Abstract The aim of the present study was to determine the effects of supplementing drinking water with an extract of mixed herbs or housing with outdoor access on carcass traits, levels of antioxidant enzymes (SOD, CAT, GPx), reduced glutathione (GSH), malondialdehyde (MDA), and selected quality parameters of meat from broiler chickens. One-day-old Ross 308 broiler chickens were allocated to three groups: group I (control), in which birds were kept in compartments on litter and had no outdoor access; group II, in which birds were kept in compartments on litter without outdoor access and were supplemented with an extract of mixed herbs (50% Melissa officinalis L. and 50% Urtica dioica L.) at 2 ml/l of drinking water; and group III, in which birds were raised in compartments on litter and had outdoor access from day 1 of rearing. Throughout the rearing period, the broilers had free access to feed and water. On day 42, 20 birds were selected from each group, slaughtered and subjected to simplified slaughter analysis. Their breast and leg muscles were measured for pH, colour, water holding capacity (WHC) and drip loss, and analysed for the content of antioxidant enzymes (SOD, CAT, GPx), reduced glutathione (GSH), malondialdehyde (MDA) and fatty acids. The outdoor access reduced dressing percentage, both with (P≤0.01) and without giblets (P≤0.05). The supplementation of drinking water with the mixed herb extract (2 ml/l) improved the muscle antioxidant status (higher SOD, CAT and GSH content) and reduced lipid peroxidation in the leg muscles of the broilers (lower MDA level). In general, the supplementation of the diet with the mixture of herbs in the applied form and concentration, as well as the outdoor access had no effect on the other examined quality parameters of broiler meat.

中文翻译：

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饮用水补充混合药草提取物或户外饮水对肉鸡肉质特性的影响

摘要 本研究的目的是确定在饮用水中添加混合草药提取物或户外活动房屋对胴体性状、抗氧化酶（SOD、CAT、GPx）、还原型谷胱甘肽 (GSH)、丙二醛水平的影响。 (MDA)，以及来自肉鸡的肉的选定质量参数。一天大的Ross 308 肉鸡被分配到三组：第一组（对照组），其中鸡被关在隔间里，不能进入室外；第 II 组，其中鸟类被关在垫料隔间内，无法进入室外，并补充了混合草药提取物（50% Melissa officinalis L. 和 50% Urtica dioica L.），饮用水为 2 ml/l；和第三组，其中鸟类在垫料的隔间中饲养，并且从饲养的第 1 天起就可以进入室外。在整个饲养期间，肉鸡可以自由获得饲料和水。在第 42 天，从每组中选出 20 只鸡进行屠宰并进行简化屠宰分析。他们测量了胸部和腿部肌肉的 pH 值、颜色、持水能力 (WHC) 和滴水损失，并分析了抗氧化酶 (SOD、CAT、GPx)、还原型谷胱甘肽 (GSH)、丙二醛 (MDA) 和脂肪的含量。酸。有（P≤0.01）和没有内脏（P≤0.05）的户外通道都降低了穿衣率。在饮用水中添加混合草药提取物 (2 ml/l) 改善了肌肉抗氧化状态（较高的 SOD、CAT 和 GSH 含量）并减少了肉鸡腿部肌肉的脂质过氧化（较低的 MDA 水平）。一般来说，