Development of an animal model for across-herd genetic evaluation of number born alive in swine.

  title={Development of an animal model for across-herd genetic evaluation of number born alive in swine.},
  author={Brent W Woodward and John W. Mabry and Miles Todd See and J Keith Bertrand and L. L. Benyshek},
  journal={Journal of animal science},
  volume={71 8},
An animal model and computer software were developed to conduct across-herd genetic evaluations using data from producers participating in the Sow Productivity Index program of the American Yorkshire Club. The final data set consisted of 61,596 litter records from 1986 to early 1990. The animal model included fixed contemporary group effects and random additive direct, service sire, permanent environmental, and residual effects. Additive genetic relationships among animals were included. A… 

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