本文研究3种不同饲养方式对肉鸡生产性能、肉质性状及肌肉组织学特性的影响。试验选择体重相近［（367.66±1.12） g］、健康的21日龄爱拔益加（AA）肉公鸡480只，随机分为3个试验处理：网上平养、室内地面平养及半舍饲（即连接有户外运动场的室内地面平养），后两者以稻草作为垫料。每个处理设4栏，每栏为1个重复，每个重复40只鸡。试验至49日龄结束。结果表明：1）肉鸡平均日采食量在各处理间没有显著差异（P>0.05），但半舍饲肉鸡死亡率和料重比增加（P<0.05），平均日增重显著低于网上平养肉鸡（P<0.05）；2）半舍饲肉鸡腹脂率显著低于其他2个处理的肉鸡（P<0.05），胸肌剪切力显著高于其他2个处理的肉鸡（P<0.05），胸肌肌纤维直径在3种饲养方式的肉鸡中最大，其次为室内地面平养肉鸡、网上平养肉鸡（P<0.05），肌纤维密度则与此相反（P<0.01）；3种饲养方式对肉鸡胸肌pH、滴水损失、肌内脂肪及肌苷酸含量没有显著影响（P>0.05）。从以上结果可知，在3种饲养方式中，半舍饲肉鸡生产性能较低，同时腹脂率减少，胸肌肌纤维较粗，肉质较坚韧。

The effects of three housing systems on performance, meat quality and muscular histological characteristics of broilers were investigated. Four hundred and eighty 21-day-old healthy male Arbor Acres (AA) broilers with the similar weight of (367.66±1.12) g were randomly assigned to one of the three housing systems: net-rearing and floor-rearing with or without outdoor access. Straws were used as the bedding of broilers in floor-rearing with or without outdoor access. Four pens were placed in a rearing pattern containing forty birds each, and a pen was a replicate. The experiment ended at 49 days of age. The results showed as follows: 1) there were no significant differences in the average daily feed intake of the broilers among three treatments (P>0.05), while the broilers in floor-rearing with outdoor access showed higher mortality and feed to gain ratio (P<0.05), and the average daily weight gain was lower than that in net-rearing (P<0.05); 2) the abdominal fat proportion of the broilers in floor-rearing with outdoor access was significantly lower than that in the other two groups (P<0.05), the shear force was significantly higher than that in the other two groups (P<0.05), and breast muscle fiber diameter was the largest in the three treatments, followed by that of broilers in floor-rearing without outdoor access, and then in net-rearing (P<0.05), but as to the muscle fiber density it was in reverse order; there were no significant differences in pH, drop lose, intramuscular fat (IMF) and insine monphosphate (IMP) of breast muscle among the three housing systems (P>0.05). The results suggest that among the three housing systems, the broilers in floor-rearing with outdoor access show lower performance, lower abdominal fat proportion, thicker breast muscle fiber and harder meat.［Chinese Journal of Animal Nutrition, 2010，22（5）:1237-1242］