Effect of embryo transfer following artificial insemination (ETFAI) on reproductive performance in dairy cows in South-Western Japan.
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.
Tani
Mineto
M
Department of Clinical Veterinary Science, United Graduate School of Veterinary Science, Yamaguchi University, Yoshida,Yamaguchi 753-8515.
Hayashida
Takuya
T
Tomokawa
Kouichiro
K
Mito
Yasuaki
Y
Funakoshi
Daisuke
D
Tani
Chikako
C
Sakatani
Miki
M
Takahashi
Masashi
M
Kitahara
Go
G
Kamimura
Shunichi
S
D000818:Animals; D001831:Body Temperature; D002417:Cattle; D003612:Dairying / Q000379:methods; D004624:Embryo Transfer / Q000379:methods*; D005260:Female; D005307:Fertilization in Vitro / Q000379:methods* / Q000662:veterinary; D007564:Japan; D008297:Male; D011247:Pregnancy; D011270:Pregnancy, Animal / Q000502:physiology; D011374:Progesterone / Q000097:blood; D012661:Semen / Q000502:physiology
D011374:Progesterone