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轻柔接触对犊牛的易操作性、福利和生长以及小牛肉品质的影响。

The impact of gentle contacts on ease of handling, welfare, and growth of calves and on quality of veal meat.

作者信息

Lensink B J, Fernandez X, Boivin X, Pradel P, Le Neindre P, Veissier I

机构信息

INRA, Centre de Clermont-Ferrand-Theix, Unité de Recherches sur les Herbivores, Sainte-Genès Champanelle, France.

出版信息

J Anim Sci. 2000 May;78(5):1219-26. doi: 10.2527/2000.7851219x.

Abstract

It has been demonstrated previously that regularly stroking and letting calves suck fingers leads to less avoidance and more approach behavior of the calves toward people. To examine whether these positive contacts affect the welfare and productivity of calves and the quality of veal meat we used 22 veal calves housed in individual crates. Half of them received minimal contact with the stockperson (controls), and the other half were given additional gentle contacts around meals, by stroking the calves and allowing them to suck the stockperson's fingers, during the entire fattening period (21 wk). Welfare was assessed through behavioral reactivity (reactions to handling, to surprise stimuli, and to novelty), neuroendocrine responses to stress (cortisol in response to an ACTH challenge, catecholamine-synthesizing enzymes), and health (number of medical treatments, abomasal lesions). Calf productivity was assessed through growth rates and meat quality through glycolytic potential (an estimator of resting glycogen level in muscle), pH, and color. Calves that received gentle contacts were less agitated (P < .01) and tended to defecate less (P = .08) when handled in a cart on wheels than the control calves, but no treatment effects were found in reactivity to novelty and surprise stimuli, responses to ACTH, and catecholamine synthetic potential. Calves given gentle contacts had fewer abomasal lesions than controls (0/11 vs 4/11, P = .05). The glycolytic potential of the semimembranosus muscle was higher in calves that received gentle contacts than in controls (172.6 vs 154.1 micromol/g, P < .05), but no treatment effects were observed on meat pH, meat color, or growth rates. It is concluded that gentling veal calves reduces their reactions to handling. Gentle contacts reduce the reaction to transport shown by differences in glycolytic potential. In addition, the reduction in reactions to handling and the decreased incidence of abomasal lesions can contribute to an improvement of the calves' welfare.

摘要

先前已经证明,定期抚摸并让小牛吮吸手指会使小牛对人的回避行为减少,接近行为增多。为了研究这些积极接触是否会影响小牛的福利、生产力以及小牛肉的品质,我们选用了22头单独饲养在栏舍中的小牛。其中一半小牛与饲养员的接触极少(对照组),另一半小牛在整个育肥期(21周)内,在进餐前后会得到额外的轻柔接触,即抚摸小牛并让它们吮吸饲养员的手指。通过行为反应性(对处理、意外刺激和新奇事物的反应)、对应激的神经内分泌反应(促肾上腺皮质激素刺激后的皮质醇、儿茶酚胺合成酶)以及健康状况(医疗治疗次数、皱胃损伤情况)来评估福利。通过生长速度评估小牛的生产力,通过糖酵解潜力(肌肉中静息糖原水平的估计值)、pH值和颜色评估肉质。与对照组小牛相比,接受轻柔接触的小牛在被放在轮式推车中搬运时,躁动程度更低(P < .01),排便次数也较少(P = .08),但在对新奇事物和意外刺激的反应、对促肾上腺皮质激素的反应以及儿茶酚胺合成潜力方面未发现处理效应。接受轻柔接触的小牛皱胃损伤比对照组少(0/11 对 4/11,P = .05)。接受轻柔接触的小牛半膜肌的糖酵解潜力高于对照组(172.6 对 154.1微摩尔/克,P < .05),但在肉的pH值、肉色或生长速度方面未观察到处理效应。研究得出结论,对小牛进行安抚可降低它们对处理的反应。轻柔接触通过糖酵解潜力的差异降低了对运输的反应。此外,对处理反应的降低和皱胃损伤发生率的减少有助于改善小牛的福利。

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