JP2018007635A - How to feed ruminants - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a breeding technique that can maintain a sound state of pH in the rumen of a ruminant.SOLUTION: A ruminant is made to take feed containing 1-15 mass% of wood pulp, daily for a period of 3 days or longer, which can maintain a sound state of pH in a first rumen juice from the rumen of a ruminant.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for breeding ruminants. In particular, the present invention relates to a method for breeding ruminants that can prevent rumen pH in rumen from becoming too low and prevent subacute acidosis.

  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 may rapidly lower the pH of rumen, and as a result, rumen acidosis may occur (Non-patent Document 1). Rumen acidosis is a type of ruminant disease caused by rapid intake of carbohydrate-rich cereals, concentrates, fruits, and the like.

  As feed for improving or maintaining milk fat, Patent Document 1 contains soy sauce in a feed containing soy sauce, Patent Document 2 contains cottonseed in the feed, and Patent Document 3 shows sodium. It has been proposed to feed antacids or magnesium antacids.

  On the other hand, as a feed for preventing rumen acidosis, Patent Document 4 discloses a livestock feed obtained by pulverizing and pulverizing woody raw materials with a high impact force. Moreover, regarding the pelletized feed, Patent Document 5 discloses pelletizing processed food residues to produce feed, and Patent Document 6 (Special Table 2013-518880) includes pelletizing lignocellulose biomass. Proposed. Furthermore, Patent Document 7 discloses that rumen acidosis is alleviated and fecal properties are improved by feeding a feed containing neutral detergent fibers, starch and apple juice cake to a calf whose rumen is not yet developed. Yes.

JP 2006-141312 A JP-A-5-41953 JP-A-2-35047 JP 2011-83281 A JP-A-10-75719 International Publication WO2011-097075 JP 2013-255433 A

"Dynamics of rumen microorganisms in subacute acidosis", Journal of the Japan Society of Animal and Beast, 65, 503-510, 2012

  In recent years, the occurrence of subacute ruminal acidosis (SARA) in ruminants has become a problem due to heavy feeding and inappropriate feeding management aimed at improving productivity. .

  SARA exhibits prominent clinical symptoms in ruminants such as dairy cows and fattening cows when the rumen pH is about 5.2 to 5.6 or less and continues for at least 3 hours / day It is a potential production disease that can occur without any loss, and its economic wear is extremely high. In the United States, SARA has been identified in up to 26% of lactating cows in mid-lactation, with economic losses estimated to be between $ 500 million and $ 1 billion (Jorg MD Enemark, The Veterinary Jounal, vol. 176, pages 32-43, 2008). In Japan, the prevention of SARA in cattle is an urgent issue.

  Therefore, an object of the present invention is to develop a breeding technique that can maintain rumen pH in ruminants in a healthy state and prevent SARA.

  The inventors of the present invention have intensively studied the above problems, and found that the rumen pH of ruminant can be maintained at more than 5.6 by feeding the ruminant with feed containing wood pulp, and the present invention has been completed. I came to let you.

Although not limited to this, this invention includes the following aspects.
(1) To ruminants for suppressing the pH of the first gastric juice to be 5.6 or less, including allowing ruminants to ingest feed containing 1 to 15% by mass of wood pulp for 3 days or more. Feeding method.
(2) After ingesting the feed for 3 days or more, the time during which the pH of the rumen fluid in rumen of ruminant is 5.6 or less is less than 3 hours in total per day, (1) Method.
(3) The method according to (1) or (2), further comprising monitoring the pH of the first gastric juice with a wireless transmission pH sensor placed in the rumen of the ruminant.
(4) The method according to any one of (1) to (3), wherein the feed is ingested for 8 days or more.
(5) The method according to any one of (1) to (4), wherein the ruminant is a cow.
(6) The method according to any one of (1) to (5), wherein the wood pulp is kraft pulp.
(7) The method according to any one of (1) to (6), wherein the wood pulp is an oxygen delignified pulp.
(8) The method according to any one of (1) to (7), wherein the wood pulp is wood pulp obtained by subjecting unbleached kraft pulp to oxygen delignification, and the copper value is 5 to 15.

  According to the method of the present invention, the rumen pH of ruminants such as cows can be maintained in a healthy state.

FIG. 1 is a bar graph showing the accumulated time of the pH in the first stomach in Experiment 2 (average from day 12 to day 14). The horizontal axis represents pH, and the vertical axis represents integration time (h) (left: control group, right: test group). FIG. 2 is a graph showing the time course of the pH in the rumen in Experiment 2 (1-14 days: control group, 15-28 days: test group). The horizontal axis is the number of days elapsed (day), and the vertical axis is the pH in the first stomach.

  The present invention maintains rumen pH in ruminants in a healthy state by allowing ruminants to ingest feed containing 1-15% by weight of wood pulp for 3 days or more. 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 15% by mass of wood pulp. According to the present invention, after the feed is ingested for 3 days or more, the time during which the pH of the rumen fluid in the rumen of ruminant is 5.6 or less can be reduced to less than 3 hours per day.

  The rumen pH in ruminants can be measured, for example, by oral sampling using a catheter or the like, a first gastric puncture method using a puncture needle, or a method using a wireless pH sensor. In the present invention, since the measurement error is small and the burden on the ruminant is small, it is preferable to monitor the pH in the lumen with a wireless pH sensor.

  According to the present invention, the time during which the pH of the first gastric juice in the ruminant rumen lumen is 5.6 or less can be reduced to less than 3 hours per day, but the pH of the first gastric juice is 5.6 or more. Can also be maintained.

  The present invention applies 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 period for feeding the feed of the present invention is fed daily for at least 3 days, but in a preferred embodiment, it is preferably fed daily for 8 days or more, and further for 12 days or more.

  The feed of the present invention contains wood pulp, which is a wood-derived pulp, but preferably contains 1 to 15% by mass of wood pulp, more preferably 1.5 to 10% by mass, based on dry matter. You may make it contain 2-8 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. 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 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 water content of 15% by mass or less. By making the water content 15% by mass 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 group and the feed of the test group were blended so that the total digestible nutrient amount (TDN), crude protein (CP), and coarse feed ratio in the dry matter were approximately the same (TDN: about 75.0%, CP: About 14.6%, roughage ratio: about 40%). Wood kraft pulp (TDN: 90% or more) was replaced with corn compact because it was TDN equivalent to corn compact.

(Roughage)
・ Corn silage (in-house production at the Miyazaki Prefectural Livestock Experiment Station)
・ Italian ryegrass silage (in-house production in Miyazaki Prefectural Livestock Experiment Station)
・ Lusan Hay (American, purchased from Kyushu Nosan Trading, Alphabale Pride)
・ Otsuhei (Australia, Yamae Kuno Co., Ltd., feed livestock Minami Kyushu branch)

(Thick feed)
・ Corn press (Nakajima Seiya Kogyo, heated pressure corn)
・ Barley pressed pieces (Nakajima Seiya Kogyo, peeled pressed barley)
・ Soybean cake (Kato Oil Refinery, soybean cake flakes)
・ Bran (Japanese flour, fine bran)
・ Wood kraft pulp Domestic hardwood chips were subjected to kraft cooking with an active alkali addition rate of 16.0%, sulfidity of 25% and H factor 800 to obtain unbleached kraft pulp (kappa number: 18.2, ISO) Whiteness: 29.0%).
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: 8.5, ISO whiteness: 48.0%).
The obtained oxygen delignified kraft pulp was washed with tap water and then dehydrated with a screw press (SHX-200 type, manufactured by Togoku Kogyo) to adjust the moisture content to 29.9% by mass.
(Additive)
・ Calcium carbonate (Shirounkite Industry)
・ Vitamin preparation (for DSM Nutrition Japan, Vita-Fuck dairy cow)

Experiment 2: Feeding test for ruminants Feeding tests were conducted using 4 milked cows (Holstein, production: 1 production, average milking days: 194 ± 40 days). The test was conducted in Japan from September to October by the crossover method in which two test plots and two test plots (hereinafter also referred to as pulp plots) were exchanged in one period of 14 days.

  Specifically, two animals were fed the control diet for 14 days, and the remaining 2 animals were fed the test diet for 14 days. From the 15th day, two cows that had been fed the control feed were fed the test feed, and the cows that were fed the test feed were fed the control feed until the 28th day. did. A sufficient amount of the feed prepared in Experiment 1 was given once a day (satiated). Regarding the pH of bovine rumen fluid, a wireless transmission pH sensor (manufactured by Yamagata Toa DKK, 30 mm × 145 mm) was orally administered, and the pH in the rumen was measured every 10 minutes. That is, it was described in "Study on diagnosis and control of subacute rumen acidosis in dairy cows using wireless transmission pH sensor" (Kimura Jun, Iwajukaiho, Vol. 39, pp. 51-56, 2013). Thus, the data from the pH sensor placed in the first stomach was received by the receiver, and the data was processed by the computer to calculate the integrated pH time per day.

  Table 2 shows data for each day regarding the integrated time of the first stomach pH, and FIG. 2 shows a graph regarding the integrated time of the first stomach pH (average value on the 12th to 14th days). As is clear from the experimental results, in the control group, the time during which the pH in the rumen was 5.6 or less was 7 hours or more per day, whereas in the test group (pulp group), the pH in the rumen 1 There was almost no time for 5.6 or less.

  Moreover, the graph which shows the time-dependent change of pH in a 1st stomach is shown in FIG. 2 about the dairy cow which fed the mixed feed of the control plot for 14 days, and then fed the mixed feed of the test plot for 14 days. As is clear from FIG. 2, the fluctuation in the rumen pH in the test group (15 to 28 days) is smaller than that in the control group (1 to 14 days). Could be stabilized in the range of 6-7.

  Thus, it has been confirmed that the rumen pH of ruminants can be maintained in a healthy state by the feeding method of the present invention, and according to the present invention, SARA can be effectively prevented.

Claims (8)

  A method for feeding a ruminant animal for suppressing the pH of the first gastric fluid to be 5.6 or less, comprising allowing the ruminant animal to ingest a feed containing 1 to 15% by mass of wood pulp for 3 days or more.   The method according to claim 1, wherein after the feed is ingested for 3 days or more, the time during which the pH of the rumen fluid in the rumen of ruminant is 5.6 or less is less than 3 hours in total per day.   The method according to claim 1 or 2, further comprising monitoring the pH of the first gastric juice with a wireless transmission pH sensor placed in the rumen of the ruminant.   The method according to claim 1, wherein the feed is ingested for 8 days or more.   The method according to any one of claims 1 to 4, 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 is an oxygen delignified pulp.   The method according to any one of claims 1 to 7, wherein the wood pulp is a wood pulp obtained by subjecting unbleached kraft pulp to an oxygen delignification treatment, and a kappa number of 5 to 15.