* _A Manual of Cattle Breeding and Management_ by William Youatt
* _Reproduction in Cattle_ by Randal S. Ott
* _Dairy Cattle Genetics and Breeding_ by David E. Beever
* Journal articles: Scientific journals are a great source of information on the latest research in cow breeding. Some relevant journals include:
* _Journal of Dairy Science_
* _Theriogenology_
* _Animal Genetics_
* Online resources: There are also many helpful online resources available on the topic of cow breeding. Some good places to start include:
* The Dairy Cattle Info Center (DCIC)
* The Holstein Association USA
* The National Milk Producers Federation
* University extension offices: Your local university extension office may also have resources available on cow breeding. Contact them to see what they have available.