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    The change in luteal blood flow and luteal size after beta carotene and GnRH injections in early pregnant dairy cows
    (Veteriner Fakultesi Dergisi, 2012) Serhan Serhat A.Y.; Küçükaslan I.; Kaya D.; Mülazimoğlu S.B.; Emre B.; Kaçar C.; Kalender H.
    The aim of this study was to determine the effectiveness of intramuscular injections of beta-carotene (?C) and GnRH on luteal size (LS), luteal blood flow (LBF) and serum ?C concentrations in early pregnant cows. Twenty-nine Holstein-Friesian cows with a mature corpus luteum (>19mm) were randomly assigned to two groups: ?C not received (?C-; n=15) or received (?C+; n=14). All cows were treated with PGF2? 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 ?C-, the ?C+ group received ?C 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 ?C in the ?C+ group was higher than in the ?C- 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 ?C+ group on day 7 (P<0.05) and 27 (P<0.01) was higher than in the ?C- group and values increased significantly until day 37 (LS: P<0.05, LBF: P<0.01). We conclude that ?C injections significantly increased serum ?C concentrations, as well as LS and LBF.
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    Öğe
    Effect of different doses pmsg on estrus synchronization andfertility in awassi ewes synchronized with progesterone duringthe transition period
    (2011) Zonturlu A.K.; Özyurtlu N.; Kaçar C.
    The aim of the present study was to evaluate different of doses PMSG on estrus synchronization and fertility in Awassi ewessynchronized with progesterone during The transition period. A total of 92 ewes were used in this experiment. All ewes were treated witha vaginal sponge containing 30 mg fluorogestone acetate (FGA) inserted into the vagina of the ewes for 12 days. All animals were dividedinto four groups randomly and a single intramuscular (IM) dose of PMSG (group 1, 300 IU, n=21; group 2, 400 IU, n=27; group 3, 500 IU,n= 25), group 4 (n=19) was injected with 1 ml normal saline solution and as served control group at time of sponge removal. The intervalbetween the withdrawal of the sponges and estrus was observed 40.82±1.21 h, 40.20±1.14 h, 38.7±1.07 h and 41.79±1.72 h in groups 1, 2, 3 and the control group, respectively. Estrus responses were similar in all groups (group 1, 81.0%; group 2, 92.6%; group 3, 92.0%;control group, 73.78%). There were no statistically significant differences (P>0.05) between the treatment groups and the control groupfor the onset of estrus or estrus response. The duration of estrus was shorter in group 1, compared to the control group (24.9±0.85 hrvs. 29.07±1.31hr), and that this difference was statistically significant (P<0.05). Pregnancy rates were 82.35%, 80.0%, 82.60% and 78.5% ingroups 1, 2, 3 and the control group, respectively. Lambing rates were obtained 100.0% among all the groups, or litter size (1.07 to 1.21)did not differ between the treatment groups and the control group. As a result, different doses of PMSG in Awassi ewes synchronized withprogesterone during the transition period had similar effect on estrus synchronization and fertility parameters.