Zimmermann N G, Christensen K D, Wyatt C L, Twining P
Washington State University, Puyallup Research and Extension Center, Washington 98371-4998.
Poult Sci. 1994 Feb;73(2):326-30. doi: 10.3382/ps.0730326.
Continuous feeding of the anticoccidial halofuginone to broilers is associated with reduced skin tensile strength and increased skin tearing during processing. The possible mitigating effect of shuttle administration of halofuginone and salinomycin to female broilers was evaluated. Halofuginone or salinomycin were included in the starter and grower diets in all four possible combinations, with anticoccidial omitted from the finisher diets. Starter, grower, and finisher diets were fed to broilers through 3, 6, and 7 wk of age, respectively. Skin strength of pullets fed a diet based on milo and corn (NW) vs a diet based on corn was also compared in a factorial arrangement. Two further treatments were also included: 1) halofuginone-only NW diet supplemented with 2,500 ppm ascorbic acid from 0 to 7 wk; and 2) NW diet reared on wire floor without anticoccidial treatment. Skin tensile strength was determined at 3, 6, and 7 wk of age. Dietary composition had no effect upon skin strength or BW of broilers. Addition of ascorbic acid to the diet containing halofuginone anticoccidial did not improve skin strength. Continuous feeding of halofuginone reduced skin strength whereas withholding anticoccidial and continuous feeding of salinomycin resulted in high skin strength. When halofuginone was used in shuttle feeding programs with salinomycin, there were no differences in skin strength at 7 wk of age compared to birds that were continuously treated with salinomycin. These results suggest halofuginone may be used in a shuttle program either during the starter or grower phase without adverse affect on skin tensile strength at slaughter.
在肉鸡饲养过程中持续投喂抗球虫药常山酮会导致皮肤抗张强度降低，且在加工过程中皮肤撕裂增加。本研究评估了穿梭使用常山酮和盐霉素对雌性肉鸡可能产生的缓解作用。将常山酮或盐霉素以所有四种可能的组合添加到雏鸡和生长鸡日粮中，育肥期日粮不添加抗球虫药。雏鸡、生长鸡和育肥期日粮分别投喂至肉鸡3周龄、6周龄和7周龄。还通过析因设计比较了以高粱和玉米为基础日粮（NW）饲养的小母鸡与以玉米为基础日粮饲养的小母鸡的皮肤强度。另外还包括两种处理：1）从0至7周龄，仅在NW日粮中添加常山酮，并补充2500 ppm的抗坏血酸；2）在金属网上饲养的NW日粮，不进行抗球虫处理。在3周龄、6周龄和7周龄时测定皮肤抗张强度。日粮组成对肉鸡的皮肤强度或体重没有影响。在含常山酮抗球虫药的日粮中添加抗坏血酸并不能提高皮肤强度。持续投喂常山酮会降低皮肤强度，而不投喂抗球虫药并持续投喂盐霉素则会使皮肤强度较高。当常山酮与盐霉素用于穿梭投喂方案时，与持续使用盐霉素处理的鸡相比，7周龄时皮肤强度没有差异。这些结果表明，常山酮可在雏鸡或生长鸡阶段用于穿梭方案，而不会对屠宰时的皮肤抗张强度产生不利影响。
