从 7 到 21 日龄蓝胸鹌鹑（Excalfactoria chinensis）维持与生长所需蛋白质的分配。

Apportioning protein requirements for maintenance v. growth for blue-breasted quail (Excalfactoria chinensis) from 7 to 21 days of age.

机构信息

Department of Animal Science and Technology, National Taiwan University, No. 50, Lane 155, Section 3, Keelung Road, Taipei 106, Taiwan.

出版信息

Animal. 2011 Aug;5(10):1515-20. doi: 10.1017/S1751731111000590.

DOI:10.1017/S1751731111000590

PMID:22440341

Abstract

The aim of this study was to investigate protein requirements for the maintenance and growth of blue-breasted quail (Excalfactoria chinensis) from 7 to 21 days of age. A total of 180 quails, 7 days old, were randomly assigned to 36 cages and for 2 weeks were fed diets with a metabolisable energy concentration of 12.13 MJ/kg and a dietary CP concentration of 125, 150, 175, 200, 225 or 250 g/kg. The average BW per cage and the feed intake per cage were recorded daily. The results showed that quails fed 125 g/kg CP could not maintain their BW and had negative feed efficiency. There were linear and quadratic relationships between CP level and response criteria, including BW, weight gain, feed intake, feed efficiency, final body nitrogen mass and body nitrogen accretion (P<0.05). The dietary CP requirements, as calculated using a one-slope quadratic broken-line model, were 211 and 202 g/kg according to weight gain and feed efficiency, respectively. The regression equations, on the basis of metabolic BW, of daily weight gain on daily protein intake according to the model were Y=0.137-2.128(0.113-X) if X<0.113 and Y=0.137 if X>or=0.113 (R2=0.96, P<0.001), which meant that the protein requirement for maintenance was 0.049 times the metabolic BW and that to gain 1 g weight quails needed to ingest an extra 0.47 g protein after the maintenance requirement was satisfied. The regression equations, on the basis of metabolic BW, of daily body nitrogen accretion on daily protein intake according to the model were Y=5.667-76.700(0.119-X) if X<0.119 and Y=5.667 if X>or=0.119 (R2=0.95, P<0.001), which meant that quails had to receive an amount of protein equal to their metabolic BW multiplied by 0.045 to satisfy the requirement for maintenance and then ingest an extra 13 g protein to accrete 1 g body nitrogen. In conclusion, growth or protein accretion rates should be regulated according to dietary CP for specific experimental purposes via apportioning protein requirements for maintenance v. growth.

摘要

本研究旨在探讨 7 至 21 日龄蓝胸鹌鹑（Excalfactoria chinensis）的维持和生长所需的蛋白质水平。将 180 只 7 日龄鹌鹑随机分配到 36 个笼中，2 周内饲喂代谢能浓度为 12.13MJ/kg、粗蛋白（CP）浓度为 125、150、175、200、225 或 250g/kg 的日粮。每天记录每个笼的平均体重和采食量。结果表明，饲喂 125g/kg CP 的鹌鹑无法维持体重，且饲料效率为负。CP 水平与 BW、增重、采食量、饲料效率、终体氮质量和体氮沉积等响应指标之间存在线性和二次关系（P<0.05）。根据增重和饲料效率，采用单斜率二次折线模型计算得出，CP 的需要量分别为 211 和 202g/kg。基于代谢 BW，根据模型计算出每日蛋白摄入量与每日体重增加之间的回归方程为：当 X<0.113 时，Y=0.137-2.128（0.113-X）；当 X≥0.113 时，Y=0.137（R2=0.96，P<0.001），这意味着维持需要的蛋白质是代谢 BW 的 0.049 倍，满足维持需要后，鹌鹑每增重 1g 需额外摄入 0.47g 蛋白质。基于代谢 BW，根据模型计算出每日体氮沉积与每日蛋白摄入量之间的回归方程为：当 X<0.119 时，Y=5.667-76.700（0.119-X）；当 X≥0.119 时，Y=5.667（R2=0.95，P<0.001），这意味着鹌鹑需要摄入等于其代谢 BW 乘以 0.045 的蛋白质来满足维持需要，然后再额外摄入 13g 蛋白质来沉积 1g 体氮。综上所述，应该根据特定实验目的通过分配维持与生长所需的蛋白质来调节生长或蛋白质沉积速率，从而调节日粮 CP 水平。