Abstract
The aim of this study was to determine the effect of tocopherol and selenium on the performance of buserelin (GnRH analogue) for estrus induction in anestrus mares. A total of 18 seasonally anestrus mares were divided into three equal groups (n=6 in each) after ovarian scanning. Mares in group A (treatment group) were treated with tocopherol and selenium intramuscularly along with daily dose of buserelin. Mares which came into heat within ten-day buserelin protocol, further injections of buserelin for those mares were stopped. Mares in group B were treated with buserelin intramuscularly only for ten days. Mares which came into heat within ten-day buserelin protocol, further injections of buserelin were stopped. Blood/serum was collected from each experimental mare kept in different groups (A-C) at days 1, 11, 12, 13 and 14. Onset of estrus signs was 83.3, 33.3 and 0% in group A, B and C, respectively, that was significant (P<0.05) among groups. Follicular dynamics were 20.24±3.00, 14.59±2.24 and 10.35±0.63mm in groups A, B and C, respectively with significant (P˂0.05) difference. Change in serum E2 contents was significantly (P˂0.05) different among groups A, B and C whereas progesterone concentration showed non-significant difference among groups.
Highlights
Animals can be categorized as long-day (LD) breeders and short-day (SD) breeders based on when they are fertile relative to day length
A significantly greater (P0.05) number of mares, given Buserelin and Selevit combination showed signs of estrus compared with control and those administered with Buserelin alone
Difference (P0.05) in number of mares that were administered Buserelin compared with control mares, for the onset of signs of estrus
Summary
Animals can be categorized as long-day (LD) breeders and short-day (SD) breeders based on when they are fertile relative to day length. The circannual rhythm of reproduction is mainly regulated by photoperiodic changes with the increase in day length preceding the onset of the breeding season (Nagy et al 2000; Kwong et al 2018). The extended melatonin secretion during the long periods of darkness has an inhibitory effect on GnRH secretion which leads to reduction in gonadotropin secretion, luteinizing hormone (LH) and to a lesser extent follicle‐stimulating hormone (FSH) (Nagy et al 2000; Murphy 2019). Tocopherol has a great influence on the reproductive cycle, as it may increase the reproductive performance of
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