a breaking length of 7.5 km or more, more preferably 8.8 km or more, and further preferably 9.5 km or more. The breaking length means the length of the paper when it is cut by its own weight when one end of the paper is fixedly suspended, and is generally expressed in kilometers. In the present invention, the breaking length of kraft pulp means the breaking length measured based on JIS P 8113 for hand-made paper having a basis weight of 60 g / m ² manufactured from the pulp. In the present invention, it is preferable to produce a feed raw material from kraft pulp having a long breaking length because it can be a feed raw material that is easily ruminated in ruminants. Although there is no upper limit of the tearing length, it can be, for example, 20 km or less, or 18 km or less.

  The kappa number of the kraft pulp used in the present invention is not particularly limited, but is preferably 10 or more, more preferably 15 or more, and may be 20 or more or 22 or more. The upper limit of the copper is not particularly limited, but can be 30 or less.

  When producing kraft pulp from wood chips, the wood chips are put into a digester along with the cooking liquor and used for kraft cooking. Moreover, you may use for cooking of correction craft methods, such as MCC, EMCC, ITC, and Lo-solid. Also, there are no particular limitations on cooking types such as 1 vessel liquid phase type, 1 vessel gas phase / liquid phase type, 2 vessel liquid phase / gas phase type, and 2 vessel liquid phase type. That is, the step of impregnating and holding the alkaline aqueous solution of the present application may be installed separately from the conventional apparatus or part for the permeation treatment of the cooking liquid. Preferably, the unbleached pulp that has been cooked is washed with a washing device such as a diffusion washer after extracting the cooking liquor. The liquid ratio between the wood chip and the chemical solution can be, for example, 1.0 to 5.0 L / kg, preferably 1.5 to 4.5 L / kg, and more preferably 2.0 to 4.0 L / kg. .

  Moreover, in this invention, you may add the alkaline cooking liquid containing 0.01-1.5 mass% quinone compound per absolutely dry chip | tip to a digester. If the addition amount of the quinone compound is less than 0.01% by mass, the addition amount is too small to reduce the kappa number of the pulp after cooking, and the relationship between the kappa number and the pulp yield is not improved. Furthermore, the reduction of wrinkles and the suppression of the decrease in viscosity are insufficient. Moreover, even if the addition amount of a quinone compound exceeds 1.5 mass%, the further reduction of the kappa number of the pulp after cooking and the improvement of the relationship between a kappa number and a pulp yield are not recognized.

  The quinone compound used is a quinone compound, hydroquinone compound or precursor thereof as a so-called known cooking aid, and at least one compound selected from these can be used. Examples of these compounds include anthraquinone, dihydroanthraquinone (for example, 1,4-dihydroanthraquinone), tetrahydroanthraquinone (for example, 1,4,4a, 9a-tetrahydroanthraquinone, 1,2,3,4-tetrahydroanthraquinone). Methyl anthraquinone (eg 1-methyl anthraquinone, 2-methyl anthraquinone), methyl dihydroanthraquinone (eg 2-methyl-1,4-dihydroanthraquinone), methyl tetrahydroanthraquinone (eg 1-methyl-1,4,4a) , 9a-tetrahydroanthraquinone, 2-methyl-1,4,4a, 9a-tetrahydroanthraquinone) and the like, anthrahydroquinone (generally 9,10-dihydroxyanthracene), Tyranthrahydroquinone (for example, 2-methylanthrahydroquinone), dihydroanthrahydroanthraquinone (for example, 1,4-dihydro-9,10-dihydroxyanthracene) or an alkali metal salt thereof (for example, disodium salt of anthrahydroquinone, 1 , 4-dihydro-9,10-dihydroxyanthracene disodium salt), and precursors such as anthrone, anthranol, methylanthrone, and methylanthranol. These precursors have the potential to convert to quinone compounds or hydroquinone compounds under cooking conditions.

The cooking liquor preferably has an active alkali addition rate (AA) per 10% dry wood chip weight of 10 to 35% by mass. If the active alkali addition rate is less than 10% by mass, the removal of lignin and hemilulose becomes insufficient, and if it exceeds 35% by mass, the yield and quality deteriorate. Here, the active alkali addition rate is obtained by converting the total addition rate of NaOH and Na ₂ S as the addition rate of Na ₂ O, and multiplying NaOH by 0.775 and Na ₂ S by 0.795. Therefore, it can be converted into the addition rate of Na ₂ O. The degree of sulfidation is preferably in the range of 20 to 35%. In the region where the sulfidity is less than 20%, the delignification property is lowered, the pulp viscosity is lowered, and the drought rate is increased.

  Kraft cooking is preferably performed in a temperature range of 120 to 180 ° C, more preferably 140 to 160 ° C. If the temperature is too low, delignification (decrease in the kappa number) is insufficient, while if the temperature is too high, the degree of polymerization (viscosity) of cellulose decreases. The cooking time in the present invention is the time from when the cooking temperature reaches the maximum temperature until the temperature starts to decrease, and the cooking time is preferably 60 minutes or more and 600 minutes or less, and 120 minutes or more and 360 minutes or less. Is more preferable. If the cooking time is less than 60 minutes, pulping does not proceed, and if it exceeds 600 minutes, the pulp production efficiency deteriorates, which is not preferable.

  Moreover, the kraft cooking in this invention can set process temperature and process time by setting H factor (Hf) as a parameter | index. The H factor is a standard indicating the total amount of heat given to the reaction system in the cooking process, and is expressed by the following equation. The H factor is calculated by time integration from the time when chips and water are mixed until the end of cooking. The H factor is preferably 300 to 2000.

Hf = ∫exp (43.20-16113 / T) dt
[Wherein T represents an absolute temperature at a certain point]
In the present invention, the unbleached (unbleached) pulp obtained after cooking can be subjected to various treatments as necessary. For example, bleaching can be performed on unbleached pulp obtained after kraft cooking.

  The pulp obtained by kraft cooking can be subjected to oxygen delignification treatment. As the oxygen delignification used in the present invention, a known medium concentration method or high concentration method can be applied as it is. In the case of the medium concentration method, the pulp concentration is preferably 8 to 15% by mass, and in the case of the high concentration method, it is preferably performed at 20 to 35% by mass. As the alkali in oxygen delignification, sodium hydroxide and potassium hydroxide can be used. As oxygen gas, oxygen from a cryogenic separation method, oxygen from PSA (Pressure Swing Adsorption), VSA (Vacuum Swing Adsorption) Oxygen etc. from) can be used.

The reaction conditions for the oxygen delignification treatment are not particularly limited, but the oxygen pressure is 3 to 9 kg / cm ² , more preferably 4 to 7 kg / cm ² , and the alkali addition rate is 0.5 to 4 mass per pulp dry weight. %, A processing temperature of 80 to 140 ° C., a processing time of 20 to 180 minutes, and other conditions can be known. In the present invention, the oxygen delignification treatment may be performed a plurality of times. Moreover, it is preferable that the copper number of the oxygen delignification kraft pulp after performing an oxygen delignification process etc. is 5-15.

  For the purpose of further reducing the kappa number and improving the whiteness, the pulp that has been subjected to oxygen delignification treatment, for example, is then sent to the washing step, and after washing, it is sent to the multistage bleaching step, where the multistage bleaching treatment is performed. It can be carried out. The multi-stage bleaching treatment of the present invention is not particularly limited, but acid (A), chlorine dioxide (D), alkali (E), oxygen (O), hydrogen peroxide (P), ozone (Z), It is preferable to combine a known bleaching agent such as peracid and a bleaching aid. For example, the first stage of the multistage bleaching process uses a chlorine dioxide bleaching stage (D) or an ozone bleaching stage (Z), the second stage is an alkali extraction stage (E), the hydrogen peroxide stage (P), the third stage or later. A bleaching sequence using chlorine dioxide or hydrogen peroxide is preferably used. The number of stages after the third stage is not particularly limited, but considering energy efficiency, productivity, etc., it is preferable to finish in three or four stages in total. Further, a chelating agent treatment stage with ethylenediaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DTPA) or the like may be inserted during the multistage bleaching treatment.

The feed material for ruminants of the present invention is in the form of flakes, the bulk density measured according to JIS Z 7302-9 is 0.3 to 0.65 g / cm ³ , and the moisture content is 10 to 70% by mass. It is. If the bulk density is less than 0.3 g / cm ³ , transportation becomes inefficient, and if it exceeds 0.65 g / cm ³ , the pulp fiber is too tight and the processing suitability decreases. Further, if the moisture content is less than 10% by mass, the pulp fibers are too tight, and it becomes difficult to form into pellets or the like. If the moisture content exceeds 70% by mass, a large amount of water is transported during transport, which is inefficient, and the interfiber bond is weak and easily crushed, making it difficult to form a pellet or the like. The moisture content is calculated by the following equation: moisture content (mass%) = (A−B) / A (A: pulp mass before drying, B: pulp mass after absolutely dried).

  As a method of adjusting the moisture content of the pulp to 10 to 70% by mass, the pulp slurry may be squeezed by a pressure compression apparatus. Although it does not specifically limit as a pressure compression apparatus, A screw press, a filter press, a belt press, a roll press, a centrifugal dehydrator, etc. are mentioned.

  The flaky ruminant feed material of the present invention can be processed into a pellet form. When forming into a pellet, it is preferable to make a moisture content into 15-30 mass%.

  When the ruminant feed material of the present invention is compression-molded into a cube shape, it is preferable to form a cube having a length of 5 to 50 mm, a width of 5 to 50 mm and a height of 5 to 50 mm. When compression-molding into a pellet shape, it is preferable to use a cylindrical shape having a diameter of 5 to 50 mm and a length of 5 to 80 mm. An apparatus for performing compression molding is not particularly limited, but a briquetter (made by Kitagawa Iron Works), a ring die type pelletizer (made by CPM), a flat die type pelletizer (made by Dalton), and the like are desirable.

  The feed material for ruminants of the present invention or a processed product thereof can be fed to ruminants together with other feeds. Other feed ingredients include roughage (eg pasture), concentrated feed (eg corn, wheat and other grains, soybeans and other beans), bran, rice bran, okara, protein, lipid, vitamins, minerals and other additives (preservation) , Coloring agents, fragrances, etc.). These other feed ingredients may be mixed with the wood pulp during processing.

  The present invention will be described in more detail with specific examples, but the present invention is not limited to the following specific examples. In the present specification, concentration and% are based on mass unless otherwise specified, and numerical ranges are described as including the end points.

Experiment 1: Production of feed raw material using kraft pulp (Samples 1-6: LOKP)
Put a eucalyptus chip (diameter equivalent to 300 g) having a diameter (Φ) of 25.4 mm to 9.5 mm in a pressure-resistant kettle, with an active alkali addition ratio of 14%, a sulfidity of 25%, an H factor of 830, and a liquid ratio of 2.5. Kraft cooking was performed under the conditions to obtain hardwood unbleached kraft pulp (copper number: 19.4, ISO whiteness: 33.5%).
This hardwood unbleached kraft pulp is washed with tap water, adjusted to a concentration of 10%, oxygen addition rate 2.1% (per weight of dry pulp), sodium hydroxide 1.4% (per weight of dry pulp), Oxygen delignification treatment was performed at 100 ° C. for 60 minutes to obtain hardwood oxygen delignification kraft pulp (LOKP, copper number: 12.0, ISO whiteness: 52.8%).
Further, this unbleached kraft pulp was beaten with a PFI mill (manufactured by Kumagai Riki) (sample 1: Canadian standard freeness 260 ml, sample 2: Canadian standard freeness 520 ml, samples 3-6: Canadian standard drainage). Degree 610 ml).
Next, hardwood oxygen delignified kraft pulp (LOKP) having different Canadian standard freeness was centrifuged with a centrifugal dehydrator (YS-7SSA, manufactured by Iwatsuki Kikai Seisakusho Co., Ltd.). The sample was dehydrated to 8% by mass, Sample 5 was 8% by mass, and Sample 6 was 73% by mass.

(Samples 7-12: NOKP)
Chips (thickness of about 3 mm) manufactured from cedar wood were fractionated with a screening tester to obtain cedar wood chips having a diameter (Φ) of 25.4 mm to 9.5 mm. This chip (equivalent to 300g of dry) is put in a pressure-resistant kettle and kraft cooked under the conditions of 18.5% active alkali addition, 25% sulfidity, H factor 1500, liquid ratio 3.2 and unbleached craft. Pulp (kappa number: 28.2, ISO whiteness: 22.7%) was obtained.
After washing this unbleached kraft pulp with tap water and adjusting the concentration to 10%, the oxygen addition rate is 2.9% (per dry pulp weight), sodium hydroxide is 2.2% (per dry pulp weight), Oxygen delignification treatment was performed at 100 ° C. for 60 minutes to obtain coniferous oxygen delignification kraft pulp (NOKP, copper number: 12.1, ISO whiteness: 29.1%).
Further, the coniferous oxygen delignified kraft pulp was beaten with a PFI mill (manufactured by Rikuma Kumagai) (Sample 7: Canadian Standard Freeness 375 ml, Sample 8-11: Canadian Standard Freeness 460 ml, Sample 12: Canadian Standard) Freeness 650 ml).

  Subsequently, coniferous oxygen delignified kraft pulp (NOKP) having different Canadian standard freeness was centrifuged with a centrifugal dehydrator (YS-7SSA, manufactured by Iwatsuki Kikai Seisakusho Co., Ltd.). Was dehydrated to 15 mass%, sample 10 to 8 mass%, and sample 11 to 73 mass%.

<Analysis of kraft pulp>
About the kraft pulp used for each sample, the Canadian standard freeness (CSF) based on JIS P8121, the kappa number based on JISP8221, and the number average fiber length based on ISO16065-2 were measured. Moreover, the bulk density was measured based on JIS Z 7302-9.

Experiment 2: Feeding ruminants (in situ digestion test)
Digestibility in the lumen was measured by the in situ method (Journal of Dairy Science, vol. 71, pages 2051-2069, 1988, James E. Nocek).
Polyester bag (# R1020, polyester, 10 cm × 20 cm, average pore size 50 ± 15 μm, ANKOM Technology Corp) in which 5 g (air dry weight) of samples 1 to 3, 7, 8, and 12 were weighed in the lumen of the test animal (cow) , Fairport, NY, USA). At the time of 2 hours, 4 hours, 8 hours, 24 hours, 48 hours, 72 hours, and 96 hours after charging, the polyester bag was taken out from the lumen, washed with water, and the dry matter constant weight was determined at 60 ° C. Moreover, the polyester bag containing the feed which was not put into the lumen but was simply washed with water was used as a sample having a decomposition time of 0 hour. Each sample was measured in triplicate with different implementation dates.
In addition, as a control, pressed corn (sample 13: concentrated feed, Nakajima sesame industry, heat-pressed corn) and Bermudagrass hay (sample 14: roughage, Takeda, Bermuda Havel, USA) were introduced into the cattle lumen. Then, a digestion test was performed.

Experiment 3: Pellet processing suitability sample 3 (hardwood oxygen delignified kraft pulp, moisture content 30% by mass), sample 4 (same, moisture content 15% by mass), sample 5 (same, moisture content 8% by mass), sample 6 ( Same as above, moisture content 73 mass%), sample 8 (coniferous oxygen delignified kraft pulp, moisture content 30 mass%), sample 9 (same moisture content 15 mass%), sample 10 (same, moisture content 8 mass%) ), Sample 11 (the same as above, with a water content of 73% by mass) was processed with a die having a diameter of 4.8 mm and an effective thickness of 32 mm with a ring die type small pelletizer (California Pellet Mill, motor capacity 30 kW) to obtain a feed pellet. I tried processing.

<Mechanical durability test>
About the said feed pellet, the mechanical durability of the wood pellet was evaluated based on the wood pellet quality standard (Japan Wood Pellet Association, established March 31, 2011) "Mechanical durability test method". The mechanical durability of the wood pellet quality standard is standardized in accordance with the European standard EN15210-1, and relates to the dust resistance performance of the wood pellet against mechanical impact force. Specifically, the following mechanical durability (DU) was determined using a DT-T type pellet durability tester (manufactured by Sanyo Trading Co., Ltd.).
・ Mechanical durability (%) = m1 / m0 × 100
m1: Sample mass before rotation (g)
m0: Sample mass after rotation processing (g)

  The feed material of the present invention (samples 3, 4, 8, 9, 12) produced from kraft pulp having a fiber length of 1.2 mm or more is a feed material (sample 1, 4) produced from pulp having a fiber length of less than 1.2 mm. Compared with 2, 7), it was found that the time required for digestion was longer. In particular, when comparing sample 2 and sample 8, the Canadian standard freeness is almost the same, but the feed material of sample 8 with long pulp fiber length is considered to stay in the lumen for a long time and promote rumination. It was. The feed material according to the present invention is considered to contribute to the induction of rumination because it can stay in the lumen for a longer time.

  In addition, the feed raw material according to the present invention has the same final digestibility as that of the feed raw material and concentrated feed (sample 13) produced from kraft pulp having a short fiber length, and from the rough feed (sample 14). Even the final digestibility increased. Therefore, it is considered that the feed raw material according to the present invention is capable of energy conversion with high efficiency.

  Further, it was shown that samples 3 and 4 were feed raw materials excellent in pellet processing suitability compared with samples 5 and 6 or samples 8 and 9 compared with samples 10 and 11.

  As described above, according to the present invention, a feed material for ruminant animals having a high nutritional value, a slow digestion rate and capable of promoting rumination and having excellent processability can be produced.

Claims (4)

A feed material for ruminants containing kraft pulp having a number average fiber length of 1.2 mm or more measured based on ISO 16065-2, and a bulk density measured according to JIS Z 7302-9 is 0.3. A flaky ruminant feed material having a content of ˜0.65 g / cm ³ and a moisture content of 10 to 70% by mass.   The feed material for ruminants according to claim 1, wherein the kraft pulp is derived from a woody material. A method for producing a ruminant feed material containing kraft pulp having a number average fiber length of 1.2 mm or more measured based on ISO 16065-2, wherein a kraft pulp slurry having a moisture content of 90 mass% or more is added. The process of dehydrating using a pressure compression apparatus and adjusting so that the bulk density measured according to JIS Z 7302-9 may be 0.3-0.65 g / cm < ³ >, and a moisture content may be 10-70 mass%. A process for producing a flaky ruminant feed material.   The method for producing a flaky ruminant feed material according to claim 3, wherein the pressure compression apparatus is any one of a screw press, a filter press, a belt press, a roll press, and a centrifugal dehydrator.

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