J. Anim Sci.
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J. Anim Sci. 1981. 53:966-976.
© 1981 American Society of Animal Science
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Genetic, Environmental and Interaction Effects on Lamb Survival, Cumulative Lamb Production and Longevity of Crossbred Ewes1

William D. Hohenboken2 and Stephen E. Clarke2

Oregon State University, Corvallis 97331

Abstract

Crossbred ewes from North Country Cheviot, Dorset, Finnsheep or Romney sires and Suffolk or Columbia-type dams were mated to Hampshire rams and maintained on hill pasture or irrigated pasture management systems. Number of lambs born and weaned and kilograms of lamb midway through lactation and at weaning per ewe entering the experiment were investigated after 1 through 5 cumulative years of production. Lamb survival percentages and ewe longevity also were examined. Breed effects, management system effects and interactions did not affect lamb survival percentages significantly. In both management systems, Finnsheep and Dorset crossbred ewes were more productive than Romney and Cheviot crossbreds. Sire breed and management system interacted, however, in that Cheviot crossbreds were more productive on hill pastures than on irrigated pastures, while Dorset, Finnsheep and Romney crossbreds were more productive on irrigated pastures than on hill pastures. There were also important dam breed x management system interactions. On hill pastures, Columbia crossbred ewes were more productive than Suffolk crossbreds, while on irrigated pastures, the reverse was true. Breed x management system interactions for longevity were of the same form, demonstrating that breed differences for total productivity were partly dependent upon breed differences for longevity. Sire of ewe, nested within sire breed x birth year subclasses, accounted for 1 to 9% of total phenotypic variation in ewe production traits.

Footnotes

1 Tech. Paper No. 5709, Oregon Agr. Exp. Sta. Contribution to North-Central Regional Project NC-111, "Increased Efficiency of Lamb Production."

2 Dept. of Anim. Sci.






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