The Journal of veterinary medical science · 2009
Effect of embryo transfer following artificial insemination (ETFAI) on reproductive performance in dairy cows in South-Western Japan.
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Tani Mineto, Hayashida Takuya, Tomokawa Kouichiro, Mito Yasuaki, Funakoshi Daisuke, Tani Chikako, Sakatani Miki, Takahashi Masashi, Kitahara Go, Kamimura Shunichi
Аннотация
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%, P<0.01). However, higher fetal loss was observed in ETFAI compared with the controls (38.1% vs. 7.4%, P<0.05). 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=AI), but rather lower rectal temperature was observed on d7 or d8 (38.7 degrees C vs. 39.4 degrees C and 38.8 degrees C vs. 39.1 degrees C, P<0.05) in pregnant cows compared with those that were open. ETFAI could improve reproductive performance in dairy cows during the summer period in south-western Japan.