Improving management for higher reproduction accelerates genetic improvement in closed herd of swine

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2 Citations (Scopus)

Abstract

The present study compared responses to selection at different conception rates and litter sizes at weaning in a simulated closed herd in a swine breeding program. The base population consisted of 10 males and 50 females, and 10 generations of selection was practiced by using individual phenotype or best linear unbiased prediction of breeding values for a trait with heritability (h2) of either 0.2 or 0.5. The probability of conception in a single mating was assumed to be 0.8, 0.9 or 1.0. Litter size at weaning was sampled randomly from a normal distribution with mean 8, 10 or 12 and variance 8.1225. Genetic response increased by approximately 6% for h2 = 0.2 and approximately 5% for h2 = 0.5 at generation 10 when conception rate was increased from 0.8 to 1.0. However, litter size at weaning did not affect response to selection. In conclusion, improving conception rate by environmental management increases genetic response indirectly in a breeding program of a closed swine herd.

Original languageEnglish
Pages (from-to)499-502
Number of pages4
JournalAnimal Science Journal
Volume75
Issue number6
DOIs
Publication statusPublished - 2004 Dec 1
Externally publishedYes

Keywords

  • Closed herd
  • Conception rate
  • Genetic improvement
  • Improving environmental management
  • Swine

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)

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