There is potential to genetically improve meat sheep for resistance to parasitic worms thereby improving both maternal ability and lamb performance. An experiment was conducted to assess the resistance of the offspring of genetically resistant rams or ewes crossbred with sheep which had not been selected for resistance. Data from 98 ewe lambs of resistant and unselected Merino rams crossed with Waridale ewes, and resistant and unselected Merino ewes crossed with Border Leicester rams, indicated that lambs bom to a resistant parent carried fewer worms than those from unselected parents. This study will continue by assessing the reproductive performance of the ewe lambs until their second lambing. 

Y. D Zhang, G. D Gray, B. J Crook

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 27: Reproduction; fish breeding; genetics and the environment; genetics in agricultural systems; disease resistance; animal welf, , 315–318, 1998
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