Quigley J D, Smith Z P, Heitmann R N
Department of Animal Science, University of Tennessee, Knoxville 37901.
J Dairy Sci. 1991 Jan;74(1):258-63. doi: 10.3168/jds.S0022-0302(91)78168-X.
Effects of weaning age on plasma VFA were examined using 16 Holstein heifer calves. Animals entered the study at 6 +/- 3.5 d of age and were fed 1.8 kg milk twice daily to 28 (early weaning) or 56 d (late weaning) and a commercial pelleted calf starter from 0 (early) or 28 (late) d. Blood was sampled once weekly for 14 wk. Total blood concentrations of VFA, acetate, propionate, and butyrate were higher in calves weaned early. Difference between treatments was greatest during wk 5 to 8, after early calves had been weaned. Total VFA and acetate were both highly correlated with grain intake (r = .77), whereas propionate (r = .47) and butyrate (r = .56) were less highly correlated. Data indicate that blood VFA responded rapidly to dry feed intake, and adaptation to high grain diets was complete by 1 to 2 wk postweaning.
使用16头荷斯坦小母牛犊牛研究断奶年龄对血浆挥发性脂肪酸（VFA）的影响。动物在6±3.5日龄时进入研究，每天两次饲喂1.8千克牛奶至28日龄（早期断奶）或56日龄（晚期断奶），并从0日龄（早期）或28日龄（晚期）开始饲喂商业颗粒状犊牛开食料。每周采血一次，持续14周。早期断奶的犊牛血浆中VFA、乙酸、丙酸和丁酸的总浓度较高。在早期断奶的犊牛断奶后的第5至8周，处理之间的差异最大。总VFA和乙酸均与谷物摄入量高度相关（r = 0.77），而丙酸（r = 0.47）和丁酸（r = 0.56）的相关性较低。数据表明，血浆VFA对干饲料摄入量反应迅速，断奶后1至2周对高谷物日粮的适应完成。
