纯种和牛快速扩繁关键技术研究

doi:10.16431/j.cnki.1671-7236.2017.06.029

Abstract

Abstract:

In order to rapid propagation of purebred Wagyu, the experiment were conducted to study the effects of high intensity superovulation, embryo sex identification and different breeds recipient cattle on calving, gestation period and calf birth weight. Wagyu were superovulated repeatedly for nine times with a 30 days interval. The results indicated that the average number of total embryos collected at the second time was 22.78, which was significantly higher than those of the fifth to ninth times (P< 0.05),and there was no significant difference between the other groups (P> 0.05).There was no significant difference between the number of transferable embryos in the first to third times (P> 0.05). The available embryos number of the second times superovulation were significantly higher than those of the fourth to ninth times (P< 0.05),and were remarkably significantly higher than those of the seventh and ninth times (P< 0.01). There were no observably differences of pregnant rate and calving rate between sex identified embryos, and regular embryos respectively (P> 0.05).The female calf percentage of sexed embryos was 95.56%. The calving rate of the Simmental-catalo receptors were higher than those of Wagyu-catalo and Holstein receptors (P> 0.05). The gestation period of Wagyu-catalo were remarkably significantly greater than those of Simmental-catalo and Holstein receptors (P< 0.01), however, there was no significant difference between Simmental-catalo and Holstein receptors (P> 0.05). The birth weight of female calves calved by Simmental-catalo receptors were higher than those of Wagyu-catalo (P< 0.05), which was extremely significantly higher than those of Holstein receptor (P< 0.01). The male calf birth weight was no significant difference in the three breeds receptors (P> 0.05). There were obvious differences between male and female calves in gestation and birth weight with in the same recipient breed.

Key words: Wagyu; intensive repeated superovulation; female calf rate; recipient; calving rate; gestation period; birth weight

CLC Number:

S814

BI Jiang-hua, FENG Chun-tao, LI Su-xia, LIN Hui-liang, SUN Gui-lai, FANG Jin-wu, LI Shu-jing. Study on the Key Techniques of Rapid Propagation in Purebred Wagyu[J]. , 2017, 44(6): 1784-1789.

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Study on the Key Techniques of Rapid Propagation in Purebred Wagyu

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