[1]Department of Veterinary Gynaecology and Obstetrics Guru Angad Dev Veterinary and Animal Sciences University Ludhiana141004 Punjab India;
[2]Department of Buffalo Physiology and Reproduction Central Institute for Research on Buffalo Hisar125001 Haryana India;
[3]Livestock Farms Complex Guru Angad Dev Veterinary and Animal Sciences University Ludhiana141004 Punjab India;
Buffalo bulls; Freezing rate; Critical temperature range; Programmed freezing;