Gregory N G, Bell J C
Agricultural and Food Research Council, Institute of Food Research, Langford, Bristol.
Vet Rec. 1987 Dec 12;121(24):567-9.
Shackling can induce wing flapping in chickens. In this survey of 30 chicken processing plants the proportion of birds flapping their wings had usually subsided to less than 0.5 per cent after the birds had been conveyed 2 m away from the shackling area. Thereafter, there were many causes of wing flapping, of which the following were thought to be important; tight fitting shackles on the birds' shanks, electric shocks at the water bath stunner before stunning, sudden bright sunlight, bends in the line, temporary loss of visual contact between neighbouring birds, and unevenness in the line which jolted the birds. If it is decided that legislation is required to prescribe a minimum 'hang-on' period before stunning it is suggested that birds should not be put through the stunner less than 12 seconds after shackling because after this time 99.7 per cent of the birds had stopped flapping.
束缚会导致鸡扑打翅膀。在对30家鸡肉加工厂的这项调查中，在鸡被运离束缚区2米后，扑打翅膀的鸡的比例通常已降至不到0.5%。此后，有许多导致鸡扑打翅膀的原因，其中以下因素被认为很重要：鸡腿部的束缚装置过紧、电击昏前在水浴式电击器处受到电击、突然的强光、输送线弯曲、相邻鸡之间暂时失去视觉接触以及输送线不平整使鸡受到颠簸。如果决定需要立法规定电击昏前的最短“悬挂”时间，建议鸡在束缚后不少于12秒不应通过电击器，因为在此之后99.7%的鸡已停止扑打翅膀。
