犊牛断乳对产后母牦牛发情周期恢复的影响

摘要

对150头当年产母牦牛在发情季节进行犊牛断乳，同时对166头隔年产干乳母牦牛进行对照，观察了犊牛断乳后母牦牛发情周期恢复的规律。结果表明断乳组母牦牛发情率为69．33％，发情持续期为15d；隔年产母牦牛发情率为89．94％，发情持续期为62d。%Calf weaning was studied in 150 female yaks in estrus season; 166 female yaks with no milk, birth of second year were studied as control gronp. Estrus cycle yecovery of weaning female yaks was studied . The results showed that estrus rate for weaning female yaks was 69.39% ,duration of estrus for 15d,Estrus rate for birth of second year was 89.94%, duration of estrus 62d.