The effect of GnRH given on day of mating on ovarian function and reproductive performance in Lohi sheep
2010
Lashari, M.H. (Bahauddin Zakariya Univ., Multan (Pakistan). Inst. of Pure and Applied Biology) | Tasawar, Z. (Bahauddin Zakariya Univ., Multan (Pakistan). Inst. of Pure and Applied Biology)
The present study was conducted to investigate the effects of GnRH (Dalmeralin) treatment given on the day of mating on reproductive performance in Lohi sheep. Seventy six ewes 3-5 year old, weighing 44 plus minus 0.4 Kg were put to rams at synchronized estrus using two intramuscular injections of 2 ml PGF2-alpha analogue (Dalmazin) 11 days apart. These animals were divided into two equal groups through random stratification by body weight and were given either saline (group I) or 2 ml GnRH (group II) on day of mating. A total of 16 ewes were slaughtered on day 25 of pregnancy (eight ewes from each treatment group). GnRH administration on the day of mating increased (P less than 0.01) plasma progesterone concentration compared to control. There was a tendency for a higher non-return rate and a lower number of ewes returned to estrus in the GnRH treated ewes, but the difference between the two groups was non-significant (P grater than 0.05).
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