American bison, yak, Scottish Highland and Hereford calves were used in a comparative study of metabolic responses to temperature of 20, 0 and -30°C. Metabolic rates were lowest in the bison, highest in the Herefords and intermediate in the Highland and yak. Przeprowadzono porównawcze badania nad zapotrzebowaniem energetycznym u bizona, jaka oraz bydła (ras - Scottish Highland i Hereford) w temperaturach 20, 0 i -30°C (Tabela 1). Tempo metabolizmu było najniższe u bizona, najwyższe u bydła rasy Hereford, a pośrednie u jaka i bydła rasy Scottish Highland (Tabela 2).
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Christopherson et al. (1978) studied this question.
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