拴系饲养与自由采食对西门塔尔青年母牛超排效果的影响

摘要

In 2009 and 2010, the two different feeding styles were used in Simmental heifers. After 102 Simmental heifers were superovulated, the results in two groups were compared. The results showed that in 2009 and 2010, the average recovery eggs and transferable embryo yield were 15.04 vs 13.65 and 8.51 vs 6.93, respectively. The embryo development rate in two groups was different. In conclusion under inadequate nutrition in the long term, the growth and development in Simmental heifers was affected, and their fertility, superovulation response and transferable embryo yield are decreased.%本文分析比较了2009和2010年两种不同饲养管理方式对102头西门塔尔青年母牛超排效果的影响。结果表明，2009年拴系饲养的供体牛超排效果明显好于2010年自由采食的供体牛，平均回收卵和有效胚胎分别为15．04枚、13．65枚，8．51枚、6．93枚。2009年的有效胚胎率（56．58％）也高于2010年（50．73％）。从胚胎发育阶段的比例来看，2010年供体牛的扩张囊胚和囊胚比例比2009年低，而未受精和退化胚胎比例较高。结果显示，青年母牛长期处于营养摄入量不足的情况下，不仅影响体成熟，还会降低母牛的繁殖机能和超排效果以及有效胚胎数。