Effects of Dietary Nutrient Density on Performance and Carcass Quality of Broilers 42 to 49 Days of Age
Effects of Dietary Nutrient Density on Performance and Carcass Quality of Broilers 42 to 49 Days of Age
复制标题
日粮营养密度对 42 至 49 日龄肉鸡生产性能和胴体品质的影响
DOI：
10.1093/japr/1.4.367
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
P. Waldroup
中科院分区：
文献类型：
--
作者：
J. Skinner;A. Waldroup;P. Waldroup
摘要在加工前一周（42 ~ 49日龄），肉鸡消耗的饲料约占总饲料的25%。本试验通过四个试验研究了不同营养水平对商品代肉鸡生产性能和胴体品质的影响。试验期为42日龄，饲粮为3200 ME kcal/kg的全营养日粮。从42日龄到49日龄，它们被喂食颗粒状饲料，该饲料以55 ME kcal/kg的增量配制成含有3080至3465 ME kcal/kg。所有必需营养素都按能量比例保持。测定增重（WG）和饲料消耗（FC）。对禽类样品进行处理，以确定胴体产量和腹部脂肪含量。雄性和雌性肉鸡对营养密度的饮食差异的反应相似。回归分析表明，随着营养密度的增加，WG显着下降。随着营养密度的增加，FC显著降低，同时每单位增重所需饲料减少。热量摄入量之间的治疗是相似的，但热量效率（千卡ME/千克增重）显着降低营养密度的增加。屠宰率和腹脂含量随营养密度的增加而显著降低。这些数据表明，在这项研究中检查的日粮密度水平影响采食量和热量利用。必须考虑调整膳食营养密度水平的经济性。
Abstract Approximately 25% of the total feed consumed by broilers is eaten in the week prior to processing (from 42 to 49 days of age). Four experiments were conducted to determine the effects of varying dietary nutrient density on performance and carcass characteristics of commercial strain broilers during this period. Broilers were fed nutritionally complete diets with 3200 ME kcal/kg until 42 days of age. From 42 to 49 days of age, they were fed pelleted diets formulated to contain 3080 to 3465 ME kcal/kg in increments of 55 ME kcal/kg. All essential nutrients were maintained in proportion to energy. Body weight gain (WG) and feed consumption (FC) were determined. Samples of birds were processed to determine carcass yield and abdominal fat content. Male and female broilers responded similarly to dietary differences in nutrient density. Regression analysis indicated a significant decrease in WG as nutrient density increased. There was a significant reduction in FC as nutrient density increased, with a concomitant reduction in feed required per unit of gain. Calorie intake was similar among treatments, but caloric efficiency (kcal ME/kg gain) was depressed significantly as nutrient density increased. Dressing percentage and abdominal fat content decreased significantly as nutrient density increased. These data indicate that the dietary density levels examined in this study influence feed intake and calorie utilization. The economics of modifying dietary nutrient density levels must be considered.