Evaluation of a high-protein DDGS product in broiler chickens: performance,nitrogen-corrected apparent metabolisable energy,and standardised ileal amino acid digestibility

ABSTRACT

1. New production processes and additional uses for corn co-products have increased the availability of distiller’s dried grains with solubles (DDGS) with varying energy and amino acid digestibility, for use in poultry feed. The objective of this study was to determine the performance, N-corrected metabolisable energy (AME_n), and amino acid (AA) digestibility of a 34% CP (as fed) high-protein DDGS (HP-DDGS) included in poultry diets for Cobb 500 broiler chickens.

2. A total of 832 Cobb 500 broilers were randomly assigned to four dietary treatments containing 5% conventional DDGS (CV-DDGS) as a control or 10%, 15% and 20% HP-DDGS and fed for 42 d. After the performance trial, 240 birds from the original 832 were selected for a concurrent AME_n and AA digestibility experiment consisting of two AME_n diets and two AA diets.

3. Birds fed diets containing 15% and 20% HP DDGS gained less weight than birds fed the CV-DDGS (P < 0.05) but did not differ in feed intake (FI), and therefore had a less efficient FCR than the control (P < 0.05). The AME_n of HP-DDGS was determined to be 11.4 MJ/kg. The standardised ileal amino acid digestibility (SIAAD) of the essential amino acids Lys and Met were determined to be 80.9% and 88.6%, respectively.

4. HP-DDGS can be included in broiler diets up to 10% without any negative impact on performance or requiring supplemental Lys and Arg. The results from the AA digestibility study indicated that HP-DDGS could be a good source of digestible Lys.     

饲料中不同蛋白和钙对鸡肾脏影响的研究

通过饲喂不同蛋白,人工试验出鸡尿酸盐沉积模型,并观察鸡肾脏临床病理变化。采用高蛋白高钙饲料造模,将动物分健康对照组、高蛋白组、高钙组、高蛋白高钙组,通过鸡的死亡率、采食饮水量的变化、体重变化率、血液中尿酸盐含量等指标,考察肾肿模型,其中用磷钨酸显色法测定鸡血液中尿酸的含量。高蛋白高钙能使鸡增重率降低,鸡的饮水量、采食量降低,死亡率升高,血清中尿酸盐含量升高,尿酸盐在肾脏沉积形成花斑肾。用44%高蛋白高钙(0.5%钙)可以人工试验出鸡尿酸盐沉积模型。     

高蛋白专用稻特优K91高产栽培技术研究

通过对高蛋白专用稻特优K91秧龄、种植密度、施肥水平(以N为代表)3个栽培因子的研究,明确了特优K91在三明市低海拔地区作连晚栽培的较佳技术组合是:肥力中等田段30 d,30万丛/hm2,195 kg/hm2;肥力中上田段30～35 d,21～25.5万丛/hm2,135～195 kg/hm2.