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Effects of Energy Level and PMSG Dose on Reproductive Performance of Zel Ewes Bred to Shal or Zel Rams

Author(s): M. Mohajer | A.R. Alimon | H.B. Yaakub | A.N. Naslaji | A. Toghdory

Journal: Journal of Animal and Veterinary Advances
ISSN 1680-5593

Volume: 11;
Issue: 6;
Start page: 809;
Date: 2012;
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Keywords: Ewe | flushing | energy level | prolificacy

One hundred eighty four Zel ewes, 3-5 years of age were used to evaluate the effects of strategic supplementary feeding prior to mating and doses of PMSG to ewe synchronization on reproductive performance of Zel ewes mated to Zel or Shal rams. The ewes fed diets containing two levels of metabolizable energy, 2.0 or 2.3 Mcal kg-1 with 115 g kg-1 DM crud protein for 21 days prior to mating period. After 7 days of experiment, the ewes were synchronised with intra vaginal CIDR devices containing 1.9 g progesterone for 14 days. Ewes received 300 or 500 IU of PMSG injection at CIDR removal time and later mated with Zel or Shal ram. All important reproductive parameters such as ewe fertility, prolificacy, lambing rate, lamb mortality and twining measured. The results showed that Shal rams increased ewe fertility (p
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