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The yakalo is a cross of the yak (Bos grunniens) and the American bison (Bison bison, known as a buffalo in North America). It was produced by hybridisation experiments in the 1920s, when crosses were made between yak bulls and both pure bison cows and bison–cattle hybrid cows. As with many other inter-specific crosses, only female hybrids were found to be fertile (Haldane's rule). Few of the hybrids survived, and the experiments were discontinued in 1928.
Deakin, A., Muir, G. W., Smith, A. G. (1935). "Hybridization of domestic cattle, bison and yak. Report of Wainwright experiment". Publication 479, Technical Bulletin 2, Dominion of Canada, Department of Agriculture, Ottawa; cited in: Zhang, R. C. "Interspecies Hybridization between Yak, Bos taurus and Bos indicus and Reproduction of the Hybrids" (14 Dec 2000). In: Recent Advances in Yak Reproduction, Zhao X. X. and Zhang R. C. (Eds.). International Veterinary Information Service.
Deakin, A., Muir, G. W., Smith, A. G. (1935). "Hybridization of domestic cattle, bison and yak. Report of Wainwright experiment". Publication 479, Technical Bulletin 2, Dominion of Canada, Department of Agriculture, Ottawa; cited in: Weiner, Gerald (2003). The Yak, Second Edition, FAO RAP Publication, pp. 18, 338.
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