Managing reduced-fertility beef herds.

Modern veterinary practice Pub Date : 1984-07-01
M F Spire, L D Spire
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Abstract

Many beef herds with less than ideal reproductive efficiency have an 85-90% pregnancy rate, a breeding season longer than 90 days, and less than 60% of the calf crop born in the first 21 days of the calving season. The previous years' fertility levels should be used as a guideline for estimating calf losses and assessing improvement after implementation of reproductive programs. Acute infectious causes of reproductive inefficiency tend to be expressed as abortion or delayed conception. Management-related reproductive problems are common and involve inadequacies in nutrition, replacement heifer development, bull fertility and cow culling.

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管理生育力下降的肉牛群。
许多繁殖效率不理想的牛群有85-90%的怀孕率,繁殖季节超过90天,在产犊季节的前21天出生的小牛不到60%。前几年的生育水平应作为估计小牛损失和评估实施繁殖计划后的改善情况的指导方针。生殖效率低下的急性感染原因往往表现为流产或延迟受孕。与管理有关的生殖问题很常见,涉及营养不足、替代小母牛发育、公牛生育力和奶牛淘汰。
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