Crossbreeding involving Bos Taurus cattle breeds with native descriptive and non descriptive cattle population was introduced in India nearly half a century ago with the aim to quick gains in milk production. Undoubtedly, there was a rapid rise in milk production making India the largest milk producer in the world. However, crossbreeding affected the bovine population in general and native breeds in particular in various ways leaving problems and unsolved question. This book is a maiden attempt to systematically review the performance of crossbred bulls in the tropics based on nearly fifty years of Indian experience and highlights various problems and researchable issues concerning crossbred bulls. It discusses the adoption, constraints, and implications of castle breeding policy in India, and highlights various problems and researchable issues concerning crossbred bulls. The book is intended as a teaching text for Graduate and Post Graduate students in the disciplines of Animal Reproduction, Physiology, and Gynecology and as a referral source for scientists and research scholars.

Contents: 1. Cattle breeding policy past and present, crossbreeding status and issues. 2. Seminal attributes of breeding bulls with special reference to crossbreds. 3. Factors affecting semen quality. 4. Reproductive performance and reproductive wastage in crossbred bulls. 5. Cryo preservation cryo injury and freezability of Semen. 6. Techniques to improve semen quality. 7. Status of semen transmissible and other genital diseases in the breeding bulls. 8. Standard practices for bull semen stations. 9. Synthesis of a crossbred cattle strain experience on males. 10. Appendix. Subject Index.