Management of anoestrum in crossbred cattle using synthetic gonadotrophin releasing hormone
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Date
1996
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Department of Veterinary and Animal Sciences, College of Veterinary and Animal Sciences, Mannuthy
Abstract
With the object of studying the efficacy of gonadotrophin releasing hormone (GnRH) in the management of anoestrum in crossbred cattle, 40 crossbred heifers and cows which were declared anoestrus, selected from Kerala Agicultural University Livestock Farms, were allotted to three different treatment groups. Ten heifers and ten cows in group I and II were administered 5 ml of Receptal intramuscularly while ten heifers and ten cows in groups III were considered as untreated control. Among experimental animals eight heifers and seven cows responded to treatment. Analysis of data revealed significant variation in the oestrus response between experimental and control group. However, the response between cows and heifers in the experimental group was not significantly different. The time taken for induction of oestrus was 8.00 d in heifers, and 11.57 d in cows. This variation was found to be statistically significant. Parity of cows did not alter the time taken for induction of oestrus. Significant difference in the duration of oestrus was observed among heifers and cows of experimental group, the values being 18 to 72 h (mean 25.25 h) and 32 to 48 h (mean 43.42 h). Duration of oestrus was also slightly higher in the experimental than that of the control group. Majority (75%) of the heifers in the experimental group evinced high intensity of oestrus, while the majority (71.42%) of cows in the experimental group showed only medium intensity of oestrus. In the control group, however, all animals showed only medium intensity of oestrus. In the experimental group 87.5 per cent of the heifers and 85.71 per cent of the cows ovulated. The first insemination conception and overall conception rates were 25 and 75 per cent respectively in group I as against 57.14 and 71.42 per cent in group II. The corresponding values in group III (control) were zero and 50 per cent in heifers, while none of the cows in control group conceived. It could be seen that percentage of conception in the first insemination and overall conception rates in the experimental animals were higher than that in the control group. The number of inseminations required for conception in the experimental animals was slightly lower than that in control group. Overall conception rate was significantly higher in cows with II parity and above than those belonging to I parity. All the heifers which conceived had high intensity of oestrus. Similarly among cows, only 25 per cent which conceived had high intensity of oestrus, and 75 per cent showed medium intensity. The present investigation, therefore revealed that gonadotrophin releasing hormone is a potential drug, that might regulate ovarian and uterine functions and thus would improve post pubertal and postpartum reproductive efficiency. However, studies on endocrine profiles of the animals treated with gonadotrophin releasing hormone will enlighten more on the efficacy of drug in the management of anoestrum.
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