Hellwing Anne Louise F, Tauson Anne-Helene, Skrede Anders
Department of Animal and Veterinary Basic Sciences, The Royal Veterinary and Agricultural University, Frederiksberg C, Denmark.
Arch Anim Nutr. 2006 Oct;60(5):365-81. doi: 10.1080/17450390600884351.
This experiment investigates the effect of increasing the dietary content of bacterial protein meal (BPM) on the protein and energy metabolism, and carcass chemical composition of growing chickens. Seventy-two Ross male chickens were allocated to four diets, each in three replicates with 0% (D0), 2% (D2), 4% (D4), and 6% BPM (D6), BPM providing up to 20% of total dietary N. Five balance experiments were conducted when the chickens were 3-7, 10-14, 17-21, 23-27, and 30-34 days old. During the same periods, 22-h respiration experiments (indirect calorimetry) were performed with groups of 6 chickens (period 1), 5 chickens (period 2), and one chicken (periods 3-5). After each balance period, one chicken in each cage was killed and the carcass weight was recorded. Chemical analyses were performed on the carcasses from periods 1, 3, and 5. Weight gain, feed intake, and feed conversion rate were found to be similar for all diets. Chickens on D0 retained 1.59 g N x kg(-0.75) x d(-1), significantly more than chickens on D2, D4, and D6, which retained 1.44 g, 1.52 g, and 1.50 g N x kg(-0.75) x d(-1), respectively. This was probably caused by the higher nitrogen content of DO. Neither the HE (p = 0.92) nor the retention of energy (p = 0.88) were affected by diet. Carcass composition was similar between diets, in line with the values for protein and energy retention found in the balance and respiration experiments. It was concluded that the overall protein and energy metabolism as well as carcass composition were not influenced by a dietary content of up to 6% BPM corresponding to 20% of dietary N.
本实验研究增加细菌蛋白粉（BPM）日粮含量对生长鸡蛋白质和能量代谢以及胴体化学成分的影响。72只罗斯雄性鸡被分配到四种日粮组，每组三个重复，日粮中BPM含量分别为0%（D0）、2%（D2）、4%（D4）和6%（D6），BPM提供的氮占日粮总氮的20%。在鸡3 - 7日龄、10 - 14日龄、17 - 21日龄、23 - 27日龄和30 - 34日龄时进行了五次平衡实验。在同一时期，对6只鸡一组（第1阶段）、5只鸡一组（第2阶段）和1只鸡（第3 - 5阶段）进行了22小时呼吸实验（间接测热法）。每个平衡期结束后，处死每个笼子里的一只鸡并记录胴体重。对第1、3和5阶段的胴体进行了化学分析。发现所有日粮组的体重增加、采食量和饲料转化率相似。D0组的鸡氮保留量为1.59 g N·kg⁻⁰.⁷⁵·d⁻¹，显著高于D2、D4和D6组，后三组的氮保留量分别为1.44 g、1.52 g和1.50 g N·kg⁻⁰.⁷⁵·d⁻¹。这可能是由于D0的氮含量较高。日粮对热增耗（p = 0.92）和能量保留（p = 0.88）均无影响。日粮之间的胴体组成相似，与平衡和呼吸实验中发现的蛋白质和能量保留值一致。得出的结论是，日粮中BPM含量高达6%（相当于日粮氮的20%）对总体蛋白质和能量代谢以及胴体组成没有影响。
