Federal University of Mato Grosso do Sul, College of Veterinary Medicine and Animal Science, Av. Senador Filinto Muller, 2443, Postal Code: 79074-460 Campo Grande, Brazil.
State University of Ponta Grossa, Department of Animal Science, Av. General Carlos Cavalcanti, 4748, Postal Code: 84030-000 Ponta Grossa, Brazil.
Meat Sci. 2021 Jan;171:108281. doi: 10.1016/j.meatsci.2020.108281. Epub 2020 Aug 18.
The present study estimated genetic parameters and evaluated the genetic and phenotypic correlations between meat quality characteristics of Nellore cattle evaluated at different anatomical points of the longissimus. Data from 1329 Nellore young bulls were used to evaluate, in the 5th and 12th ribs, marbling score (MAR), shear force (SF), cooking weight losses (CWL) and intramuscular fat (IMF). In addition, the subcutaneous fat thickness was measured at the 12th rib (SFT) and between the last lumbar and the first sacral vertebrae (SFT), in the separation of loin and round. Results yielded moderate heritability coefficients for evaluated characteristics, except CWL. High genetic correlations (0.61) were found between measurements of SFT and SFT. MAR, IMF and SF were evaluated at the 5th and 12th rib. Meat quality and subcutaneous fat thickness measured at different anatomical points of the longissimus are genetically correlated and can be used in genetic selection programs to improve meat quality characteristics in Nellore cattle.
本研究估计了遗传参数，并评估了在长肌不同解剖部位评估的内罗尔牛的肉质特性之间的遗传和表型相关性。使用了 1329 头内罗尔年轻公牛的数据，以评估第 5 肋骨和第 12 肋骨的大理石纹评分（MAR）、剪切力（SF）、烹饪重量损失（CWL）和肌内脂肪（IMF）。此外，还在第 12 肋骨处（SFT）和最后腰椎与第一荐椎之间（SFT）测量了皮下脂肪厚度，在腰肉和圆形肉的分离处。结果表明，除了 CWL 之外，所评估特征的遗传力系数适中。在 SFT 和 SFT 之间发现了高度的遗传相关性（0.61）。MAR、IMF 和 SF 在第 5 肋骨和第 12 肋骨处进行了评估。在长肌的不同解剖部位测量的肉质和皮下脂肪厚度具有遗传相关性，可用于遗传选择计划，以改善内罗尔牛的肉质特性。
