Uniform guidelines for objective evaluation and recording of swine performance have been outlined by the National Swine Improvement Federation. Number of piglets born alive, 21-day litter weight, backfat, and age to 230 pounds (104 kg) have been selected as traits indicating overall animal fitness and combined into indexes for selecting herd replacements.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume X. Breeding programs for swine, poultry, and fish., , 199–204, 1986
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