J. Anim Sci.
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J. Anim Sci. 1987. 65:685-691.
© 1987 American Society of Animal Science
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Breed Differences in Uterine and Ovarian Measurements in Gestating Swine1

K. L. Davis2, O. W. Robison3 and V. D. Toelle4

North Carolina State University, Raleigh 27695-7621

Abstract

Ovulation rate, ovary weight, corpora lutea weight and uterine length were measured at 10 or 35 d of gestation in Duroc (199) and Yorkshire gilts (114). Embryos were counted at d 35. Yorkshires had significantly more corpora lutea than Durocs (13.6 vs 12.3 at d 10; 13.9 vs 12.4 at d 35). At d 10 breeds did not differ in uterine length, but by d 35 Duroc uteri were longer (P<.01) than Yorkshire uteri (411 vs 375 cm) despite having fewer (P>.05) embryos (9.9 vs 10.5). Ovary weight did not differ between breeds at 10 or 35 d. Homogeneity analyses showed that the correlation matrices were significantly different between breeds at d 35 but not at d 10. In Durocs, high positive correlations existed between total embryo number and corpora lutea number (.57), ovary weight (.53) and corpora lutea weight (.25), whereas corresponding correlations were small in Yorkshires (.21, –.02 and –.03, respectively). In Yorkshires, strong negative correlations existed between total embryo survival and corpora lutea number (–.55), ovary weight (–.30) and corpora lutea weight (–.55), but in Durocs corresponding correlations were small (–.12, .14 and –.10, respectively). These results suggest that animal scientists should consider breed differences in levels of performance and its relationships among traits when designing or interpreting experiments.

Footnotes

1 Paper no. 10837 of the Journal Series of the North Carolina Agr. Res. Serv., Raleigh, NC 27695-7601.

2 Present address: 2220 Country Club Dr. #4, Woodbridge, IL 60517.

3 Dept. Anim. Sci.

4 Present address: Dept. Poul. Sci., The Ohio State Univ., Columbus 43210-1098.






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Copyright © 1987 by the American Society of Animal Science.