ORIGINAL PAPER
The use of early lactation milk protein content
to predict subsequent fertility performance and
likelihood of culling, in commercial dairy cows
| 1 | Michoacan University of Saint Nicolas of Hidalgo,
Morelia-Zinapecuaro Road, km. 9.5 Tarímbaro, Michoacan 58880, Mexico |
| 2 | Veterinary Epidemiology and Economics Research Unit (VEERU), School of Agriculture,
Policy and Development, University of Reading,
P.O. Box 237, Reading RG6 6AR, United Kingdom |
CORRESPONDING AUTHOR
D. Val-Arreola
Michoacan University of Saint Nicolas of Hidalgo, Morelia-Zinapecuaro Road, km. 9.5 Tarímbaro, Michoacan 58880, Mexico
Michoacan University of Saint Nicolas of Hidalgo, Morelia-Zinapecuaro Road, km. 9.5 Tarímbaro, Michoacan 58880, Mexico
Publication date: 2009-03-20
J. Anim. Feed Sci. 2009;18(2):209–220
KEYWORDS
ABSTRACT
A dataset of 1,846,990 completed lactation records was created using milk recording data
from 8,967 commercial dairy farms in the United Kingdom over a five year period. Herd-specific
lactation curves describing levels of milk, fat and protein by lactation number and month of calving
were generated for each farm. The actual yield of milk and protein proportion at the first milk
recording of individual cow lactations were compared with the levels taken from the lactation curves.
Logistic regression analysis showed that cows producing milk with a lower percentage of protein
than average had a significantly lower probability of being in-calf at 100 days post calving and a
significantly higher probability of being culled at the end of lactation. The culling rates derived from
the studied database demonstrate the current high wastage rate of commercial dairy cows. Much of
this wastage is due to involuntary culling as a result of reproductive failure.
CITATIONS (3):
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Daniel Chiumia, Mizeck G.G. Chagunda, Alastair I. Macrae, David J. Roberts
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Factors influencing pregnancy per artificial insemination in repeat-breeder cows induced to ovulate with a CIDR-based protocol
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