1. Seasonal variation in the LH release in response to GnRH;Aboul-Ela;Anim. Rep. Sci.,1983
2. Denisov, V.F., 1958. Domestic yaks and their hybrids. Selkhozgiz, Moscow, 116 pp. (fide Animal Breeding Abstracts 28, 214).
3. Hafez, E.S.E., 1987. In: Reproduction in Farm Animals, 5th ed. K.M. Varghese Company, Bombay (Indian Edition).
4. Hedges, S., 2000. Bos Grunniens. In: IUCN2003. 2003 IUCN Red list of Threatened Species.
5. Yield and composition of milk of Himachal yak, yak hybrid and hill cow;Jain;Ind. J. Anim. Sci.,1985