Relationships between age at first calving and first lactation milk yield, and lifetime productivity and longevity in dairy cows.

GM, Haworth; WP, Tranter; JN, Chuck; Z, Cheng; DC, Wathes

doi:10.1136/vr.162.20.643

Public

Relationships between age at first calving and first lactation milk yield, and lifetime productivity and longevity in dairy cows.

Shared by NobleBlocks on May 1, 2008 • 12:00 AM UTC

Authors:

Haworth GM

Tranter WP

Chuck JN

Abstract

Lifetime records of 442 Holstein cows on one farm in North Queensland, Australia, were analysed to evaluate the effects of age at first calving (AFC) and first lactation milk yield on parities per lifetime, longevity, milk yield in subsequent lactations, lifetime milk production and the longevity in...

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