MANAGEMENTAL EFFECTS OF SYNCHRONIZATION OF OESTRUS IN GOATS
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Date
1993
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COLLEGE OF VETERINARY AND ANIMAL SCIENCES Mannuthy - Thrissur
Abstract
An experiment was conducted to study the managemental
effects of synchronization of oestrus in goats using
parentral administration of PGF2alpha, 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 (l/M) each of PGF2alpha 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 PGF2alpha treated goats showed 75 and 100 per
cent oestrus synchrony after a mean interval of 45.93+2.19h
and 48.38+2.05 h following the first and second injection
of PGF2alpha respectively.
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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 PGF2alpha 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
Ill
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 groups were found
to be 0.509+0.015 kg and 0.493+0.014 kg respectively.
Man hours 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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