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3500 records of reproduction in a 7-yr period of Awassi sheep managed semi-intensively at the Kraim Research Centre were analysed. Pregnancy duration averaged 151.7±2.17 days, and was not significantly affected by litter size, although it was slightly longer in ewes carrying single lambs than in...

Kassem, R.; Owen, J. B.; Fadel, I.; Juha, H.; Whitaker, C. J.
Research and Development in Agriculture, 1989, 6, 3, pp 161-168