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首页> 美国卫生研究院文献>Animal Nutrition >Balanced nutrient density for broiler chickens using a range of digestible lysine-to-metabolizable energy ratios and nutrient density: Growth performance nutrient utilisation and apparent metabolizable energy
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Balanced nutrient density for broiler chickens using a range of digestible lysine-to-metabolizable energy ratios and nutrient density: Growth performance nutrient utilisation and apparent metabolizable energy

机译：使用一系列可消化的赖氨酸到代谢能量比和营养密度的肉鸡鸡的平衡营养密度：生长性能营养利用和表观代谢能量

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Currently, specific nutrient concentration, metabolizable energy (ME) and digestible amino acids are used as feed formulation criteria. A balanced nutrient density (BND) concept based on 2 criteria of nutrient density and balanced amino acids-to-ME ratio may offer more flexibility in optimisation of profit in formulation of diets compared with current formulation based on set values per unit of feed mass. A total of 672 one-d-old off-sex male Ross 308 broiler chickens were used across two 42-d performance trials in a 3 × 2 factorial arrangement of treatments with each diet replicated 8 times (14 birds per replicate). The experimental factors were 2 nutrient density levels (low [LD] and high [HD]) and 3 digestible lysine-to-ME ratios (DLYS:ME; low, medium, and high). Low density diets had ME of 2,876 and 3,023 kcal/kg for starter and finisher, respectively, while values for HD diets were 3,169 and 3,315 kcal/kg with proportionally higher non-nitrogenated nutrients. Separate digestibility and apparent metabolizable energy (AME) assays were conducted at d 21 and 42. Digestibility assays at d 7 were conducted on birds used for performance trials. Regardless of the diet density, birds fed low DLYS:ME had a lower (P < 0.01) feed intake (d 0 to 42) than medium and high DLYS:ME. Without interaction, birds fed low and medium DLYS:ME had a similar body weight gain being the heaviest while birds low DLYS:ME were the lightest. By an interaction (P < 0.05), the highest overall FCR value was observed for birds fed LD × low DLYS:ME and improved linearly when DLYS:ME increased to the highest level reaching a limit for birds fed HD × medium DLYS:ME. Calorie conversion linearly decreased (P < 0.001) with increments in DLYS:ME. Jejunal and ileal starch and protein digestibility were affected on d 21 and 42 but not on d 7 of age. Given the independence of response on BW and feed consumption, the use of BND as a flexible system in diet formulations has the potential to enable more accurate formulation for optimisation of growth performance of broiler chickens.
机译：目前，使用特定的营养素浓度，可易易化能量（ME）和可消化氨基酸作为饲料制剂标准。平衡营养密度（BND）概念基于2营养密度和平衡氨基酸对ME比的标准，可以提供更大的灵活性，以优化饮食的配方利润，而基于每单位饲料质量的设定值。共有672个单D-Ond-Sex雄性罗斯308肉鸡鸡在3×2因子的治疗中的两个42-d绩效试验中使用了每次饮食的治疗，每次复制8次（每次重复14只鸟）。实验因素是2种营养密度水平（低[LD]和高[HD]）和3种可消化赖氨酸对我的比例（Dlys：Me; Low，Medium和High）。低密度饮食分别具有2,876和3,023 kcal / kg的起始和整理剂，而HD饮食的值为3,169和3,315千卡/千克，具有比例更高的非氮营养物。在D 21和42下进行单独的消化率和表观代谢能量（AME）测定。在用于性能试验的鸟类上进行D 7的消化率测定。无论饮食密度如何，喂食低Dlys：me较低（p <0.01）进料摄入（d 0至42），比中等和高分为：me。没有互动，鸟类喂水低和中等Dlys：我的体重增加是最重的，而鸟类低Dlys：我是最轻的。通过相互作用（P <0.05），对于喂养LD×低DLYS的鸟类，观察到最高总体FCR值：当DLYS时，我的线性地改善：我增加到喂养HD×中间DLYS的鸟类的最高水平达到极限：ME。卡路里转换线性减少（P <0.001），增量在DLYS中：ME。 Jejunal和Ileal淀粉和蛋白质消化率受到D 21和42的影响，但不在D岁的D 24中受到影响。鉴于对BW和饲料消耗的响应的独立性，使用BND作为饮食制剂中的柔性系统具有可能更准确的配方以优化肉鸡鸡的生长性能。

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