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首页> 外文期刊>Canadian Journal of Zoology >Effects of experimental food restriction and body-mass changes on theavian T-cell-mediated immune response
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Effects of experimental food restriction and body-mass changes on theavian T-cell-mediated immune response

机译：实验性食物限制和体重变化对T细胞介导的免疫反应的影响

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摘要

The T-cell-mediated immune response (CMI) of birds, measured with the phytohaemagglutinin skin test, is in most cases positively correlated with their body mass. This correlation, however, does not imply causality, since high-quality birds may be more immunocompetent as well as heavier at the time of sampling. We assessed this relationship experimentally by measuring the changes in body mass and CMI in individual captive yellow-legged gulls (Larus cachinnans) maintained with food provided ad libitum (control group), with no food (fasting group), or with one-third of their daily food requirements (subfeeding group). We identified a direct, nonlinear relationship between food intake, body mass, and CMI. Before the experiment started, body mass of birds (corrected for size) fed ad libitum did not correlate with their CMI, while a positive correlation was found after food restriction. This suggests that birds may reach a threshold above which increases in food intake and body mass do not enhance CMI. Thereafter, food restriction caused decreases in CMI that were significantly correlated with the percentage of body mass lost by each bird. However, for birds that lost similar. proportions of body mass, changes in CMI varied according to food-restriction treatment, the subfeeding group exhibiting a stronger CMI than the fasting group.
机译：在大多数情况下，通过植物血凝素皮肤试验测得的鸟类的T细胞介导的免疫反应（CMI）与它们的体重呈正相关。但是，这种相关性并不意味着因果关系，因为高质量的鸟类在采样时可能具有更高的免疫能力以及更重的免疫力。我们通过测量随意饲养的食物（对照组），不食用食物（禁食组）或三分之一的食物中饲养的单个圈养黄腿鸥（黑嘴鸥）的体重和CMI的变化，通过实验评估了这种关系。他们的日常食物需求（分喂组）。我们确定了食物摄入量，体重和CMI之间的直接非线性关系。在实验开始之前，随意喂养的鸡的体重（校正大小）与他们的CMI不相关，而在禁食后发现正相关。这表明家禽可能达到一个阈值，在该阈值之上，食物摄入量和体重增加不会提高CMI。此后，食物限制导致CMI下降，这与每只鸡损失的体重百分比显着相关。但是，对于失去的鸟类也是如此。体重比例，CMI的变化因食物限制处理而异，分食组的CMI比禁食组强。

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