Ousey J C, McArthur A J, Rossdale P D
Beaufort Cottage Stables, Newmarket, Suffolk, U.K.
J Reprod Fertil Suppl. 1991;44:561-70.
Metabolic rates, rectal temperatures and respiratory quotients (RQ) were determined during the first 24 h post partum in Thoroughbred and pony foals and in relation to environmental temperature. Both breeds had high metabolic rates (greater than 200 W/m2) during the first hour post partum when they were wet and shivering; by 4 to 24 h values were fairly steady at about 153 and 105 W/m2 for Thoroughbred and pony foals, respectively. At birth, rectal temperature was lower in Thoroughbred foals than in pony foals; values increased during the first hour, and then decreased. At 24 h of age, both breeds had a rectal temperature of 38.4 degrees C. RQ values were high (greater than 0.9) at birth in both breeds, declining to about 0.82 by 4 to 24 h of age. At similar environmental temperatures, the metabolic rates per unit area of Thoroughbred foals were higher than those of pony foals at all ages. The results indicate that breed differences may exist between the thermal responses of newborn Thoroughbred and pony foals.
在纯种马驹和矮种马驹产后的头24小时内，测定了它们的代谢率、直肠温度和呼吸商（RQ），并研究了其与环境温度的关系。两个品种在产后第一小时被毛湿润且颤抖时，代谢率都很高（大于200 W/m²）；到4至24小时时，纯种马驹和矮种马驹的代谢率分别稳定在约153 W/m²和105 W/m²。出生时，纯种马驹的直肠温度低于矮种马驹；温度在第一小时内升高，然后下降。在24小时龄时，两个品种的直肠温度均为38.4摄氏度。两个品种出生时的呼吸商值都很高（大于0.9），到4至24小时龄时降至约0.82。在相似的环境温度下，纯种马驹在各年龄段的单位面积代谢率均高于矮种马驹。结果表明，新生纯种马驹和矮种马驹的热反应可能存在品种差异。
