The cold (max. temp, below 26 °C) and upper reaches (4000 to 6000 meters above sea level) of the Himalayas seem to be the exclusive preserves of the yak (Bos grunniens) (Figs. 1 and 2), a close relative of our domestic cattle zebu (Bos indicus) (Fig. 3). Known to be the heaviest among the cattle species, the yaks get reduced in size on domestication. The female called «Breme» in the native language, contains as high as or even higher than 12 % fat in its milk (the highest fat content in the mammalian milk). The female being more sensitive in adaptability than the yak, the term commonly used for the male counterpart, loses its fecundity at the lower altitudes with warmer climate. Maintenance of this thermal sensitive species at other locations, therefore, poses a problem.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 3, Madrid, Spain, 723–730, 1974
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