Ahunu B K, Arthur P F, Danbaro G, Aboagye G S
Department of Animal Sciences, University of Ghana, Legon.
Trop Anim Health Prod. 1993 Feb;25(1):33-40. doi: 10.1007/BF02236884.
Calf records on 621 West African Shorthorn (WASH) and 3 grades of Jersey x WASH crossbreds were analysed for the effects of the level of Jersey breeding and other factors on birth weight, 205-day weaning weight and average daily gain (ADG). Crossbred calves were significantly (P < 0.01) heavier at birth than purebred WASH and birth weights increased with increasing level of Jersey breeding. No significant differences were established for 205-day weaning weight, however ADG declined with increasing level of Jersey breeding suggesting possible problems of adaptation for calves of over 75% Jersey breeding. Age of dam effect was significant and linear (P < 0.0001) for birth weight and significant and quadratic (P < 0.01) for weaning weight and ADG, with values increasing from 3-year old dams to a peak in 7 year old dams.
对621头西非短角牛（WASH）以及3个等级的泽西牛×WASH杂交牛的犊牛记录进行了分析，以研究泽西牛育种水平及其他因素对出生体重、205日龄断奶体重和平均日增重（ADG）的影响。杂交犊牛出生时显著（P < 0.01）比纯种WASH重，且出生体重随着泽西牛育种水平的提高而增加。205日龄断奶体重没有显著差异，然而，ADG随着泽西牛育种水平的提高而下降，这表明育种水平超过75%的泽西牛犊牛可能存在适应问题。母牛年龄对出生体重的影响显著且呈线性（P < 0.0001），对断奶体重和ADG的影响显著且呈二次曲线关系（P < 0.01），数值从3岁母牛到7岁母牛达到峰值。
