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Ridewood Wg,. (1901). On the hairs of Equus Burchelli and E. Zebra Proc Zool Soc Lond, 1, 87–88.
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Ridgeway W,. (1909). Contributions to the study of the Equidae; the differentation of the three species of zebras. Proc Zool Soc Lond, , 547–586.
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Robbie J,. (). Wild ass in northern province. Sudan Wild Life & Sport, 26, 27.
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Robertshaw D, T. C. (1969). Sweat gland function of the donkey. J Physiol, 205, 79–89.
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Robinson Dw, S. L. (1974). The current status of knowledge on the nutrition of equines. J Anim Sci, 39, 1045–1066.
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Rodgers Wa,. (1977). Seasonal changes in group size amongst five wild herbivore species. E Afr Wildl J, 15, 175–190.
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ROPIHA RT et al,. (1969). The duration of pregnancy in thoroughbred mares. Vet Rec, 84, 552–555.
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Rossdale Pd,. (1967). Clinical studies on the newborn thoroughbred foal.I. Perinatal behaviour. Brit Vet J, 123, 470–480.
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Rossdale Pd,. (1968). Abnormal perinatal behaviour in the thoroughbred horse. Brit Vet J., 124, 540–553.
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Rossdale Pd,. (1968). Perinatal behaviour int the thoroughbred horse. (Vol. Chapt. 15).
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