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Changes in reproductive performance in dairy herds using the herd reproductive status system

Changes in reproductive performance in dairy herds using the herd reproductive status system

J. Dairy Sci, 53: 752-756

Data were analysed for 66, 492 cow-months between 1959 and 1967 in herds using the HRS system. The av. number of days non-pregnant for cows conceiving and av. monthly percentage of the herd non-pregnant for more than 100 days (problem cows) decreased over the period from 125 to 105 days and from 13 to 8%, resp. The av. HRS increased from 58 to 74%. Services per conception, av. days non-pregnant for problem cows and av. days non-pregnant for reproductive culls did not change significantly.

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Accession: 014375025

Download citation: RISBibTeXText

DOI: 10.3168/jds.s0022-0302(70)86285-3

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