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首页> 美国卫生研究院文献>Poultry Science >Effects of reducing dietary amino acid density and stocking density on growth performance carcass characteristics meat quality and occurrence of white striping in broiler chickens
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Effects of reducing dietary amino acid density and stocking density on growth performance carcass characteristics meat quality and occurrence of white striping in broiler chickens

机译：减少膳食氨基酸密度对肉鸡生长性能胴体特征肉质肉鸡肉质的影响的影响

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A 49-day trial was conducted to determine the impact of dietary amino acid (AA) density and stocking density (SD) on growth performance, carcass traits, meat quality, and white striping (WS) occurrence in broiler chickens. Two hundred eighty-eight Ross 308 male broilers consisting of 6 replicate cages with 8 broilers per replicate were used. Treatments were arranged in a 3 × 2 factorial and consisted of 3 AA densities (normal, 10, or 20% lower than normal) and 2 different SD (high 35 kg/m2 or low 26 kg/m2). Breasts were classified as normal, moderate, and severe for WS. Data were analyzed as a completely randomized design using the GLM procedure. Decreasing AA density decreased overall growth performance, carcass, breast yields, and fillet dimensions linearly, while leg and rib cage yields increased linearly (P < 0.01). High SD decreased hot carcass, breast, wings, and rib cage weights in birds fed normal AA diets (P < 0.05). High SD increased the length of breast fillet (P < 0.05). Cooking loss, breast lightness (L∗), and redness (a∗) at 48 h postmortem increased linearly with decreasing AA density, while ultimate breast pH (pHu) and nitrogen content decreased linearly (P < 0.05). The occurrence of normal, moderate, and severe WS fillets was 45.3, 49.1, and 5.6%, respectively. As the dietary AA density decreased, the occurrence of no WS breast fillets increased linearly, whereas the occurrence of moderate WS fillets and mean WS score decreased linearly (P < 0.05). SD did not affect the occurrence of WS. Severe WS fillets were heavier and had higher cranial thickness, pHu, and fat content and lower yellowness (P < 0.05), but water-holding capacity, nitrogen content, L∗, and a∗ value did not differ among different WS scores. Taken together, WS occurrence and severity increased with higher growth rate. Growth depression created by lowering dietary AA density regardless of SD resulted in a decrease in mean WS score, but it also compromised the growth and meat quality.
机译：进行了49天的试验以确定膳食氨基酸（AA）密度和放养密度对肉鸡生长性能，胴体性状，肉质和白色条纹（WS）发生的影响。使用由6个复制套件组成的两百八十八个罗斯308雄性肉鸡，每次复制8个肉鸡。处理以3×2因子排列，并由3 AA密度（正常，10，或20％低于正常）和2种不同的Sd（高35kg / m 2或低26kg / m 2）。乳房被归类为正常，中等，严重的WS。使用GLM程序分析数据作为完全随机的设计。降低AA密度对整体生长性能，胎体，乳房产量和圆角尺寸线性降低，而腿部和肋架产量线性增加（P <0.01）。 HIGH SD在喂食正常AA饮食中的鸟类中的热胴体，乳房，翅膀和肋骨系数（P <0.05）。高SD增加了乳腺圆角的长度（P <0.05）。在48小时后烹饪损失，乳房亮度（L *）和发红（a *）随着均线的降低线性而导致线性增加，而最终的乳液pH（PHU）和氮含量线性降低（P <0.05）。正常，中等和严重的Ws圆角的发生分别为45.3,49.1和5.6％。随着膳食AA密度降低，乳房圆角的发生线性增加，而中度Ws圆角的发生和平均值线性降低（P <0.05）。 SD没有影响WS的发生。严重的WS圆角较重，颅厚度，PHU和脂肪含量和较低的黄色含量（P <0.05），但水控能力，氮含量，L *和*值不同的不同WS分数没有差异。随着增长率更高，WS发生和严重程度增加。通过降低膳食AA密度而产生的生长抑郁无论SD如何导致平均值的分数减少，但它也损害了生长和肉质。

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