Augmentation of Reproductive Performance Through Controlled Breeding in Goats
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Date
2024-04-08
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MAFSU, Nagpur
Abstract
The present research work was entitled “Augmentation of reproductive
performance through controlled breeding in goats”. The experimental goats
(n=30) were randomly allocated in three groups, goats of two groups were
synchronized by adopting two different synchronization protocols. The goats of
Group-I (n=10) were synchronized by using Double Prostaglandin Protocol (inj. D-Cloprostenol 75μg) administered by intramuscular route 10 days apart,
whereas, goats of Group-II (n=10) were synchronized by adopting a short
progestagen treatment (0.3g progesterone) with the intravaginal insertion of CIDR
kept in situ for a duration of 9 days. Group-III experimental goats (n = 10) were
exposed with adult intact buck and observed for natural estrus.
The goats of all the three groups were observed for natural/synchronized
estrus and were mated with the adult intact proven buck during standing heat.
The parameters viz estrus response, behavioural and physical signs of estrus,
onset of estrus and estrus duration, pre-ovulatory follicular dimensions at estrus,
conception rate and correlation between ovarian pre-ovulatory follicular size on
conception in goats were studied.
The goats of group I synchronized by employing double prostaglandin
injections, the percentage (%) of showing estrus discharge, wagging of tail,
receptive to mounting, frequent micturition and swelling of vulva were found to
be 50.00, 100.00, 25.00, 75.00 and 12.50, respectively. The goats of group II
treated with intravaginal insertion of CIDR the percentage (%) of wagging of tail,
frequent micturition and swelling of vulva were recorded as 100.00, 71.42 and
14.28, respectively. The overall percentage of estrus symptoms (natural) like
estrus discharge, wagging of tail, frequent micturition and swelling of vulva
exhibited by goats in group III were observed as 30.00, 100.00 80.00, 20.00,
respectively. The overall percentage of goats exhibiting estrus and estrus response
in Group I, Group II and Group III were 80 %, 70 % & 100 %, respectively.
The mean interval of exhibition of estrus (h) from the end of the treatment
and mean duration of estrus (h) in does reported in present study in Group I,
Group II and Group III were recorded as 63.63±9.93 and 39.56 ±2.40, 45.86±1.64
and 45.14±3.27 and 0.00±0.00 and 37.50±1.77, respectively.
The trans-rectal ultrasonic images in terms of diameter of ovarian preovulatory
follicles (mm) (Mean ± SE) during estrus in does in Group I, Group II
and Group III were recorded as 7.30 ±0.56, 6.85 ±0.12 and 7.01 ± 0.42,
respectively. The goats subjected for double injection regimen of PGF2α for estrus
synchronization shown marginally larger pre-ovulatory follicular size during
estrus Conception rates of goats belonging to Group I, Group II and Group III
were found to be 87.5 %, 57.14% and 70 %, respectively. Higher conception rates
following double PGF2α protocol for synchronization of estrus in goats were
observed.
The mean dimensions of pre-ovulatory follicles and conception rate in
does Group I, Group II, and Group III were recorded and there was no significant
correlation between pre-ovulatory follicle size and conception rates in does
exhibiting natural as well as induced estrus.