Reduction in the number of artificial insemination after superovulation using gonadotrophin releasing hormone in Japanese black cattle
2006
Isozaki, Y.(Fukuoka-ken. Agricultural Research Center, Chikushino (Japan)) | Koga, T. | Inada, S.
This study was coducted to evaluate the effects of gonadotrophin releasing hormone (GnRH;fertirelin acetate) administration and timing of artificial insemination (AI) after superovulation on embryo recovery results in japanese black cattle. The number of transferable embryo recovered from the superovulated cattle administrated GnRH at 48 or 56 hours after prostaglandin F2 a (PG) administration and single AI at 56 or 72 hours after PG was almost the same or more, compared with those administrated GnRH at 48 hours after PG and double AI at 56 and 72 hours after PG. In the cattle administrated 200mug GnRH at single AI method, unfertilized egg rate was significantly lower and the number of transferable embryo was increased, compared with those administrated 100mug GnRH. These results suggest that the number of AI can be reduced from 2 to 1, by 200mug GnRH administration at heat induced by superovulation.
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