Estrus Synchronization and Artificial Insemination in Goats during
Low Breeding Season-A Preliminary Study
A. Mehmood*, S. M. H Andrabi, M. Anwar and M.
Rafiq
Animal Sciences Institute, National Agricultural
Research Centre,
Park Road,
Islamabad-45500, Pakistan *Corresponding author: mehmood_apk@yahoo.com
Abstract
A pilot project was initiated to introduce
artificial insemination (AI) in goats at farmer level with chilled semen. Does
(n=18) were synchronized with
progesterone impregnated vaginal sponge (60 mg Medroxyprogesterone acetate; MAP)
for 11 days.At 48 hrs prior to removal
of the sponges, intramuscular injection of 400 IU equine chorionic gonadotropin
(eCG) and cloprostenol (0.075 mg) was given. Fixed time vaginal insemination
(43-45 hrs after sponge removal) was conducted twice (at 12 hrs interval) in 17
does with chilled Beetal buck semen (4°C) extended with Tris-citric acid (TCA) or skimmed milk
(SM) based extender (75 x 106 sperm/ml). Pregnancy test was performed
at 45 days post insemination through ultrasonography. An overall 94.5% (17/18) of does showed heat signs and
78% of them were detected in heat between 12 - 24 hrs of sponge removal. An
overall 29.4% (5/17) pregnancy rate was recorded. Higher pregnancy rate (44.4%)
was obtained in does inseminated with SM extended semen as compared to TCA extended semen (12.5%). Results were encouraging in the sense that to the
best of our knowledge it was the first report of kidding through AI in heat
induced does in
Pakistan. Moreover, it indicated the feasibility of using
synchronization and fixed time AI during low breeding season to enhance the
reproductive efficiency in local goats.