1. Alawneh, J. I., Laven, R. A. and Stevenson, M. A., 2011. The effect of lameness on the fertility of dairy cattle in a seasonally breeding pasture-based system. Journal of Dairy Science, 94, 5487–5493.
2. Bahonar, A. R., Azizzadeh, M., Stevenson, M. A., Vojgani, M. and Mahmoudi, M., 2009. Factors affecting days open in Holstein dairy cattle in Khorasan Razavi province, Iran; a cox proportional hazard model. Journal of Animal and Veterinary Advances, 8, 747–754.
3. Brown, H. and Prescott, R., 1999. Applied mixed models in medicine. John Wiley and Sons, Ltd., Chichester, UK.
4. Berry, D. P., Buckley, F., Dillon, P., Evans, R. D., Rath, M. and Veerkamp, R. F., 2003. Genetic relationships among body condition score, body weight, milk yield, and fertility in dairy cows. Journal of Dairy Science, 86, 2193–2204.
5. Darwash, A. O., Lamming, G. E. and Woolliams, J. A., 1997. The phenotypic association between the interval to post-partum ovulation and traditional measures of fertility in dairy cattle. Animal Science, 65, 9–16.