饲粮peNDF对奶公牛反刍、消化、生产性能及瘤胃发酵的影响

doi:10.16431/j.cnki.1671-7236.2021.06.019

Abstract

Abstract: The experiment was conducted to investigate the effects of peNDF in the diet on ruminating,digestibility,production performance,and rumen fermentation of Holstein bulls,to provide a basis for the formulation of TMR with suitable content of peNDF in fattening bulls.30 healthy Chinese holstein bulls (no castrated) at 11 months of age and weighted 345.57 kg±23.53 kg had been selected and randomly divided into 3 groups,groupⅠ,Ⅱ,and Ⅲ,feeding peNDF_8.00 at the content of 12.40%,13.75%,and 14.85%,respectively.The results showed that the diet intake frequency of group Ⅰwas significantly higher than group Ⅱ and Ⅲ (P<0.05),while the regurgitation time and the regurgitation time per kg DM and NDF of group Ⅱ and Ⅲ was significantly higher than group Ⅰ (P<0.05).There was no significant difference in DMI,the peNDF intake,ADG,and F/G,as well as the apparent digestibility of DM,CP,NDF,ADF,Ca,and P among 3 groups (P>0.05).Group Ⅲ had the significantly higher rumen pH but the significant lower propionic acid content than the others.The acetic acid concentration,ration of acetic acid to propionic acid (A/P),and the NH₃-N concentration of group Ⅱ and Ⅲ in rumen were significantly higher than group Ⅰ (P<0.05).In the present experiment conditions,3 different peNDF_8.00 content of the diet did not affect the product performance and the apparent digestibilities of nutrients of Holstein bulls,meanwhile,feeding by the peNDF_8.00 content of 13.75% and 14.85%,the fattening Holstein bulls could have a better rumen fermentation performance with the increasing rumination time,the acetic acid concentration,A/P,and the NH₃-N concentration.

Key words: peNDF; Chinese holstein bulls; ruminant; performance; rumen fermentation

CLC Number:

S823

HAO Huaizhi, WANG Cailian, HE Zhenfu, DONG Jun, LANG Xia. Effects of peNDF in Diet on Ruminating,Digestion,Performance and Rumen Fermentation of Holstein Bulls[J]. China Animal Husbandry and Veterinary Medicine, 2021, 48(6): 2066-2073.

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Effects of peNDF in Diet on Ruminating,Digestion,Performance and Rumen Fermentation of Holstein Bulls

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