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首页> 外文期刊>Zoological Science >Secretion patterns of growth hormone in growing captive mithuns (Bos frontalis).
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Secretion patterns of growth hormone in growing captive mithuns (Bos frontalis).

机译：笼养的线粒体（Bos frontalis）中生长激素的分泌模式。

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摘要

A study was conducted in May 2003 to characterize plasma growth hormone (GH) pattern in growing mithuns (Bos frontalis), a rare semi-wild ruminant. Six mithun calves averaging 235 day of age and 124 kg were maintained in semi-intensive system and group-fed once daily. Animals gained at a mean rate of 0.54 kg/day, with individuals ranging from 0.34 to 0.66 kg/day. Blood samples collected at 15-minute intervals starting from 0600 h for nine-hour period were assayed for plasma GH. Growth hormone patterns consisted of frequent pulses of varying amplitude. Growth hormone pulses occurred at an average frequency of 0.69/h, the rate did not differ markedly among mithuns nor hour of day. The magnitude of GH secretory pulses varied significantly among mithuns. Growth hormone peaks averaged 95.0 and 45.2 ng/ml in mithuns having the highest and lowest GH peaks, respectively. Peak and mean GH levels were associated positively (r=0.98, P<0.001) and both were associated negatively (r=-0.97 and -0.98, respectively; P<0.01) with rates of gain. Results from the study show that (1) GH peaks occur at frequent intervals throughout the sampling period and (2) alteration in GH levels and patterns are elicited more by pulse amplitude than frequency modulation.
机译：2003年5月进行了一项研究，以鉴定生长中的稀有半野生反刍动物mithuns（Bos frontalis）的血浆生长激素（GH）模式。在半精养系统中养育了六只平均年龄为235天，124公斤的三头牛，并每天一次喂饲。动物的平均增重率为0.54千克/天，个体的增重范围为0.34至0.66千克/天。从0600 h开始以15分钟为间隔采集血液样本，持续9小时，以检测血浆GH。生长激素模式由振幅变化频繁的脉冲组成。生长激素脉冲以0.69 / h的平均频率发生，该频率在每天或每天的小时数之间没有显着差异。 GH分泌脉冲的量在丝裂霉素之间显着变化。生长激素峰值分别在最高和最低GH峰的mithuns中平均分别为95.0和45.2 ng / ml。峰值和平均GH水平与增高率呈正相关（r = 0.98，P <0.001），而两者均呈负相关（r = -0.97和-0.98; P <0.01）。研究结果表明：（1）GH峰在整个采样期间以频繁的间隔出现，并且（2）GH电平和模式的变化更多地是由脉冲幅度而不是频率调制引起的。

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