McGovern R H, Feddes J J, Robinson F E, Hanson J A
Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Canada.
Poult Sci. 1999 Apr;78(4):522-8. doi: 10.1093/ps/78.4.522.
The effect of feed restriction and the application of canola oil to broiler straw litter to contain respirable dust on growth performance, carcass traits, and the incidence of ascites was evaluated with 800 male broilers studied in two 6-wk periods. Two pens of birds were feed restricted. Two pens of birds received feed ad libitum for the 6-wk trial. One restricted and one ad libitum pen received biweekly addition of canola oil to the litter. At 6 wk of age, 30 birds from each pen were killed for determination of breast muscle, fat pad, and heart weights. All birds were scored for the incidence of ascites at processing. A cross sectional image of each heart was digitally recorded and, using image analysis, the right ventricular area (RVA), left ventricular area (LVA), and total heart area (HA) were determined. The right ventricular wall was removed and its weight was expressed as a percentage of total heart weight (PRVW). The 40-d BW was significantly greater in the ad libitum birds (2.07 kg) than in the feed-restricted birds (1.86 kg). The right ventricular weight (RVW) (1.69 and 1.92 g) and the RVA (0.35 and 0.40 cm2) were also significantly different between the two feeding treatments. The ascites score was significantly correlated to the RVW (r = 0.50) and RVA (r = 0.52). The RVA was also correlated to the RVW (r = 0.63). Oiling the litter did not result in differences in carcass characteristics. Litter oiling significantly reduced the RVA of the ad libitum birds (0.36 cm2) compared to the ad libitum birds that did not have oiled litter (0.44 cm2). Feed restriction reduced the incidence of ascites, but also reduced gain. Litter oiling in the feed-restricted groups reduced the RVA, but did not reduce mortality.
用800只雄性肉鸡在两个6周龄阶段进行研究，评估了限饲以及在肉鸡垫料中添加菜籽油以抑制可吸入粉尘对生长性能、胴体性状和腹水发病率的影响。两组鸡进行限饲。两组鸡在为期6周的试验中自由采食。一组限饲和一组自由采食的鸡舍垫料每两周添加一次菜籽油。在6周龄时，从每个鸡舍选取30只鸡宰杀，测定胸肌、脂肪垫和心脏重量。在屠宰时对所有鸡的腹水发病率进行评分。对每个心脏的横截面图像进行数字记录，并通过图像分析确定右心室面积（RVA）、左心室面积（LVA）和全心面积（HA）。切除右心室壁，其重量以占全心重量的百分比表示（PRVW）。自由采食组鸡40日龄体重（2.07千克）显著高于限饲组鸡（1.86千克）。两种饲养方式下右心室重量（RVW）（分别为1.69克和1.92克）和RVA（分别为0.35平方厘米和0.40平方厘米）也存在显著差异。腹水评分与RVW（r = 0.
