Managemental effects of synchronization of oestrus in goats
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Date
1993
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Department of Livestock Production Management, College of Veterinary and Animal Sciences, Mannuthy
Abstract
An experiment was conducted to study the managemental effects of synchronization of oestrus in goats using parentral administration of PGF2 alpha, on a flock of Malabari, Malabari x Saanen and Malabari x Alpine goats maintained at the Agricultural University Goat Farm, Mannuthy.
Forty cyclic goats were selected in pairs on the basis of similarity in genetic group, body weight and age. The does from each pair were allotted to two groups at random. Out of these one group at random formed the treatment group and the other control.
The goats in the treatment group were given two injections of 10 mg (I/M) each of PGF2 alpha separated by 11 days, in two batches of 10 goats each. The animals were mated at the synchronized oestrus following the second PG injection. The does in the control group were mated as and when they came to oestrus. Heat detection in the does was carried out by parading the vasectomised bucks twice daily and by observing the behavioural manifestations of oestrus.
The results and conclusions of the study are given below.
The PGF2 alpha treated goats showed 75 and 100 per cent oestrus synchrony after a mean interval of 45.93+2.19h and 48.38+2.06 h following the. first and second injection of PGF2 alpha respectively.
Of the various signs of oestrus only rapid waving of tail in the presence of male and vaginal mucous discharge were observed in all the does in oestrus. Various signs of oestrus behaviour including receptivity was found to be more pronounced in oestrus synchronized does using PGF2 alpha than in the controls. Mated does showed pricking of ear and arching of back as post coital reactions.
Conception rate following mating at the first oestrus was better in the treatment group (85%) than the controls (75%). Body weight changes during pregnancy was not found to be affected by synchronization of oestrus with prostaglandin F2alpha.
Mean gestation period in the treatment group was ,148.14+0.80 days compared to 143.88+0.78 days in the controls, the difference being significant (P < 0.05).
Overall 61.3 per cent of the parturitions were observed to occur between 0600 to 1800 hours. Maternal behaviour studies showed no significant difference between the does in the control (av. score 3) and treatment group (av. Score 2.8). Multiparas were observed to possess better maternal Instinct than the primipara does.
The new born kids attempted to stand up within 8 to 15 minutes and 68 per cent of them suckled from the dam's teat within one hour of birth. In the control group 88 per cent of the kiddings were singles and 11.77 per cent twins compared to 85.71 per cent singles and 14.29 per cent twins in the treatment group.
Comparing the growth of kids with respect to body weights and body measurements at fortnightly intervals from birth to 90 days of age, showed that the growth rate of kids born from synchronized oestrus was similar to that of control kids.
Suckling behaviour in the kids revealed that the overall mean duration of suckling was 2.61 minutes and mean rate of suckling was 49.65 g per minute. It was observed that the rate of butting and intensity of tail wagging increased as the flow of milk from the teats got reduced.
The mean daily milk yield from first to thirteenth week of lactation in the control and treatment g roups were found to be 0.509+0.015 kg and 0.493+0.014 kg respectively.
Man nours requirements to look after the does and raising the kids born to tham to 90 days of age in both the control and treatment group, revealed that there was a man hour saving of 12.3 per cent in the oestrus synchronized group (treatment) than the untreated controls.
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