JP2018000069A - Breeding method of ruminant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology capable of lowering a moisture percentage in dung discharged from a ruminant.SOLUTION: According to the present invention, there is provided a method for lowering a dung moisture percentage of a ruminant which includes intake by the ruminant of a livestock feed containing 1-30 mass% wood pulp.SELECTED DRAWING: None

Description

  The present invention relates to a method for breeding ruminants. In particular, the present invention relates to a technique for adjusting the water content of feces discharged from ruminants.

  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 in terms of the environment.

  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 to maintain the increase in meat livestock, it is necessary to increase the feed intake, but the energy demands associated with the increase in milk yield and physique increase. This is because the rate of increase exceeds the rate of increase in the amount of ingested feed. However, carbohydrates such as starch in concentrated feed can drastically lower the pH of the rumen, 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 microorganisms increase in the rumen, and abnormal accumulation of lactic acid or volatile fatty acid (VFA) occurs, resulting in a 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 discloses pelletizing processed food residues to produce feed, and Patent Document 3 (Special Table 2013-518880) includes pelletizing lignocellulose biomass. Proposed.

  Furthermore, Patent Document 4 discloses that rumen acidosis is alleviated and fecal properties are improved by providing a feed containing neutral detergent fibers, starch and apple juice cake to a calf whose rumen is not yet developed. Yes.

JP 2011-83281 A JP-A-10-75719 International Publication WO2011-097075 JP 2013-255433 A

  In general, feces excreted from ruminants such as cows have a lot of water, and it is difficult to directly carry out processing such as composting. In particular, when a concentrated feed is given to ruminants, the excreted excreted water has a high water content. Therefore, ruminant feces must be concentrated by a press or the like, and moisture adjustment by mixing auxiliary materials (such as sawdust) is necessary, which requires a lot of cost. Especially in the summer when the environmental temperature is high, dung water becomes higher than usual, causing pests and other health problems.

  Therefore, an object of the present invention is to develop a technique for reducing the water content of feces discharged from ruminants.

  The inventors of the present invention have made extensive studies on the above problems, and found that the water content in feces can be reduced by feeding a ruminant with a feed containing wood pulp, and the present invention has been completed.

Although not limited to this, this invention includes the following aspects.
(1) A method for lowering the ruminant water content of a ruminant animal, comprising causing the ruminant animal to ingest a feed containing 1 to 30% by mass of wood pulp.
(2) A method for raising a ruminant animal, comprising feeding a ruminant animal with a feed containing 1 to 30% by mass of wood pulp and collecting feces of the ruminant animal.
(3) The method according to (1) or (2), wherein a ruminant is ingested a feed containing a concentrated feed but not containing a wood pulp before ingesting the feed containing wood pulp.
(4) Compared with the dung water content at the time when the feed containing no wood pulp was ingested, the dung water content at the time when the feed containing wood pulp was ingested was lower by 1% or more, (3) The method described in 1.
(5) The method according to any one of (1) to (4), wherein the water content of feces is 75 to 87% when the feed containing wood pulp is ingested.
(6) The method according to any one of (1) to (5), wherein the ruminant is a cow.
(7) The method according to any one of (1) to (6), wherein the wood pulp is kraft pulp.
(8) The method according to any one of (1) to (7), wherein the wood pulp has a copper number of 5 or more.
(9) The method according to any one of (1) to (8), wherein the wood pulp is an oxygen delignified pulp.
(10) The method according to any one of (1) to (9), wherein the wood pulp is oxygen delignified kraft pulp obtained by subjecting unbleached kraft pulp to oxygen delignification, and the copper value is 5 to 15.

  According to the present invention, it is possible to reduce the moisture content of feces discharged from ruminants such as cows. Therefore, according to the present invention, it is possible to reduce labor and cost required for processing required for producing compost and the like.

  The present invention reduces ruminant water content of ruminants by feeding ruminants with feed containing 1-30% by weight of wood pulp. The present invention is preferably applied to a ruminant who is ingesting a feed containing a concentrated feed but not containing wood pulp before ingesting a feed containing 1 to 30% by mass of wood pulp. Moreover, it is preferable that the water content of feces at the time of ingesting the feed containing wood pulp is 1% or more lower than the water content of feces at the time of ingesting the feed without wood pulp.

  The ruminant feed of the present invention is applied to ruminants. Examples of ruminants include cows such as dairy cows and fattening cows, sheep, and goats. When the feed of the present invention is fed to ruminants, there are no particular restrictions on the age, physique, health status, etc. of the ruminant to which the feed is applied, and for example, it can be used from calves in adulthood to adult cattle.

  The feed of the present invention contains wood pulp, which is a wood-derived pulp, but preferably contains 1 to 30% by mass of wood pulp, more preferably 2 to 25% by mass, based on dry matter. It is more preferable to contain 20% by mass.

  Although the feed of this invention contains a wood pulp, the pulp manufactured by the well-known pulping method can be used without a restriction | limiting. 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. Further, a pulp having a kappa number of 5 to 15 or a kraft pulp is more preferable, and an oxygen delignified kraft pulp having a kappa number of 5 to 15 is particularly preferable.

  In the ruminant feed of the present invention, the pulp may be composed of one kind or a mixture of a plurality of pulps. For example, chemical pulps (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.

  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, neko, spruce, iramimi, fir, sawara, togasawara, asunaro, hiba, tsuga, kotsutsuga, hinoki, yew, yellowtail, 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.

When producing kraft pulp from kraft pulp 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. When the active alkali addition rate is less than 10% by mass, removal of lignin and hemilulose becomes insufficient, and when it exceeds 35% by mass, the yield and quality are degraded. 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 representing the total amount of heat given to the reaction system during the cooking process, and is represented 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 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.

Preparation and Feeding of Feed The feed of the present invention may be prepared by combining wood pulp with other feed ingredients, and the prepared blended feed can be fed to ruminants. 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.).

  When the concentrated feed is blended with the feed of the present invention, for example, grains such as corn, wheat, barley, and polished rice can be used. In the feed of the present invention, for example, grains such as rice, wheat, barley, oats, milo, corn and the like can be used as the main starch source.

  In this invention, it is preferable to mix | blend roughage at a fixed level, for example, it is preferable to contain 5-50 mass% in conversion of a dry matter, It is more preferable to contain 15-48 mass%, It is good also as 25-45 mass%. . As raw materials for roughage, for example, soybean, soybean meal (including soybean meal that has been subjected to sweetened heat treatment or humidified heat treatment), rapeseed meal, flaxseed meal, corn gluten meal, concentrated soybean protein, wheat gluten, wheat gluten enzyme Decomposed products can be mentioned. In particular, soybean-derived crude protein feedstock such as soybean meal (excluding those that have been subjected to sweetened heat treatment or humidified heat treatment) increases the digestibility of fibers in the lumen by feeding a large amount of soluble protein, In order to suppress the excessive increase in the content of crude fat in the feed due to the viewpoint of improving the growth of calves and the blending of NDF feedstock with a relatively high content of crude fat such as DDGS, feed It is preferable to blend in.

  In the present invention, saccharides may be added to the feed. For example, glucose, fructose, sucrose, lactose, maltose, and the like can be suitably added.

  In addition to the above-mentioned raw materials, the feed of the present invention is a flavoring material, minerals, vitamins, organic minerals, grass, grass plant feed materials, crystalline amino acids, fats and oils, fatty acids, fatty acid calcium, adsorbents, minerals, plants It may contain extracts, fermented products, flavorings, organic acids, antibiotics, animal feed, microbial components, herbal medicines, enzyme agents, oligosaccharides, woody feeds, binding agents, other plant processing by-products, etc. .

  Examples of pasture include orchardgrass, timothy, oat hay, alfalfa, italian ryegrass, red clover, etc. Examples of feed ingredients derived from grasses include sorghum, wheat straw, rice straw, etc. Can be mentioned. However, feed materials derived from grass and grasses are not easy to digest, for example, for calves younger than 3 months of age, so supply as roughage as needed to stimulate the stomach wall of the rumen, The calf feed of the present invention is preferably not contained or, if included, a small amount.

  In a preferred embodiment, wood pulp and other feed ingredients may be compression molded to form a pellet. The feed used in combination with the feed pellets of the present invention may be in the form of pulp, powder, or fluff, but it may be compressed into a cube or pellet, or cut into a sheet form, This is preferable because it can be easily mixed with other feeds such as grass and can be easily transported and handled.

  When compression-molding into a cube shape, it is preferable to use 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 × 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.

When setting it as a sheet form, it is preferable to set it as a sheet piece of 5-50 mm x 5-50 mm with a basic weight of 300-2000 g / m < ² >.

  The ruminant feed of the present invention preferably has a moisture content of 15% or less. By making the moisture content 15% or less, the transportability is improved and the decay by microorganisms can be reduced. The water content of the feed may be, for example, 1% by mass or more, and may be adjusted to 5% by mass or more.

  The ruminant feed of the present invention can have, for example, a total digestible nutrient (TDN) of 50-95%, but may be 60-85%, or even 65-80%. Crude protein (CP: Crude Protein) can be 5-40%, for example, but it is good also as 10-30%, Furthermore, it is good also as 13-25%.

  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 containing wood pulp Based on the formulation shown in the table below, feeds used in the control group and the test group were prepared. The feed of the control plot and the feed of the test plot (hardwood kraft pulp blended with 10% by dry weight) were blended so that the total digestible nutrient content (TDN) and crude protein (CP) in the dry matter were almost the same (TDN) : About 71 kg, CP: about 13 kg).

(Roughage)
・ Corn silage (in-house production at Kyushu Okinawa Agricultural Research Center)
・ Italian wrap silage (in-house production at Kyushu Okinawa Agricultural Research Center)
(Thick feed)
・ Corn (purchased from Kumamoto Dairyen and Livestock Federation)
・ Soybean cake (purchased from Kumamoto Dairyen and Livestock Federation)
・ Formulated feed (Kumamoto Dairyen, Kumadai P & F74C)
-Wood pulp Eucalyptus chips were subjected to kraft cooking with an active alkali addition rate of 16.0%, a sulfidity of 25%, and an H factor of 800 to obtain unbleached kraft pulp (kappa number: 21.1, ISO whiteness: 24 .8%).
After washing the unbleached kraft pulp with tap water to a concentration of 10%, the oxygen addition rate is 2.1% (per weight of dry pulp), sodium hydroxide is 1.4% (per weight of dry pulp), 100 ° C. The oxygen delignification treatment was performed in 60 minutes to obtain oxygen delignification kraft pulp (kappa number: 8.6, ISO whiteness: 47.3%).
The obtained oxygen delignified kraft pulp was washed with tap water and then dehydrated with a screw press (SHX-200 type, manufactured by Togoku Industry) to adjust the moisture content to 28.8% by mass.

(Additive)
・ Calcium phosphate for feed (Onoda Chemical Co., Ltd.)
・ Calcium carbonate for feed (made by Iida Kogyo)
・ Salt for feed (made by Dia Salt)

Experiment 2: Feeding test for ruminant animals The fed diet prepared in Experiment 1 was fed to 14 lactating cows at Kyushu Okinawa Agricultural Research Center (Koshi City, Kumamoto Prefecture). The test was carried out from the end of May. First, the mixed feed of the control group was fed, and then the mixed feed of the test group was fed for 2 weeks. The details of lactating cows fed mixed feed are as follows. In general, cows gradually increase their milk yield after parturition and reach the peak milk volume in about 3 months after the start of lactation.

In this experiment, rectal feces were collected from the anus of lactating cows, and the water content of the collected rectal feces was measured. Specifically, the collected rectal fecal sample (about 50 grams) is dried at 55 ° C. for 3 to 4 days, and when the weight does not change even after half a day or more, it is regarded as the dry weight. The water content of rectal feces was calculated.
Rectal fecal water content (%) = (feces weight before drying-feces weight after drying) / feces weight before drying × 100

  As shown in the table, the water content of rectal feces (average value of 14 heads) in the control group (before feeding the pulp-containing feed) was 87.6 ± 1.1%, while 2 after feeding the pulp-containing feed. The water content of rectal feces at the weekly stage was 85.3 ± 1.7%, and the water content of feces could be significantly reduced by the present invention (p <0.05).

Claims (10)

  A method for reducing ruminant water content in ruminants, comprising causing ruminants to ingest feed containing 1 to 30% by weight of wood pulp. Feeding a ruminant with a feed containing 1-30% by weight of wood pulp;
Collecting ruminant feces,
A method for raising ruminants, including   The method according to claim 1 or 2, wherein the ruminant is ingested a feed containing a concentrated feed but no wood pulp before ingesting the feed containing wood pulp.   The fecal water content at the time of ingesting the feed containing wood pulp is 1% or more lower than the fecal water content at the time of ingesting the feed that does not contain wood pulp. Method.   The method in any one of Claims 1-4 whose feces moisture rate at the time of ingesting the said feed containing a wood pulp is 75 to 87%.   The method according to any one of claims 1 to 5, wherein the ruminant is a cow.   The method according to claim 1, wherein the wood pulp is kraft pulp.   The method according to claim 1, wherein the wood pulp has a copper number of 5 or more.   The method according to claim 1, wherein the wood pulp is an oxygen delignified pulp.   The method according to any one of claims 1 to 9, wherein the wood pulp is oxygen delignified kraft pulp obtained by subjecting unbleached kraft pulp to oxygen delignification, and has a kappa number of 5 to 15.