Effect of embryo transfer following artificial insemination (ETFAI) on reproductive performance in dairy cows in south-western Japan
2010
Tani, M., Yamaguchi Univ. (Japan) | Hayashida, T. | Tomokawa, K. | Mito, Y. | Funakoshi, D. | Tani, C. | Sakatani, M. | Takahashi, M. | Kitahara, G. | Kamimura, S.
In order to improve the reproductive performance during the summer period, embryo transfer (ET; Japanese black embryo) following artificial insemination (AI; Holstein semen: ETFAI) was conducted in dairy cows in south-western Japan (n=56). The conception rate was improved in cows with ETFAI compared with conventional AI, which served as the control (n=195; 30.4% vs. 13.8%. P0.01). However, higher fetal loss was observed in ETFAI compared with the controls (38.1% vs. 7.4%, P0.05). Four cases of twin pregnancy resulted in 2 singletons and a set of twins. There was no difference in the plasma progesterone level on d0 or d7 (d0
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