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首页> 外文期刊>Tropical Animal Health and Production >Growth traits of crossbreds of Ankole with Brown Swiss, Holstein Friesian, Jersey, and Sahiwal cattle in Rwanda
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Growth traits of crossbreds of Ankole with Brown Swiss, Holstein Friesian, Jersey, and Sahiwal cattle in Rwanda

机译：棕色瑞士，霍尔斯坦弗里斯，泽西岛和卢旺达的Sahiwal牛群的生长特征

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摘要

The objective of the study was to compare body weights and growth from birth to 18 months of age of various groups of crossbred cattle born from 1999 to 2007, being crossbreds of Ankole (A) with Brown Swiss (B), Holstein Friesian (F), Jersey (J), and Sahiwal (S). Average weights were 26.5 kg at birth, 161 kg at weaning, and 226 kg at 18 months. Both season and sex significantly affected birth weight (BW), weight at 8 and 18 months (W8 and W18), and average daily gain from weaning to 18 months (ADG18) and, unlike season, sex significantly affected average daily gain to 8 months and weaning age. The general trend was that average daily gain attained a maximum before weaning and thereafter decreased until 18 months. Least square means for AB and AF calves were comparable and significantly differed only for W18 and ADG18. AJ had the lowest BW but was comparable with AS, AJxS, and ASxJ for W8, age-adjusted weaning weight, and W18. Generally, AF was heavier than other breed groups, but the difference was smaller than expected probably because environmental conditions did not allow full expression of genetic potential for growth.
机译：本研究的目的是比较1999年至2007年出生的不同杂交牛群体从出生到18个月龄的体重和生长情况，这些牛是Ankole（A）与Brown Swiss（B）、Holstein Friesian（F）、Jersey（J）和Sahiwal（S）的杂交牛。出生时平均体重为26.5公斤，断奶时为161公斤，18个月时为226公斤。季节和性别均显著影响出生体重（BW）、8个月和18个月时的体重（W8和W18）以及从断奶到18个月时的平均日增重（ADG18），并且与季节不同，性别显著影响到8个月时的平均日增重和断奶年龄。总的趋势是，平均日增重在断奶前达到最大值，然后下降到18个月。AB小牛和AF小牛的最小二乘平均值具有可比性，仅W18和ADG18之间存在显著差异。AJ的体重最低，但在W8、年龄调整断奶体重和W18方面与AS、AJxS和ASxJ相当。一般来说，AF比其他品种组重，但差异小于预期，可能是因为环境条件不允许充分表达生长的遗传潜力。

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