Phenotypic Trends in Herdlife of Dairy Cows in the United States
Open Access
- 1 March 1989
- journal article
- research article
- Published by American Dairy Science Association in Journal of Dairy Science
- Vol. 72 (3), 726-736
- https://doi.org/10.3168/jds.s0022-0302(89)79166-9
Abstract
Herdlife through eighth parity of dairy cows in the United States was studied with lactation records from 87,756 Ayrshires, 108,733 Brown Swiss, 331,497 Guernseys, 294,195 Holsteins (sample of every 15th herd), and 421,911 Jerseys that first calved after 1965. Only cows not sold for dairy purposes and from herds that provided an opportunity for subsequent calving were included. Average survival rates were about 78% to second, 57% to third, 40% to fourth, 27% to fifth, 17% to sixth, 10% to seventh, and 5% to eighth parities. Survival rates were higher for registered cows than for grades for all parities and breeds. Average number of parities was 3.3 for Ayrshires, 3.4 for Brown Swiss, 3.1 for Guernseys, 3.4 for Holsteins, and 3.5 for Jerseys; average productive herdlife was 37.7, 39.4, 34.6, 38.4, and 39.4 mo. Distribution of parities within herds was similar for all breeds: 31% first lactations, 23% second, 17% third, 12% fourth, 8% fifth, 5% sixth, 3% seventh, and 1% eighth. Jerseys had upward trends for survival rate and herdlife over time; other breeds generally had downward trends. Because data from only the first eight parities were included, average number of parities and average herdlife were underestimated slightly.This publication has 22 references indexed in Scilit:
- Comparison of Culling Rates, Reasons for Disposal, and Yields for Registered and Grade Holstein CattleJournal of Dairy Science, 1987
- Evaluation of Sires for Traits Associated with Herdlife of Grade and Registered Holstein CattleJournal of Dairy Science, 1987
- Profitability of Dairy Cow Herd LifeJournal of Dairy Science, 1984
- Estimation of Genetic Trends and Correlations for Jersey CattleJournal of Dairy Science, 1983
- Relationship Between Milk and Fat Production, Type, and Stayability in Holstein Sire EvaluationJournal of Dairy Science, 1982
- Production and Stayability Trends in Dairy CattleJournal of Dairy Science, 1976
- Relationships among Type, Production, and Stayability in Holstein CattleJournal of Dairy Science, 1976
- CANADIAN DAIRY COW DISPOSALS: II. EFFECT OF HERD SIZE AND PRODUCTION LEVEL ON DAIRY COW DISPOSAL PATTERNSCanadian Journal of Animal Science, 1971
- Age Distribution and Herd Life Expectancy in Iowa Dairy HerdsJournal of Dairy Science, 1970
- Expectation of Life in Dairy CowsJournal of Dairy Science, 1939