Document Type: Original Article

Authors

1 Department of Food Hygiene and Quality Control, Faculty of veterinary medicine, University of Tehran, Tehran, Iran.

2 Department of Food Hygiene and Public Health, Faculty of Veterinary Medicine, Shahid Bahonar University of Kerman, Kerman, Iran and Research Center for Modeling in Health, Kerman University of Medical Sciences, Kerman, Iran.

3 Department of Clinical Science, Faculty of veterinary medicine, University of Tehran, Tehran, Iran.

4 Department of Epidemiology & Biostatistics, School of Hygiene, Tehran University of Medical Sciences, Tehran, Iran.

5 Research Center for Modeling in Health, Kerman University of Medical Sciences, Kerman, Iran.

Abstract

Objective-To assess the effect of lameness on culling of dairy cows in Tehran province.
Design- Historical cohort study.
Study population and procedures- 7067 first- and second-parity Holstein dairy cows that calved from March, 21 2007 to March, 20 2008 were until next calving or culling. Logistic regression was conducted data.
Results-The overall lactational culling rate for eligible cows in the study was 22.09% (95% CI: 19.26-24.9%). Lameness was an important factor in the model and increased odds of culling (OR= 1.32; 95% Confidence interval = 1.15-1.51). Moreover, parity, 60-day cumulative milk yield, and herd size increased culling odds. We did not find evidence for a significant effect of calving season on culling.
Conclusion- Lameness is an important factor in culling decision in dairy herds in this area.

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