THE EFFECT OF DIETARY INCLUSION OF YEAST CULTURE ON DIGESTION IN THE SHEEP
THE EFFECT OF DIETARY INCLUSION OF YEAST CULTURE ON DIGESTION IN THE SHEEP
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DOI：
10.1017/s0003356100004967
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发表时间：
1990-06-01
影响因子：
--
通讯作者：
OFFER, NW
中科院分区：
文献类型：
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作者：
CHADEMANA, I;OFFER, NW
六只成年羊，每只都装有瘤胃插管，在 6 次中被分配到 6 种饮食。 6 拉丁方设计实验，检查酵母培养物对瘤胃代谢、瘤胃液体流出率、瘤胃中纤维消化和总体营养物质消化率的影响。酵母培养物（YC）是一种商业产品，由酵母（酿酒酵母）和其生长和干燥以保持其发酵能力的培养基组成。六种饮食治疗是三种不同干草干物质（DM）：浓缩DM比例（分别为低、中和高浓缩物为90:10、65:35和40:60）的饮食，每种饮食不添加或添加4克/天的YC。治疗周期为3周。饲粮精料比对瘤胃功能有显着影响（P < 0.05）。 YC的加入对瘤胃pH值、瘤胃液体流出率、瘤胃氨浓度、总挥发性脂肪酸浓度以及乙酸、丙酸和丁酸的摩尔比例没有显着影响(P < 0.05)。补充 YC 不会影响体内测量的有机物、中性洗涤纤维或总能量的总体营养消化率。然而，在每种草料：精料比例下，YC 都会增加在瘤胃中培养 24 小时的尼龙袋中干草有机物的消失量（P < 0.05）。含和不含 YC 的低浓度日粮的值分别为 0.482 和 0.432，中浓度日粮的值为 0.423 和 0.366，高浓度日粮的值为 0.360 和 0.321。然而，当袋子孵育 48 小时时，YC 对干草消失没有影响。 YC 似乎提高了瘤胃中草料消化的初始速率，而不改变总体食物消化率或发酵最终产品的生产模式。
Six mature sheep, each fitted with a rumen cannula, were assigned to six diets in a 6 .times. 6 Latin-square design experiment to examine the effects of a yeast culture on ruminal metabolism, rumen liquid outflow rate, fibre digestion in the rumen and overall nutrient digestibility. The yeast culture (YC) was a commercial product composed of a yeast (Saccharomyces cerevisae) and the media on which it grew and dried so as to maintain its fermentative capacity. The six dietary treatments were three diets differing in hay dry matter (DM):concentrate DM ratio (90:10, 65:35 and 40:60 designated low, medium and high concentrate respectively) each given either without or with a supplement of 4 g/day of YC. Treatment periods were of 3 weeks duration. There were significant effects of dietary forage:concentrate ratio on rumen function (P < 0.05). Rumen pH, rumen liquid outflow rate, rumen ammonia concentration, total volatile fatty acids concentration, and molar proportions of acetate, propionate and butyrate were not significantly affected by the inclusion of YC (P < 0.05). Supplemental YC did not affect the overall nutrient digestibility of organic matter, neutral-detergent fibre or gross energy measured in vivo. However, at every forage:concentrate ratio, YC increased the disappearance of hay organic matter from nylon bags incubated in the rumen for 24 h (P < 0.05). The values with and without YC were 0.482 and 0.432 for the low, 0.423 and 0.366 for the medium, and 0.360 and 0.321 for the high concentrate diets respectively. However, YC had no effect on hay disappearance when bags were incubated for 48 h. YC appeared to increase the initial rate of forage digestion in the rumen without altering overall food digestibility or the pattern of production of fermentation end products.