Impact of Age at Calving on Lactation, Reproduction, Health, and Income in First-Parity Holsteins on Commercial Farms

Frans Ettema, Jehan; Santos, J.E.P.

doi:10.3168/jds.s0022-0302(04)73400-1

Public

Impact of Age at Calving on Lactation, Reproduction, Health, and Income in First-Parity Holsteins on Commercial Farms

Published in Journal of Dairy Science • Aug 1, 2004

Authors:

Jehan Frans Ettema

J.E.P. Santos

Abstract

The objective was to examine milk production, health, and economic performance among Holstein heifers during first lactation on 3 commercial dairy farms in California. Heifers (n = 1905) were moved to the breeding group between 360 and 390 d of age and grouped retrospectively according to age at fir...

Subject

Ice calving

Culling

Lactation

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