Thaxton J P, Dozier W A, Branton S L, Morgan G W, Miles D W, Roush W B, Lott B D, Vizzier-Thaxton Y
Department of Poultry Science, Mississippi State University, Mississippi State 39762, USA.
Poult Sci. 2006 May;85(5):819-24. doi: 10.1093/ps/85.5.819.
Three trials were conducted to assess the effects of stocking density on physiological adaptive responses of broilers. Male broilers were reared in floor pens under conditions similar to those used commercially in the United States. Accepted indicators of adaptation to a stressor were measured on d 49 including plasma concentrations of corticosterone, glucose, cholesterol, and total nitrites as an indicator of nitric oxide, as well as heterophil:lymphocyte ratio. In trial 1, calculated stocking densities were 20, 25, 30, 35, 40, 45, 50, and 55 kg of BW/ m2 and in trials 2 and 3, stocking densities were 30, 35, 40, and 45 kg of BW/m2. Stocking densities were calculated based on a final BW of 3.3 kg. Linear trend analyses were used to assess the role of stocking density on each of the physiological parameters. Results indicate that stocking density did not cause physiological adaptive changes indicative of stress.
进行了三项试验，以评估饲养密度对肉鸡生理适应性反应的影响。雄性肉鸡在美国商业养殖条件相似的地面围栏中饲养。在第49天测量了适应应激源的公认指标，包括血浆皮质酮、葡萄糖、胆固醇浓度以及作为一氧化氮指标的总亚硝酸盐，还有嗜异性粒细胞：淋巴细胞比例。在试验1中，计算得出的饲养密度为20、25、30、35、40、45、50和55 kg体重/m²，试验2和3中的饲养密度为30、35、40和45 kg体重/m²。饲养密度根据最终体重3.3 kg计算得出。采用线性趋势分析来评估饲养密度对每个生理参数的作用。结果表明，饲养密度并未引起表明应激的生理适应性变化。
