Abstract
The aim of this study was to determine the effectiveness of intramuscular injections of beta-carotene (βC) and GnRH on luteal size (LS), luteal blood flow (LBF) and serum βC concentrations in early pregnant cows. Twenty-nine Holstein-Friesian cows with a mature corpus luteum (>19mm) were randomly assigned to two groups: βC not received (βC-; n=15) or received (βC+; n=14). All cows were treated with PGF2α and inseminated twice, 48 and 72h after the treatment. Last AI was considered to be day 0. All cows received GnRH on day inseminations, 7 and 17. Different from the βC-, the βC+ group received βC intramuscularly on day 7 and 17. In both groups, measurement of LS and LBF were performed on days 7, 10, 17, 27 and 37 by transrectal B-mode and colour Doppler ultrasonography. Blood samples were collected on each examination day. Only cows that became pregnant were included in the statistical evaluation. The concentration of βC in the βC+ group was higher than in the βC- at all examination days except day 17 (P<0.05). There was no significant difference between groups concerning the progesterone concentrations (P>0.05). The LS and LBF of βC+ group on day 7 (P<0.05) and 27 (P<0.01) was higher than in the βC- group and values increased significantly until day 37 (LS: P<0.05, LBF: P<0.01). We conclude that βC injections significantly increased serum βC concentrations, as well as LS and LBF.
Serhan Serhat, A Y