1. Animal Improvement Programs Laboratory 2012. Averages of DHI cow herds by breed and test-plan category. Retrieved 25 February 2013, from http://aipl.arsusda.gov/publish/dhi/current/hax.html
2. Comparative reproductive performance and early lactation productivity of Jersey×Holstein cows in predominantly Holstein herds in a pasture based dairy system;Auldist;Journal of Dairy Science,2007
3. Milk production, udder health, body condition score and fertility performance of Holstein-Friesian, Norwegian Red and Norwegian Red×Holstein-Friesian cows on Irish dairy farms. In Breeding for robustness in cattle;Begley;EAAP Scientific Series,2009
4. Genetic relationships among body condition score, body weight, milk yield and fertility in dairy cows;Berry;Journal of Dairy Science,2003
5. Buckley F and Shalloo L 2009. Crossbreeding – Is it more profitable? Proceedings of the Teagasc National Dairy Conference, 18 November, Mullingar, Co. Westmeath, pp. 93–104.