This text book is on the basis of Dairy Cattle reproductive and lactation performances. The book has been published on the basis of detail research works on the representative of developing world, which have been crucial for teaching learning process. It highlights, to acquire knowledge; skill and attitude for students as well as dairy owners. It acquaints dairy owners, stake holders and students with basic principles of dairy cattle production. It introduces dairy cattle age at first breeding, age at first calving, lactation yield, daily yield, number of calves born from each dairy cow, conception rate, number of services per conception, reproductive efficiency on the developing world dairy cows as to how to be evaluated. . It describes constraints of dairy farming as well. It covers also tropical livestock unit holding in the developing world representatives. It depicts conversion factors of all livestock holding in the house hold from all types of animals. This book is very critical in filling the gap for academicians, dairy cow owners as well as students in the area of dairy cattle reproductive lactation performance evaluation and management.