الفهرس 
Hormonal mechanisms of reproduction in ewesOnly 14 pages are availabe for public view
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Abstract
The current work was carried out at a private farm of sheep production at Gharbyia Governorate, Egypt, during the transit period of breeding season from 22 April 2010 to January, 2011. The present study aimed to increase lamb production per ewe per year through increasing number of lambing per by investigation the effect of progesterone and progestagens analogue, prostaglandin analogue, gondotrophine analogue, L- Tyrosine on synchronization estrus and ovulation of ewes in non breeding season. to estrus response, onset and duration of estrus, lambing rate, litter size, serum progesterone concentration for estrus detection.The study was carried out 50 Rahmani ewes with average live body weight of 46.16±0.13 kg and ranging between 3-7 years old were used in this study to induce oestrous and ovarian activity by hormonal treatment during anoestrus for the purpose of improving fertility and multiple lambing.