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首页> 外文期刊>Tropical Animal Health and Production >The Survival, Growth and Carcase Characteristics of Crossbred Beef Cattle in Tanzania
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The Survival, Growth and Carcase Characteristics of Crossbred Beef Cattle in Tanzania

机译：坦桑尼亚杂种牛的生存，生长和Car体特征

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摘要

Sires of seven Bos taurus beef breeds were mated with Bos indicus Boran cows at two sites, one near sea level and the other at about 1000 m altitude, and over three years. Purebred Boran calves provided controls for comparisons between sire breeds for growth to 4 years of age, mortality and carcase characteristics in a range environment where all the animals were kept under a similar management regime. Numerous sire breed×site, sire breed×year of birth and site×year of birth interactions were established. Mortality was high, but there was no significant sire breed effect, although purebred Borans had a higher survival than crossbred calves. There was no significant difference between genotypes in birth weight. Generally, Bos taurus cross steers achieved greater live weight gains and heavier carcase weights at 4 years of age than did purebred Borans. Limousin-cross steers had significantly (p<0.05) less fat in the tenth rib sample joint than any of the other genotypes. A productivity index that combined calf survival and carcase weight indicated that the Chianina crosses were more productive than any other genotype at either site. Purebred Borans were more productive than all the Bos taurus crossbreds with the exception of the Chianina crosses at site 1, but were only superior to the Limousin crosses at site 2, which was at the higher altitude. When lean meat yield was introduced into the productivity index, the Boran purebreds were the least productive at site 2.
机译：将七个Bos taurus牛品种的Sires与Bos indicus Boran母牛在两个地点交配，一个地点靠近海平面，另一个地点海拔约1000 m，并且历时三年。纯种的Boran犊牛提供了对照，用于在所有动物都以相似的管理制度饲养的范围内的环境中，比较到4岁时的父亲公种，死亡率和，体特征。建立了众多的父本品种×产地，父本品种×出生年和地点×出生年的相互作用。死亡率很高，但没有明显的父系繁殖效应，尽管纯种的Boran的存活率比杂种的犊牛高。出生体重的基因型之间没有显着差异。通常，与纯种的Boran相比，Bos taurus杂交牛在4岁时可实现更大的活体增重和更大的car体重量。与其他基因型相比，与利穆赞杂交的ers牛在第十肋骨样本关节中的脂肪明显少（p <0.05）。结合小牛存活率和car体重量的生产力指数表明，Chianina杂交比任何一个部位的任何其他基因型的生产力都更高。除了1号站点的基安纳纳杂交，纯种硼烷比所有Bos金牛座杂交的生产力更高，但仅优于2号站点的利穆赞杂交，后者处于较高的海拔。当将瘦肉产量引入生产力指数时，Boran纯种在站点2的生产力最低。

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