Effect of Weather Conditions on the Fatty Acid Composition of Medium-Growth Chicken Reared in Organic Production System

ABSTRACT A total of 160 medium-sized one-day-old male chicks reared in organic conditions were studied individually from the first day of their life until slaughter (120 days). Two weather periods were considered, being period C colder than period H. A total of 24 chickens per period were randomly selected, then the breast muscle (m. Pectoralis major) was extracted for analysis. Individual fatty acids were measured by gas chromatography and expressed in grams per 100 g of fat. From the values obtained, total lipid fractions were calculated. Near infrared spectroscopy spectra (NIRS) were recorded on the surface of the breast without manipulating. Breast from chicken reared in H period had significantly lower (p

摘要 本研究对160只采用有机养殖方式饲养的1日龄雄性中型雏鸡进行个体跟踪研究，从出生首日直至屠宰（饲养周期共120天）。本研究设置两个气象周期，其中C周期环境温度低于H周期。每个周期随机选取24只肉鸡，采集其胸大肌（m. Pectoralis major）用于后续分析。采用气相色谱法检测各脂肪酸含量，结果以每100克脂肪中所含脂肪酸的克数表示。基于测得的实验数据，计算得到总脂质组分。在未经预处理的胸肌表面采集近红外光谱（Near Infrared Spectroscopy，简称NIRS）数据。H周期饲养的肉鸡胸肌相关指标显著更低（p