An Assessment of Stress Status in Fattening Steers by Monitoring Heart Rate Variability: A Case of Dietary Vitamin A Restriction
An Assessment of Stress Status in Fattening Steers by Monitoring Heart Rate Variability: A Case of Dietary Vitamin A Restriction
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DOI：
10.3389/fanim.2021.799289
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发表时间：
2022-01
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影响因子：
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通讯作者：
Kaho Kitajima;K. Oishi;Tomoki Kojima;Shogo Uenishi;Yudai Yasunaka;Koki Sakai;H. Kumagai;H. Hirooka
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文献类型：
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作者：
Kaho Kitajima;K. Oishi;Tomoki Kojima;Shogo Uenishi;Yudai Yasunaka;Koki Sakai;H. Kumagai;H. Hirooka
心率变异性（HRV），心跳到心跳的变化，是心脏自主功能的量度，并且使用传感器技术的HRV监测可以是评估动物压力的非侵入性方式。本研究旨在通过心率变异性（HRV）分析，探讨日粮中限制维生素A（VA）含量以提高牛肉品质对育肥牛生理状态的影响。将6头日本黑阉牛平均分配到VA限制（RES）组和VA补充（RES）组。RES阉牛从11月龄至20月龄饲喂VA限制性饮食。在18月龄和24月龄时测量心搏间期和血VA浓度。心率变异性参数的时间，频率和非线性域计算使用的心跳间隔。在18月龄时，RES阉牛的血液VA浓度显著低于普通阉牛（P < 0.05），但在24月龄时两组之间没有差异。心率变异性分析表明，RES牛的交感神经活性高于普通牛，而副交感神经活性低于普通牛（P < 0.05）。而组龄和年龄对HRV各参数的交互作用显著（P < 0.05），表明18月龄RES阉牛虽有轻度应激反应，但随着血VA浓度的升高，应激反应可恢复到24月龄时与普通阉牛相似的水平。
Heart rate variability (HRV), heart beat-to-beat variations, is a measure of cardiac autonomic functions, and HRV monitoring using sensor technology can be a non-invasive way to assess stress of animals. The objective of this study was to investigate the effect of dietary vitamin A (VA) restriction to enhance beef quality on the physiological status of fattening steers by HRV analysis. Six Japanese Black steers were equally allocated into VA-restricted (RES) and VA-supplemented (SUP) groups. The RES steers were fed VA-restricted diets from 11 to 20 months of age. The inter-beat intervals and blood VA concentration were measured at 18 and 24 months of age. HRV parameters in time, frequency, and non-linear domains were calculated using the inter-beat intervals. Blood VA concentration was significantly lower in RES steers than in SUP steers at 18 months of age (P < 0.05) but did not differ between the groups at 24 months of age. The HRV analysis indicated greater sympathetic and lower parasympathetic activities in RES steers than in SUP steers (P < 0.05). However, there were significant interactions of the group and age on HRV parameters (P < 0.05), indicating that although RES steers at 18 months of age might suffer from slight stress, the response could recover to a level similar to SUP steers at 24 months of age by the increase in blood VA concentration.