Abstract
Purpose: to study the effect of the duration of the use of progesterone for synchronization of the sexual cycle and the elaboration of the Dorper breed in the reproduction season.Materials and methods. The object of the study was bright (n = 43) of the Dorper breed. Yarok was synchronized by the introduction of pessaries with progesterone (sidr) and injection on the day of removal of the CIDR of a chorionic gonadotropin of horses (HCH) in a dosage of 500 ME. Sheep were divided into three groups: I group (n = 13) – for 9 days a CIDR with progesterone (CIDR® OVIS, Zoetis, Madrid, Spain) was introduced for 9 days; Group II (n = 9) – CIDR was introduced for 11 days; Group III (n = 21) – CIDR was introduced for 13 days. In all three groups on the day of removal of the pessary, intramuscular injection of the HCL 500 IU is made. Upon completion of synchronization, observations of the signs of estrus were observed within 72 hours. Jacket was judged by the beginning of the estrus, when the state of immobility and the allowance of the ram of the ram was recorded. The duration of estrus was measured from the moment of the first intercourse until the sheep began to reject the male.Results. The average interval between the removal of the pessary and the beginning of estrus in three groups was: in the first group – 38,7±5,1 hours; in the second group – 34,6±5,8 hours; In the third group – 52,4±4,4 hours. The minimum time from the extraction of CIDR to the beginning of the estrus was installed in the first group – after 12 hours, the maximum time was recorded in the third group – 96 hours.Conclusion. The reliable effect of progesterone containing a gestagen drug on the reproductive indicators of the fierce, mainly at the beginning of the estrus, has been demonstrated. The most optimal is the use of CIDR with a constant rate of progesterone release by 9-11 days, since these groups have a 100% reaction to hormonal treatment.
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