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Journal of Animal Science, Vol 69, Issue 12 4801-4809, Copyright © 1991 by American Society of Animal Science

JOURNAL ARTICLE

Estimates of genetic parameters for direct and maternal effects on embryonic survival in swine

L. T. Gama, K. G. Boldman and R. K. Johnson
University of Nebraska, Lincoln 68583-0908.

Survival of 16,838 potential embryos was determined by counting corpora lutea and fetuses at 50 d of gestation for 1,081 litters by 225 sires. These data, coded as 1 or 0 depending on whether an ovulation was represented by a fetus, were used to estimate direct and maternal additive genetic variances and their covariance for embryonic survival. Data were from first-parity gilts of a Large White-Landrace composite population subdivided into two lines, one selected for an index of ovulation rate and embryonic survival for seven generations and a contemporary control line. Variance components were obtained by ANOVA and expectations of covariances among relatives and by derivative-free restricted maximum likelihood (DFREML) in an animal model. As a trait of the embryo, heritability of direct effects obtained with ANOVA was 3.8%, heritability of maternal effects was 1.5%, and the genetic correlation between them was -.51. After adjustment of embryonic survival for ovulation rate, lower estimates of each parameter were obtained with ANOVA. Heritability of embryonic survival as a trait of the dam was 9 to 10%. Estimates of heritability of both direct and maternal effects obtained with DFREML were less than 1% and the genetic correlation between them was -.64. When survival of embryos from only those dams with 15 or more ovulations was analyzed, heritability of maternal effects was 4.4%. Estimates of common environmental effects on embryonic survival ranged from 5 to 7%.


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A. Rosendo, T. Druet, J. Gogue, and J. P. Bidanel
Direct responses to six generations of selection for ovulation rate or prenatal survival in Large White pigs
J Anim Sci, February 1, 2007; 85(2): 356 - 364.
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Copyright © 1991 by the American Society of Animal Science.