Stocking density effects on male broilers grown to 1.8 kilograms of body weight
Stocking density effects on male broilers grown to 1.8 kilograms of body weight
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DOI：
10.1093/ps/85.2.344
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发表时间：
2006-02-01
期刊：
影响因子：
4.4
通讯作者：
Roush, WB
中科院分区：
文献类型：
--
作者：
Dozier, WA;Thaxton, JP;Roush, WB
本研究旨在探讨饲养密度对生长至1.8公斤公肉鸡的生活性能、生理应激水平指标和加工产量的影响。将总共3，120只Ross x Ross 708雄性雏鸡放入32个地板围栏（5.57 m2/围栏）。饲养密度处理分别为25、（75只鸟/围栏）、30（90只鸟/围栏）、35（105只鸟/围栏）和40（120只鸟/围栏）kg BW/m2。随着放养密度的增加，35 d时的日增重、耗料量和饲料转化率均受到不利影响。生理应激指标（血浆皮质酮，葡萄糖，胆固醇，总亚硝酸盐，和嗜异性：淋巴细胞）没有受到影响。凋落物水分较高，放养密度增加，导致更高的脚垫病变评分。在平行的增长反应，胴体重被压低，增加放养密度，但胴体产量，绝对和相对量的腹部脂肪，胴体皮肤缺陷不受影响。增加放养密度降低了胸肉重、胸肉相对产量和嫩胸重，但对嫩胸产量无影响。当计算的放养密度增加5 kg BW/m2超过25 kg BW/m2时，最终BW和胸肉重量分别减少41和12 g。我们的结论是，增加放养密度超过30公斤BW/m2的生长反应和肉产量的肉鸡生长到1.8公斤，但不改变生理应激指标产生不利影响。
This study examined the effects of stocking density on live performance, physiological stress level indicators, and processing yields of male broilers grown to 1.8 kg. A total of 3,120 Ross x Ross 708 male chicks was placed into 32 floor pens (5.57 m(2)/pen). Stocking density treatments were 25, (75 birds/pen), 30 (90 birds/pen), 35 (105 birds/pen), and 40 (120 birds/pen) kg of BW/m(2). The BW gain, feed consumption, and feed conversion were adversely affected with increasing stocking densities by 35 d. Physiological stress indicators (plasma corticosterone, glucose, cholesterol, total nitrites, and heterophil:lymphocyte) were not affected. Litter moisture was higher as stocking density increased, which led to higher footpad lesion scores. In parallel to growth responses, carcass weight was depressed by increasing stocking density, but carcass yield, absolute and relative amounts of abdominal fat, and carcass skin defects were not affected. Increasing stocking density decreased breast fillet weight and its relative yield and breast tender weight, but not breast tender yield. As calculated stocking density increased 5 kg of BW/m(2) beyond 25 kg of BW/m(2), final BW and breast fillet weight decreased by 41 and 12 g, respectively. We conclude that increasing stocking density beyond 30 kg of BW/m(2) adversely affects growth responses and meat yield of broilers grown to 1.8 kg but does not alter physiological stress indicators.