Effect of Incomplete Pedigrees on Estimates of Inbreeding and Inbreeding Depression for Days to First Service and Summit Milk Yield in Holsteins and Jerseys From: Journal of Dairy Science | Date: September 1, 2003| Author: Cassell, B G; Adamec, V; Pearson, R E | Copyright American Dairy Science Association Sep 2003. Provided by ProQuest LLC.Copyright information

ABSTRACT

A method to measure completeness of pedigree information is applied to populations of Holstein (registered and grade) and Jersey (largely registered) cows. Inbreeding coefficients where missing ancestors make no contribution were compared to a method using average relationships for missing ancestors. Estimated inbreeding depression was from an animal model that simultaneously adjusted for breeding values. Inbreeding and its standard deviation increased with more information, f...