Kokoszyński Dariusz, Włodarczyk Karol, Żochowska-Kujawska Joanna, Kotowicz Marek, Wegner Marcin, Stęczny Kamil, Cygan-Szczegielniak Dorota
Department of Animal Breeding and Nutrition, Bydgoszcz University of Science and Technology, 85084 Bydgoszcz, Poland.
Department of Animal Breeding and Nutrition, Bydgoszcz University of Science and Technology, 85084 Bydgoszcz, Poland.
Poult Sci. 2025 Feb;104(2):104772. doi: 10.1016/j.psj.2025.104772. Epub 2025 Jan 3.
This research aimed to determine the effect of intramuscular fat (IMF) levels in m. pectoralis major on carcass weight and composition, meat of male broiler chickens. Whole eviscerated necked carcasses of Ross 308 male broiler chickens aged 42 days were purchased from a commercial poultry slaughterhouse. After the carcasses were dissected, m. pectoralis major was sampled to determine their basic chemical composition, physicochemical and sensory characteristics, texture, and microstructural characteristics. The IMF content of the m. pectoralis major evaluated male Ross 308 broiler chickens at 42 days of age ranged from 0.88 % to 4.64 %. The majority (about 66 %) carcasses contained pectoral muscle containing no more than 2.04 % IMF. Male broiler chicken carcasses differed (P < 0.05) in IMF, water, and protein content of m. pectoralis major. Breast muscles of Ross 308 chickens with the highest IMF levels (2.05-4.64 %) had significantly less water and protein compared to those of chickens with the lowest (0.88-1.60 %) and medium (1.61-2.04 %) IMF levels. IMF level had no effect on carcass weight and composition, physicochemical characteristics, texture, and microstructure of m. pectoralis major. To date, there have been no studies determining the effect of IMF level on microstructure and texture traits of m. pectoralis major (except WB shear force) and electrical conductivity in Ross 308 broiler chickens. The results obtained indicate the need for future research in this area with consideration of males and females and research material from multiple sources.
本研究旨在确定42日龄雄性肉鸡胸大肌中肌内脂肪（IMF）水平对胴体重量、组成及肉质的影响。从一家商业家禽屠宰场购买了42日龄的罗斯308雄性肉鸡的全净膛去头胴体。对胴体进行解剖后，采集胸大肌样本以测定其基本化学成分、理化和感官特性、质地及微观结构特征。42日龄雄性罗斯308肉鸡胸大肌的IMF含量在0.88%至4.64%之间。大多数（约66%）胴体的胸肌IMF含量不超过2.04%。42日龄雄性肉鸡胴体胸大肌的IMF、水分和蛋白质含量存在差异（P<0.05）。与IMF水平最低（0.88 - 1.60%）和中等（1.61 - 2.04%）的罗斯308肉鸡相比，IMF水平最高（2.05 - 4.64%）的鸡胸肉水分和蛋白质含量显著更低。IMF水平对胸大肌的胴体重量、组成、理化特性、质地和微观结构没有影响。迄今为止，尚无研究确定IMF水平对罗斯308肉鸡胸大肌微观结构和质地性状（除了华纳-布拉茨勒剪切力）以及电导率的影响。所得结果表明，未来需要在该领域开展研究，考虑雄性和雌性以及来自多个来源的研究材料。
