Breed and heterosis effects on wool and lamb production of rotationally crossed ewes Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/5h73q069w

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  • One thousand twenty-three lambing records of 351 ewes bred in a rotational crossbreeding system involving Columbia or Targhee, Hampshire and Finnish Landrace breeds were examined. A regression approach was used to determine the effects of breeds and heterosis on wool grade, greasy fleece weight, ewe weight at lambing, lambing date, number of lambs born and weaned and litter weight at birth and weaning. Relationships among these ewe production traits were examined by means of residual correlations, and repeatabilities were calculated. A ewe production index equal to the weight of lamb weaned by a ewe plus three times her greasy fleece weight was computed for various purebred and crossbred matings. It was concluded that heterosis of the dam was the most important factor influencing ewe productivity.
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