Kestin S C, Gordon S, Su G, Sørensen P
Department of Clinical Veterinary Science, University of Bristol, Langford.
Vet Rec. 2001 Feb 17;148(7):195-7. doi: 10.1136/vr.148.7.195.
Thirteen genotypes of poultry were selected to represent a wide range of growth profiles and were fed either a non-limiting or Label Rouge diet. The birds' degree of lameness and liveweight were measured after 54 and 81 days. The birds reared on the Label Rouge diets were less lame than birds of the same genotype reared on the non-limiting diet. More traditional and slower growing genotypes tended to be less lame than the modern genotypes reared on the same feeding regimen. All the birds, irrespective of their genotype or diet, were less lame after 54 days than after 81 days. However, when liveweight was included in the analysis as a covariable, many of the differences disappeared. Only age at assessment significantly affected the walking ability of the birds, with the birds being approximately 0.6 units of gait score worse at 54 days of age than at 81 days. The regression coefficient between gait score and liveweight was 1.262 at 54 days and 1.128 at 84 days. The results indicated that liveweight was an important determinant of lameness in the diverse range of genotypes examined, that growth rate was also an important determinant of lameness and that younger birds may be more sensitive to differences in liveweight than older birds.
选择了13种家禽基因型来代表广泛的生长曲线，并分别饲喂非限量日粮或红标签日粮。在54天和81天后测量家禽的跛行程度和体重。饲喂红标签日粮的家禽比饲喂非限量日粮的同基因型家禽跛行程度轻。在相同饲养方案下，更传统、生长较慢的基因型往往比现代基因型的跛行程度轻。所有家禽，无论其基因型或日粮如何，在54天后的跛行程度都比81天后轻。然而，当将体重作为协变量纳入分析时，许多差异消失了。只有评估时的年龄显著影响家禽的行走能力，54日龄的家禽步态评分比81日龄的家禽大约差0.6个单位。54天时步态评分与体重的回归系数为1.262，84天时为1.128。结果表明，体重是所研究的不同基因型家禽跛行的一个重要决定因素，生长速度也是跛行的一个重要决定因素，并且幼禽可能比成年禽对体重差异更敏感。
