Bernacki Zenon, Bawej Małgorzata, Kokoszyński Dariusz
Department of Poultry Breeding, University of Technology and Life Sciences, Mazowiecka 28, 85-084 Bydgoszcz, Poland.
Folia Biol (Krakow). 2012;60(3-4):175-9. doi: 10.3409/fb60_3-4.175-179.
Evaluation of dressing percentage and postmortem traits in 14-week-old white and grey guinea fowl, extended with evaluation of breast muscle microstructure, was the aim of the study. Subjects were two varieties of guinea fowl kept in an environmentally controlled house. Birds received complete commercial feeds. At 14 weeks of rearing, their whole carcasses were dissected postmortem. Diameters and percentages of white (alphaW) and red muscle fibres (betaR) were determined based on histological analysis of the musculus pectoralis superficialis. Similar dressing percentage was found in both guinea fowl varieties. At 14 weeks of age, grey guinea fowl had greater body weight, and weight and proportion of leg muscles and wings compared to white guinea fowl. Females of the white variety had greater weight of breast muscles than males. Breast muscle microstructure showed significantly (P < or = 0.05) greater content and diameter of white fibres in grey guinea fowl, and of red fibres in white guinea fowl.
本研究旨在评估14周龄白色和灰色珍珠鸡的屠宰率及宰后性状，并扩展至对胸肌微观结构的评估。实验对象为饲养在环境可控鸡舍中的两个品种珍珠鸡。鸡只饲喂完全商业化饲料。饲养14周后，对其全尸进行宰后解剖。基于胸浅肌的组织学分析，测定白色（αW）和红色肌纤维（βR）的直径及百分比。两个珍珠鸡品种的屠宰率相近。14周龄时，灰色珍珠鸡的体重、腿部肌肉和翅膀的重量及比例均高于白色珍珠鸡。白色品种的雌性胸肌重量高于雄性。胸肌微观结构显示，灰色珍珠鸡白色纤维的含量和直径显著更高（P≤0.05），而白色珍珠鸡红色纤维的含量和直径显著更高。
