J. Anim Sci.
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J. Anim Sci. 1973. 36:828-831.
© 1973 American Society of Animal Science
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Genetic Factors and Hormonal Stimulation Affecting Weight and Fertility of Ewe Lambs1

D. E. West2, R. Bogart3 and N. A. Hartmann3

Oregon State University, Corvallis 97331

Abstract

One hundred seventy-nine ewe lambs from a three-breed polyallel cross involving the Willamette, Suffolk and Hampshire breeds were used to study the genetic aspects of fertility. Ewe birth weight, ewe weight at mating and fertility were analyzed in relation to heterosis, general combining ability, maternal effect, reciprocal differences, and the effects of a hormone treatment. Treatment consisted of three injections of anterior pituitary extract 2 weeks apart beginning 7 weeks before the breeding period. One-half of the ewes from each breed group were treated, others were not. There was no significant difference in fertility of the treated and control ewes. In some cases, treatment adversely affected fertility, in particular in ewe lambs of the Suffolk breed. Willamette and Hampshire ewes were unaffected.

For ewe birth weight, heterotic effects approached significance (P<0.10) and accounted for 2.8% of the total variance in birth weight. Comparisons of reciprocal crossbreds with the mid-parent mean snowed crossbreds 0.3 kg heavier at birth.

Footnotes

1 Tech. Paper No. 3384, Oregon Agricultural Experiment Station, Oregon State University, Corvallis.

2 Present Address: Washington Cooperative Extension Service, Yakima.

3 Professor of Animal Genetics, Animal Science Department and Assistant Professor of Statistics, Department of Statistics, respectively.






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