TY - JOUR
T1 - Interrelationships of Milk Yield, Body Weight, and Reproductive Performance
AU - Badinga, L.
AU - Collier, R. J.
AU - Wilcox, C. J.
AU - Thatcher, W. W.
PY - 1985
Y1 - 1985
N2 - Records (2263) from a single north Florida herd for 3 yr were evaluated in a series of analyses. Environment was sub-tropical. Data set included only cows that had normal milk records and became pregnant. Holsteins and Jerseys averaged 6799 and 4504 kg milk, 587 and 418 kg postpartum body weight, 164 and 141 days open, and 2.3 and 2.1 services per subsequent pregnancy. Pooled within breed, repeatabilities and heritabilities of these performance measures were .37, .15; .53, .25; .20, .06; and .30, 0. Estimable genetic correlations were milk yield and body weight −.09, milk yield and services per conception .38, and services per conception and body weight .37; range of standard errors was .22 to .39. Substantial genetic antagonism may exist between milk yield and body weight, and efficient reproduction. If results of this research are verified elsewhere, breeders should be aware that selection for increased weight could lead to decreased reproductive efficiency.
AB - Records (2263) from a single north Florida herd for 3 yr were evaluated in a series of analyses. Environment was sub-tropical. Data set included only cows that had normal milk records and became pregnant. Holsteins and Jerseys averaged 6799 and 4504 kg milk, 587 and 418 kg postpartum body weight, 164 and 141 days open, and 2.3 and 2.1 services per subsequent pregnancy. Pooled within breed, repeatabilities and heritabilities of these performance measures were .37, .15; .53, .25; .20, .06; and .30, 0. Estimable genetic correlations were milk yield and body weight −.09, milk yield and services per conception .38, and services per conception and body weight .37; range of standard errors was .22 to .39. Substantial genetic antagonism may exist between milk yield and body weight, and efficient reproduction. If results of this research are verified elsewhere, breeders should be aware that selection for increased weight could lead to decreased reproductive efficiency.
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U2 - 10.3168/jds.S0022-0302(85)81034-1
DO - 10.3168/jds.S0022-0302(85)81034-1
M3 - Article
C2 - 4031196
AN - SCOPUS:0022091135
SN - 0022-0302
VL - 68
SP - 1828
EP - 1831
JO - Journal of dairy science
JF - Journal of dairy science
IS - 7
ER -