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Effects of protein level and digestibility on the growth and carcass characteristics of broiler chickens

机译：蛋白质水平和消化率对肉鸡生长和car体特性的影响

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A study was conducted to evaluate the effects of dietary protein level and protein digestibility on the growth performance and carcass characteristics of broilers from 1 to 35 d of age. Broiler chickens (n = 320) were fed 4 different ideal protein-balanced, isocalori.c diets in a 2 x 2 factorial design with 2 levels of protein [high protein (Hi Pro; 20 and 18% or 200 and 180 g/kg) and low protein (LoPro; 18 and 16% or 180 and 160 g/kg) on d 1 to 14 and d 15 to 35, respectively] and 2 levels of protein digestibility [high digestibility (Hi Dig) and low digestibility (LoDig); approximately 85% and 80% CP digestibility, respectively]. The HiDig diets were formulated using soybean meal and fishmeal, whereas the LoDig diets used wheat distillers dried grains with solubles and meat and bone meal as the primary protein. sources. The standardized ileal digestibility (SID) values of the wheat distillers dried grains with solubles and meat and bone meal (56.5 and 72.0% SID for lysine, respectively) were measured before the experiment to improve the accuracy of the diet formulations. During the starter phase, the interaction was significant for ADG; birds fed the LoPro-LoDig diet grew slower than birds fed the other 3 diets (P < 0.05). During the grower phase, the interaction was significant for ADFI; birds fed the LoPro-LoDig diet had the lowest ADFI compared with those fed the other 3 diets. The interaction between protein level and digestibility was significant for the SID of most of the AA and was significantly higher for birds fed the HiPro-HiDig diet compared with those fed the other 3 diets. Total breast meat yield was significantly higher in birds fed the Hi Pro diets than in those fed the LoPro diets, whereas birds fed the Hi Dig diets had significantly more abdominal fat than those fed the LoDig diets. The results suggest that low-protein diets can support growth performance equal to high-protein diets when highly digestible ingredients are used. However, maximum breast meat yield requires a high-protein diet and is not affected by ingredient digestibility.
机译：进行了一项研究，以评估日粮蛋白质水平和蛋白质消化率对1至35 d龄肉鸡生长性能和car体特性的影响。肉鸡（n = 320）以2 x 2因子设计饲喂4种不同的理想蛋白质平衡，等热量的日粮，其中2种蛋白质水平较高（高蛋白（高蛋白; 20％和18％或200和180 g / kg ）和低蛋白（LoPro;分别在d 1到14和d 15到35分别为18和16％或180和160 g / kg）和2种水平的蛋白消化率[高消化率（Hi Dig）和低消化率（LoDig ）; CP消化率分别约为85％和80％]。 HiDig日粮是用大豆粉和鱼粉配制的，而LoDig日粮是用小麦蒸馏器干燥的谷物制成的，其中以可溶物和肉和骨粉为主要蛋白质。资料来源。在实验前测量了小麦蒸馏器干粮和可溶物以及肉和骨粉的标准化回肠消化率（SID）值（赖氨酸分别为56.5和72.0％SID），以提高日粮配方的准确性。在启动阶段，交互作用对ADG十分重要。饲喂LoPro-LoDig饲料的家禽比饲喂其他3种饲料的家禽生长慢（P <0.05）。在生长阶段，这种相互作用对ADFI很重要。与喂食其他3种饮食的鸟类相比，喂食LoPro-LoDig饮食的鸟类的ADFI最低。蛋白质水平和消化率之间的相互作用对于大多数AA的SID均显着，与喂饲HiPro-HiDig日粮的禽相比，饲喂其他3种日粮的禽显着更高。喂Hi Pro日粮的鸡的总胸脯肉产量明显高于喂LoPro日粮的鸡，而喂Hi Dig日粮的鸟的腹部脂肪明显多于喂LoDig日粮的鸟。结果表明，当使用高度易消化的成分时，低蛋白饮食可以支持与高蛋白饮食相同的生长性能。但是，最大的胸肉产量需要高蛋白饮食，并且不受成分消化率的影响。

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