TY  - JOUR
A1  - Kawashima, Chiho
A1  - Ito, Nozomi
A1  - Nagashima, Shuntarou
A1  - Matsui, Motozumi
A1  - Sawada, Kumiko
A1  - Schweigert, Florian J.
A1  - Miyamoto, Akio
A1  - Kida, Katsuya
T1  - Influence of hepatic load from far-off dry period to early postpartum period on the first postpartum ovulation and accompanying subsequent fertility in dairy cows
JF  - The journal of reproduction and development : official journal of the Japanese Society of Animal Reproduction
N2  - The aim of the present study was to investigate nutritional and metabolic parameters during the dry and early postpartum periods of ovulatory and anovulatory cows, as well as their postpartum reproductive performance. Blood samples from 20 multiparous Holstein cows were collected once a week from the far-off dry period to 3 weeks postpartum. Early postpartum (0-3 weeks) ovulation was confirmed using plasma progesterone concentration profiles, and cows were considered ovulatory if they had resumed luteal activity by this point (n = 9), whereas cows that had not were considered anovulatory (n = 11). Data from the ovulatory and anovulatory cows were analyzed separately for the far-off dry period (7-4 weeks prepartum), the close-up dry period (3-1 weeks prepartum), and the early postpartum period (0-3 weeks). Serum gamma-glutamyl transpeptidase activity (far-off, P = 0.065; close-up, P = 0.051; and early postpartum, P = 0.030) and aspartate aminotransferase (close-up, P = 0.050 and early postpartum, P = 0.087) activities were higher in anovulatory than in ovulatory cows. The days open period was longer (P = 0.019) in anovulatory than in ovulatory cows, and the number of artificial inseminations per conception (P = 0.025) was greater. In conclusion, we found that continuously high gamma-glutamyl transpeptidase activities in serum, which may be induced by liver disorders, prevent subsequent ovulation and affect subsequent fertility, even if cows obtain sufficient ovulation-related energy and beta-carotene.
KW  - Dairy cow
KW  - First ovulation
KW  - Hepatic enzyme
KW  - Liver function
KW  - Reproductive performance
Y1  - 2016
SN  - 0916-8818
VL  - 62
SP  - 289
EP  - 295
PB  - Utha State University
CY  - Tsukuba
ER  -