Open AccessGENETIC PARAMETERS FOR CALVING EASE IN AYRSHIRES
Author(s) -
R.I. Cue
Publication year - 1990
Publication title -
canadian journal of animal science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1918-1825
pISSN - 0008-3984
DOI - 10.4141/cjas90-007
Subject(s) - heritability , ice calving , sire , herd , zoology , biology , genetic correlation , restricted maximum likelihood , variance components , veterinary medicine , statistics , lactation , maximum likelihood , genetic variation , mathematics , pregnancy , genetics , medicine , gene
Estimates of genetic parameters of calving ease were obtained in Ayrshires. A restricted maximum likelihood model was used with the fixed effects of herd, month-season of calving, sex of calf and dam weight, and the random effect of sire (of calf). The heritability of the direct effect in heifers and in adult cows was approximately 2%, with a genetic correlation between the direct effect in heifers and in adult cows of close to 70%. Key words: Variance, heritability, calving ease, Ayrshire