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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：该研究的目的是将体重和生长从1999年至2007年出生的各种杂交牛出生的18个月，作为棕色瑞士（B），Holstein Friesian（F）的Ankole（A）的杂交杂交，泽西（j）和sahiwal。出生的平均重量为26.5千克，断奶161公斤，18个月的两月为226公斤。季节和性别均显着影响出生体重（BW），8和18个月（W8和W18），以及断奶的平均每日收益到18个月（ADG18），而且与季节不同，性别会显着影响平均每日增益到8个月和断奶年龄。一般趋势是，在断奶前平均每日增益最大限度地达到最大值，此后直至18个月下降。用于AB和AF犊牛的至少方形是可比的，仅适用于W18和ADG18的显着差异。 AJ具有最低的BW，但与W8，年龄调整后的断奶重量和W18相比，AJXS和ASXJ相当。通常，AF比其他品种群体重，但差异小于预期可能是因为环境条件不允许完全表达生长遗传潜力。

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