Article
Breed effects and genetic parameter estimates for calving difficulty and birth weight in a multibreed population.
Journal of animal science - 1 May 2016
Ahlberg C M, Kuehn L A, Thallman R M, Kachman S D, Snelling W M, Spangler M L
Abstract excerpt
Birth weight (BWT) and calving difficulty (CD) were recorded on 4,579 first-parity females from the Germplasm Evaluation Program at the U.S. Meat Animal Research Center (USMARC). Both traits were analyzed using a bivariate animal model with direct and maternal effects. Calving difficulty was transformed from the USMARC scores to corresponding -scores from the standard normal distribution based on the incidence...
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