Logistic analysis of lactation stage influence on probability of milk fat depression in Iranian Holstein cows

Document Type : Research Paper

Author

Associate Professor, Department of Animal Science, University of Birjand, Iran

Abstract

To evaluate the effect of lactation stage on milk fat depression (MFD) a total of 938,047 test day records
belonging to 108,077 first parity Iranian Holstein cows calving between 1995 and 2009 and distributed in 427 herds
were used. Bassed on fat% to protein% ratio for each test day record, and the threshold point of -0.12, dependent
variable was defined (codes 0 and 1 for the non- incidence and incidence of MFD, respectively). The data were
analysed with a logistic generalized linear mixed model using GLIMMIX procedure of SAS software. In the model,
fixed effects of stage of lactation, production season, sperm type used for dam insemination, age at first calving,
animal type (grade or pure Holstein) and calving year, as well as random effect of sire were included. Mean
probability of MFD increased from the beginning (0.1989) towards the middle (0.3192) of the lactation and
afterwards it decreased. The maximum odds ratio (1.313) was obtained for MFD at the fifth month of lactation as
compared to the last lactation month. With respect to the results, it could be therefore concluded that more economic
return may be obtained through paying more attention to the nutrition regime of dairy cows.

Keywords

References

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Animal Production Research
Volume 1, Issue 2 - Serial Number 2
September 2012
Pages 21-31

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