BALASUBRAMANIAM, SIVAMANI, MOHAN SINGH, G R GOWANE, and S KUMAR. 2013. “Estimate of Genetic and Non-Genetic Parameters and Trends for Age at First Calving in Sahiwal Cows”. The Indian Journal of Animal Sciences 83 (9). https://epubs.icar.org.in/index.php/IJAnS/article/view/33033.