日粮添加酵母培养物对山羊瘤胃发酵参数和十二指肠氨基酸流量的影响

The Effect of Dietary Supplementation of Yeast Culture on Rumen Fermentation Parameters and Duodenal Flow of Amino Acid in Growing Goats

为考察日粮添加益康XP和酵母培养物(YC)对山羊瘤胃发酵参数和十二指肠氨基酸(AA)流量的影响,采用3×3拉丁方试验设计,选用3头装有永久性瘤胃瘘管和十二指肠瘘管的健康湘东黑山羊(平均体重为(15±2.5)kg)为试验动物,饲喂同一种基础日粮以及分别添加0.25%益康XP和YC的试验日粮。结果表明,日粮添加益康XP有降低瘤胃pH值和NH3-N浓度的趋势;而添加YC有增加瘤胃pH值和NH3-N浓度的趋势;添加益康XP和YC日粮,瘤胃TVFA含量分别下降20.61%和3.98%(P>0.05),而对瘤胃内TVFA、各单个VFA含量及其所占比例、乙酸/丙酸均无显著影响(P>0.05)。添加益康XP和YC对山羊十二指肠AA流量无显著影响(P>0.05),采食添加YC饲粮的山羊十二指肠AA流量高于采食添加益康XP饲粮的山羊。结果显示,YC对于调节山羊瘤胃发酵、增加过瘤胃蛋白含量有一定的积极作用。

This experiment was conducted to study the effect of dietary supplementation of Yikang XP and yeast culture（YC）on rumen fermentation parameters and duodenal flow of amino acid（AA）in growing goats.Three goats（（15±2.5）kg）were fitted with ruminal and duodenal cannulae and allocated to three dietary treatments in a 3×3 Latin square design.The goats were fed a same basic ration and supplemented with Yikang XP and YC both at 0.25% level.The results showed that there was an increasing tendency of ruminal pH value and NH3-N concentration when supplemented with YC,and a decreasing tendency of ruminal pH value and NH3-N concentration was observed when supplemented with Yikang XP.The content of total volatile fatty acid（TVFA）decreased by 20.61% and 3.98%（P0.05）when supplemented with Yikang XP and YC,respectively.There were no significantly（P0.05）differences of the content of TVFA,individual VFA content and its ratio,and the ratio of acetic acid to propionate acid when supplemented with Yikang XP and YC.The dietary supplementation of Yikang XP and YC did not affect（P0.05）the duodenal flow of AA,the duodenal flow of AA for the YC treatment was higher than that for the Yikang XP treatment.In conclusion,the dietary supplementation of YC had positive effects on regulation of rumen fermentation and promotion of rumen microbial protein synthesis.