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Effect of Age at First Calving on First Lactation Milk Yield in Holstein Cows from Costa Rican Speci
[期刊论文] 作者：Mauren Salazar-Carranza,Gloria,
来源：兽医学(英文) 年份：2014
In order to determine the effect of age at first calving (AFC) at 305-d milk yield, a historical prospective longitudinal study of 46,029 pure specialized dairy...
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