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首页> 外文期刊>Canadian Journal of Physiology and Pharmacology >Postnatal changes in regional blood flow during cold-induced shivering in sow-reared piglets.
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Postnatal changes in regional blood flow during cold-induced shivering in sow-reared piglets.

机译：母猪饲养小猪冷诱导干sh期间产后局部血流的变化。

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摘要

To determine whether newborn pigs are able to display adequate cardiovascular adjustments favouring shivering thermogenesis in skeletal muscles soon after birth, regional blood flow and fractional distribution of cardiac output were determined in 1-day-old (n = 6) and 5-day-old (n = 6) conscious piglets at thermal neutrality and during cold exposure, using coloured microspheres. Five-day-old piglets stayed with the sow before the experiment. The cold challenge was designed to induce a similar increase (approximately +90%) in heat production at both ages. Skeletal muscle blood flow increased with both age (p < 0.05) and cold exposure (p < 0.001), with the effect of cold being more pronounced in 5-day-old piglets than in 1-day-old piglets (+60%, p < 0.05). The difference between individual muscles increased with age, with fractional blood flow being 41% higher in rhomboideus than in longissimus thoracis muscle during cold exposure in 5-day-old piglets (p < 0.05). Cardiac output was similar at both ages and increased by 23% in the cold (p < 0.001). At 1 day of age, there was no redistribution of cardiac output among the internal organs during the cold challenge, while at 5 days of age, the increase in muscle fractional blood flow was associated with a reduction (p < 0.05) in the fraction of cardiac output reaching the skin (-24%), the small intestine (-21%), and the liver (-20%). In conclusion, these results suggest that there is a rapid postnatal improvement of cardiovascular adjustments favouring blood perfusion and probably heat production during cold-induced shivering in the most oxidative muscles studied. This cardiovascular response may play a role in the postnatal enhancement of thermoregulation in piglets.
机译：为了确定新生猪是否能够在出生后不久显示出有利于骨骼肌发抖生热的足够的心血管调节能力，分别在1日龄（n = 6）和5日龄中确定区域血流量和心输出量的分数分布（n = 6）使用有色微球在热中性和冷暴露期间有意识的仔猪。五天大的仔猪在实验前与母猪呆在一起。寒冷挑战的目的是在两个年龄段引起相似的热量产生（大约+ 90％）。骨骼肌血流量随年龄（p <0.05）和受冷暴露（p <0.001）的增加而增加，与1天大的仔猪相比，5天大的仔猪的寒冷影响更为明显（+ 60％， p ＜0.05）。在5天大的仔猪冷暴露期间，菱形中的个别肌肉之间的差异随着年龄的增长而增加，菱形中的血流分数比胸大肌中的血流高41％（p <0.05）。两个年龄段的心输出量都相似，感冒时心输出量增加23％（p <0.001）。在1天龄时，冷刺激期间内脏器官之间的心输出量没有重新分配，而在5天龄时，肌肉分数血流量的增加与（P <0.05）分数的降低有关。心输出量达到皮肤（-24％），小肠（-21％）和肝脏（-20％）。总之，这些结果表明，在研究的大多数氧化性肌肉中，冷调节引起的寒战期间，心血管调节在产后迅速改善，有利于血液灌注并可能产生热量。这种心血管反应可能在仔猪的产后温度调节增强中起作用。

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