Nonreturn Rate of Artificially Inseminated Dairy Cows as Affected by Age of Semen, Breed of Bull, and Season
Open Access
- 1 July 1958
- journal article
- research article
- Published by American Dairy Science Association in Journal of Dairy Science
- Vol. 41 (7), 987-993
- https://doi.org/10.3168/jds.s0022-0302(58)91033-6
Abstract
The percentage of nonreturns declined in an essentially linear manner. The rate of decline varied from 5 to 11 percentage points for each additional day of age of the semen, depending on breed. Breeds ranked in the following order of decreasing efficiency: Holstein, Brown Swiss, Jersey, Ayrshire, Guernsey, Milking Shorthorn. The decline in nonreturn rate with the age of the semen was least in the winter, and essentially the same during the other 3 seasons.This publication has 14 references indexed in Scilit:
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