S Tomar, A K, H N Pandey, and G S Bisht. 2005. “A Derived Selection Criterion for Efficient Selection in Dairy Cattle: Time Taken to Produce One Kg of Milk in First Lactation”. The Indian Journal of Animal Sciences 75 (5). https://epubs.icar.org.in/index.php/IJAnS/article/view/9531.