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RISS 인기검색어
- 검색키워드
- 저자 : Emerick, R J (검색결과 5 건)
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Buffer 제의 급여가 면양의 반추위액 및 혈액성상에 미치는 영향
하종규,Emerick, R J 한국축산학회 1984 한국축산학회지 Vol.26 No.8
An experiment using a double 4 × 4 Latin square design was conducted to study the effects of NaHCO₃, limestone, and bentonite at 2% levels on feed intake, rumen fermentation, and blood mineral concentrations of canulated lambs changed abruptly from brome hay to a 92% concentrate diet followed by a 7-day feeding period. Although slight benefits regarding feed intake and maintenance of rumen pH were obtained by adding NaHCO₃ to the high-concentrate diet, buffers generally did not prevent the acidosis-related changes in rumen lactic acid, VFA, or plasma mineral concentrations occurring after high-concentrate feeding.
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Buffer 제와 알팔파건초의 첨가가 고농후사료를 섭취한 면양의 반추위액의 성상 및 체내대사에 미치는 영향
하종규 ( Jong Kyu Ha,R . J . Emerick,L . B . Embry ) 한국축산학회 1985 한국축산학회지 Vol.27 No.2
Lambs weighing an average of 35 ㎏ were housed in metabolism cages to study the effects of bentonite, limestone, and NaHCO₃ at 2% levels and alfalfa hay at a 10% level added to all-concentrate lamb diets. Ruminal and systemic parameters were measured during the. onset of acidosis (phase 1). The effects of these buffering materials (alfalfa omitted) on ration digestibility and mineral retention in addition to the ruminal and systemic parameters were investigated under the same conditions following a 20-day adaptation period (phase 2). Adding buffers or alfalfa hay was effective in maintaining a more normal ruminal pH and in preventing lactate accumulation in the rumen. On the third day (phase 1) of high-concentrate feeding, most animals drastically reduced feed consumption, but lambs fed NaHCO₃ or alfalfa hay consumed the entire rations given on day 3. Urinary lactate generally followed the trend observed in rumen samples, and feeding buffers or alfalfa tended to reduce urinary lactate excretion. Lambs fed NaHCO₃ excreted higher (P$lt;.01) Na at days 2 and 3 and those fed bentonite excreted more (P$lt;.05) Ca than those fed control diet at day 3. Other parameters including water intake, urine volume, ruminal mineral concentrations, blood PCV, and plasma lactate were unaffected by treatment. In phase 2, the dietary buffers did not influence rumen pH, lactate, total VFA, individual VFA molar percentages, or mineral concentrations except K which was lower (P$lt;.01) in lambs fed 2% bentonite. No obvious effects due to buffers were observed on PCV, plasma lactate, or mineral concentrations. NaHCO₃ increased urine pH (P$lt;.01) and urine lactate (P$lt;.05). Lambs fed 2% NaHCO₃ digested. more (P$lt;.05) dry matter, crude protein, nitrogen-free extract, and starch, and 2% limestone increased (P$lt;.05) fiber digestibility. 1Dietary buffers generally reduced percent fecal starch and improved starch digestibility. Distinctive improvement (P$lt;.05) in starch digestibility was obtained by feeding NaHCO₃. Higher (P$lt;.05) Mg retention was obtained by feeding 2% bentonite or NaHCO₃. More (P$lt;.01) Ca was retained by limestone-fed lambs and more (P$lt;.01) Na by NaHCO₃-fed lambs, but percent retention was not different from the control.
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Bentonite 와 Limestone 이 면양의 증체와 혈장 무기물함량 변화에 미치는 영향
하종규 ( Jong Kyu Ha,R . J . Emerick,L . B . Embry ) 한국축산학회 1985 한국축산학회지 Vol.27 No.1
Two hundred lambs were employed to study the effects of 2% bentonite, 2% limestone, and 1% bentonite + 1% limestone on the feedlot performance of lambs rapidly switched from alfalfa hay to 8% alfalfa hay plus 92% concentrate diets. Lambs receiving 2% bentonite or 2% limestone showed a slight improvement in feedlot performance during the initial 21 days, but the benefit was not sustained in the remaining feeding period. Those fed the combination of bentonite and limestone tended to show poor weight gain and feed efficiency compared to the control group. Lambs fed 2% bentonite had higher (P$lt;.01) plasma Mg concentrations at day 59. Those receiving 2% limestone had higher Na (P$lt;.01) and K (P$lt;.05) at day 3. Blood samples from 2% bentonite + 2% limestone-fed lambs showed higher (P$lt;.01) plasma Na and K, lower (P$lt;.05) PCV at day 3, and lower (P$lt;.05) plasma Ca and Mg, and PCV at day 59. Increased plasma Na (P$lt;.01), K (P$lt;.01), K (P$lt;.01), and P (P$lt;.0.5) and decreased (P$lt;.OS) PCV at day 3 were obtained by feeding 1% bentonite + 1% limestone.
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하종규 ( Jong Kyu Ha,R . J . Emerick,L . B . Embry ) 한국축산학회 1985 한국축산학회지 Vol.27 No.1
A study involving 96 lambs was conducted to investigate the role of alfalfa and brome hay at 10% levels in alleviating acidosis after sudden dietary change from roughage to concentrate. Feeding alfalfa or biome hay at 10% levels reduced the death loss from 72% of control to 31% of those fed the 10% hay diets. Both roughages tended to increase rumen pH and increased plasma concentrations of Na (P$lt;0.01) and K (P$lt;0.05). Alfalfa increased (P$lt;0.05) concentration of ruminal lactate, but the roughages had no effect on VFA concentrations.
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