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首页> 外文OA文献 >A comparison of temperature regulation in neonatal and adult hispid cotton rats, Sigmodon hispidus texianus, from southern Texas and northern Kansas
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A comparison of temperature regulation in neonatal and adult hispid cotton rats, Sigmodon hispidus texianus, from southern Texas and northern Kansas

机译：来自德克萨斯州南部和堪萨斯州北部的新生和成年组棉大鼠Sigmodon hispidus texianus温度调节的比较

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摘要

Thermoregulatory abilities were examined in laboratory-reared neonatal and adult hispid cotton rats, Sigmodon hispidus texianus, from northern Kansas and south-central Texas. These regions are representative of the northern and southern areas of the distribution of the subspecies;Rectal body temperature (T(,b)), O(,2) consumption and total conductance were noted in 1- to 18-day-old rats exposed, individually, to ambient temperatures (T(,a)) of 0-35 C. No differences were found between the thermoregulatory responses of Kansas or Texas neonates. One- to 3-day-old neonates have T(,b)\u27s which are 2-10 C above T(,a). Total conductance is highest in 1- to 3-day-olds due to the sparse amount of fur. After day 4, neonates are capable of homeothermy at T(,a)\u27s above 20 C. Between days 5-13, a progressive increase occurs in the capability to maintain homeothermy at increasingly lower T(,a)\u27s. At the same time, O(,2) consumption increases at lower T(,a)\u27s and decreases at higher T(,a)\u27s. Total conductance decreases at all T(,a)\u27s by the 13th day of life. From days 14-18, rates of O(,2) consumption and total conductance decrease at T(,a)\u27s below thermoneutrality. Capability of individuals to thermoregulate appears to be more closely related to age than to body size. Litters of 4 neonates enclosed in a cotton nest and exposed to 0 C were determined to maintain homeothermic T(,b)\u27s by the 3rd day of life;Thermoregulatory responses of Kansas and Texas adults subjected to T(,a)\u27s of 0-40 C were significantly different. Kansas animals had a basal metabolic rate (BMR) of 0.83 ml O(,2)/g(.)h(.) which is 85 % of the value predicted by weight. The BMR of Texas animals is 103 % of the value predicted by weight and is significantly higher than that determined for Kansas animals. Thermoneutral zones are between 29.5-33.7 C and 33.5-35 C in Kansas and Texas animals, respectively. Total and dry conductances are significantly lower in Kansas animals. Total conductances for both Kansas (0.078 ml O(,2)/g(.)h(.)(DEGREES)C) and Texas (0.082 ml O(,2)/g(.)h(.)(DEGREES)C) animals are higher than values predicted by body weights (113 % and 115 %, respectively). Body temperature is similar (38.1 C) at T(,a)\u27s below 35 C in both Kansas and Texas animals. Evaporative water loss is similar at all T(,a)\u27s below 40 C. However, Kansas animals when exposed to 40 C, salivated profusely and spread saliva about the entire body surface. Texas animals exhibited no such behavior. The percent of endogenous heat dissipated by evaporative water loss is significantly greater in Kansas animals than in Texas animals.
机译：在堪萨斯州北部和得克萨斯州中南部的实验室饲养的新生和成年组棉大鼠Sigmodon hispidus texianus中检测了体温调节能力。这些区域代表了亚种分布的北部和南部区域;在暴露的1至18天大的大鼠中注意到了直肠的体温（T（，b）），O（，2）消耗和总电导率分别达到0-35 C的环境温度（T（，a））。堪萨斯州或德克萨斯州新生儿的温度调节反应之间未发现差异。 1至3天大的新生儿的T（，b）高于T（，a）2-10C。由于皮毛稀少，总电导率在1-3天大的儿童中最高。在第4天后，新生儿能够在高于20 C的T（，a）上进行同温疗法。在第5-13天之间，保持同温的能力逐渐提高，使T（，a）更低。同时，O（，2）消耗在较低的T（，a）\ u27s处增加，而在较高的T（，a）\ u27s处减少。在生命的第13天，所有T（，a）的总电导都减小。从第14天到第18天，O（，2）的消耗速率和总电导率在低于热中性的T（，a）处降低。个人的体温调节能力似乎与年龄而不是与体型密切相关。确定在出生后第3天将4只新生儿的产仔放在棉窝中并暴露在0 C下以维持体温T（，b）\ u27s;堪萨斯州和德克萨斯州成年人的T（，a）\ u27s的热调节反应0-40 C差异显着。堪萨斯州动物的基础代谢率（BMR）为0.83 ml O（，2）/ g（。）h（。），占体重预测值的85％。得克萨斯州动物的BMR值是体重预测值的103％，大大高于堪萨斯州动物的BMR值。在堪萨斯州和德克萨斯州的动物中，热中性区分别在29.5-33.7 C和33.5-35 C之间。堪萨斯州动物的总电导率和干电导率明显较低。堪萨斯州（0.078 ml O（，2）/ g（。）h（。）（DEGREES）C）的总电导）的动物高于体重预测的值（分别为113％和115％）。在堪萨斯州和德克萨斯州的动物中，低于35摄氏度的T（，a）处的体温相似（38.1摄氏度）。低于40°C的所有T（a）的蒸发水分损失都相似。但是，堪萨斯州的动物暴露于40°C时会大量流涎并将唾液散布到整个身体表面。德克萨斯州的动物没有这种行为。堪萨斯州动物因蒸发失水而耗散的内源性热量所占百分比显着大于德克萨斯州动物。

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    Scheck, Stephen Henderson;

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  • 年度 1980
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  • 正文语种 en
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