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首页> 外文期刊>Tropical Animal Health and Production >Milk yield and composition and body weight of offsprings of mixed-breed goats on semi-arid rangelands with different rainfall
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Milk yield and composition and body weight of offsprings of mixed-breed goats on semi-arid rangelands with different rainfall

机译：不同降雨的半干旱牧场混合山羊后代牛奶产量和体重

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The objective was to characterize milk yield and composition from mixed-breed goats kidding in winter and grazing rangelands with 221 (n = 15), 334 (n = 20), or 441 (n = 12) mm of annual rainfall in northern Mexico (22-25 degrees N). Weekly milk yield and composition were recorded and progeny growth performance assessed. Body weight loss during lactation was the highest (6.4 kg) for goats on rangeland with 441 mm of rainfall than goats on 221 mm (1.6 kg), or 334 mm (1.8 kg;P < 0.01). The highest daily milk yield was for goats on 221 mm (498 mL;P < 0.01). There was not an evident peak of lactation and milk yield increased uninterruptedly at the end of lactation. Milk fat was negatively related to milk yield and goats on rangeland with 334 mm had the greatest milk fat content (P < 0.001). Milk protein and lactose content were higher in goats on rangeland with 221 mm (P < 0.01). Goat kids on rangelands with 221 and 441 mm grew faster and were heavier (P < 0.001) at weaning than kids reared in other rangelands. Weaning weight was positively related to milk yield (P < 0.001); but not milk components (P > 0.05). In conclusion, moderate milk yield of mixed-breed goats on rangeland is feasible with parturitions in winter, and milk yield is not affected by reduced annual precipitation in rangelands of northern Mexico. Offspring growth performance depends on maternal milk yield, but not milk composition. Nevertheless, slow growth to weaning of offspring had adverse effects on time to reach adequate market weight.
机译：该目的是在冬季开玩笑的混合品种山羊的牛奶产量和组成，并在墨西哥北部的年降雨量的221（n = 15），334（n = 20），或441（n = 12）mm的牧场（ 22-25℃）。记录每周乳产量和组合物，并评估后代生长性能。哺乳期间的体重减轻是牧场的山羊最高（6.4千克），其降雨量441毫米，比山羊（1.6千克），或334毫米（1.8公斤; P <0.01）。每日最高的牛奶产量适用于221毫米（498毫升; P <0.01）。在哺乳期结束时没有明显的哺乳期高峰和牛奶产量不间断地增加。牛奶脂肪与牛奶脂肪与牛奶收益率呈负相关，牧场的牧场具有334毫米的牛奶脂肪含量最大（P <0.001）。牧场牛奶蛋白和乳糖含量高出221毫米（P <0.01）。山羊在牧场上的孩子们在牧场增长更快，而在被断奶的速度比其他牧场饲养的人更厉害（p <0.001）。断奶重量与牛奶产量正相关（P <0.001）;但不是牛奶成分（p> 0.05）。总之，在冬季的分娩中，牧场混合品种山羊的中等牛奶产量可行，墨西哥北部的牧场降水量减少的牛奶产量不受影响。后代增长性能取决于产妇乳屈服，但不是牛奶组成。尽管如此，对后代断奶的缓慢增长对时间有不良影响，以达到足够的市场重量。

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