Relationships between reproduction traits, age and body weight at calving, and days dry in first lactation Ayrshires and Holsteins.

doi:10.3168/jds.S0022-0302(90)78737-1

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Article

Relationships between reproduction traits, age and body weight at calving, and days dry in first lactation Ayrshires and Holsteins.

Journal of dairy science - 1 Mar 1990

Moore R K, Kennedy B W, Schaeffer L R, Moxley J E

Abstract excerpt

Individual cow test day records collected between December 1979 and June 1986 were used to calculate measures of reproductive performance, age and weight at calving, and days dry for 7824 Ayrshire and 79,755 Holstein cows in first lactation. Separate analyses by breed were carried out according t...

Topics

Aging
Animals
Body Weight
Breeding
Cattle
Female
Fertility
Genetic Variation
Lactation
Phenotype

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