不同CBI日粮对牦牛瘤胃发酵参数、血清生化指标和养分消化率的影响

本试验旨在探究不同碳水化合物平衡指数(Carbohydrate balance index,CBI)日粮对牦牛瘤胃发酵参数、血清生化指标和养分消化率的影响,选取3种不同CBI(1.17,2.45,5.67)日粮,采用3×3拉丁方试验设计,通过一系列指标测定,明确牦牛最优日粮CBI水平。结果表明：不同CBI牦牛日粮瘤胃发酵参数均不显著;CBI=1.17与CBI=5.67牦牛日粮的白蛋白/球蛋白差异不显著,但均显著高于CBI=2.45的牦牛日粮(P<0.05);CBI=2.45牦牛日粮干物质消化率、蛋白质消化率显著高于CBI=1.17和CBI=5.67(P<0.05);CBI=2.45与CBI=5.67牦牛日粮的中性洗涤纤维消化率差异不显著,但均显著高于CBI=1.17(P<0.05)。综上所述：牦牛日粮的CBI=2.45更有利于其瘤胃发酵和养分消化利用。

Effects of Different CBI Diets on Rumen Fermentation Parameters,Serum Biochemical Indices and Nutrient Digestibility of Yak

This study aimed to explore the different carbohydrate balance index (CBI) of diets on rumen fermentation parameters,serum biochemical parameters and nutrient digestibility in yak. Three different CBI (1.17,2.45,5.67) diets were selected,and the 3×3 Latin square test design was adopted,a series of indicators were measured to clarify the optimal CBI level of the yak. There were no differences in ruminal fermentation parameters of different CBI yak diets. There was no difference in albumin/globulin between CBI=1.17 and CBI=5.67, but they were significantly higher than that of CBI=2.45 yak diets (P<0.05).The results showed:dry matter digestibility of CBI=2.45 yak diet and crude protein digestibility were significantly higher than that of CBI=1.17 and CBI=5.67 yak diet;there was no difference in neutral detergent fiber digestibility of CBI=2.45 and CBI=5.67 yak diet,they were significantly higher than that of the yak diet with CBI=0.49;there were no differences in ether extract digestibility,acid detergent fiber digestibility and starch digestibility of different CBI diets. In summary, it is more conducive to rumen fermentation and nutrient digestion and utilization when the CBI of the yak diet is 2.45.