Effect of human chorionic gonadotrophin,gonodotrophin releasing hormone and prostaglandin F2 alpha in augmenting conception rate of repeat breeder cattle
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Date
2003
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Department of Animal Reproduction, College of Veterinary and Animal Sciences, Mannuthy
Abstract
Repeat breeding in cattle especially due to ovulatory disturbances has
become a frustrating problem under field conditions. The present study was
aimed to formulate an effective and economic therapy for this problem.
Hence three therapeutic approaches viz. human chorionic gonadotrophin,
Gonadotrophin releasing hormone and prostaglandin F2 alpha were
undertaken, and its efficacy and economic viability was compared. The
material for the study consisted of repeat breeder cross-bred cows and
heifers presented at Artificial insemination centre and bull station, attached
to the Department of Animal Reproduction, College of Veterinary and
Animal Sciences, Mannuthy, Thrissur. Occurrence of ovulatory disturbance
were studied and white side test was done to exclude those with infection
Overall occurrence of anovulation and delayed ovulation were 7.38
and 15.77 per cent.Anovualtion in cows and heifers were 5.21 and 17.82 and
delayed ovulation was 14.7 and 8.8 per cent respectively. On study of
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characteristics of cervical mucus, clear colour (93 per cent), thick
consistency (43.47 per cent) and atypical crystallization (57.97 per cent)
were found to be high in repeaters with ovulatory disturbances.
Spinnbarkeit value varied significantly (t' = - 4.2779, P < 0.01) where as pH
variation was non significant (t' = 2.37, P > 0.05) between normal and
repeaters. Changes in the tubular tract such as vulval oedema, hyperaem ia of
vaginal mucosa and uterine tonicity were found to be medium and low in
most of the repeat breeders.
Repeat breeders with ovulatory disturbances were randomly allotted
to three groups of twelve each group-A, group B and group C.
Intramuscular administration of Human chorionic gonadotrophin (Chorulon,
1500.I.U),GnRH analogue (Buserelin acetate -Receptal, l Ougjand
Prostaglandin F2 alpha analogue (Luprostiol - Prosolvin, 3 mg) were done
immediately after insemination in group-A ,group B and group C
respectively.
There was a significant reduction in duration of oestrum in group A
(50.17 to 38.08 hours) and group B (50.08 to 36.17 hours) and non
significant in group C. Ovulatory response was 33.33, 75.00 and 66.66 per
cent respectively in group A, Band C. Conception rate was 25,50,50 and
22.22 per cent respectively in group A, B, C and repeaters given double
insemination at 24 hours interval. The cost for treatment per animal in
rupees and amount required per conception in rupees was 220, 103,44, and
35 and 880, 206, 88 and 157.5 respectively in group A, B, C and those given
double insemination. Hence it is inferred that PGFz alpha treatment
immediately after insemination is preferred to treatment with GnRH or hCG
or double insemination at 24 hour interval and that administration ofGnRH
is found better than hCG in repeat breeding due to ovulatory disturbances in
cattle.
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