Sood Vipasha, Rodas-González Argenis, Lam Stephanie, López-Campos Óscar, Segura Jose, Schwinghamer Timothy, Dugan Michael, Basarab John, Aalhus Jennifer, Juárez Manuel
Department of Food and Human Nutritional Science, Faculty of Agricultural and Food Sciences, University of Manitoba, Winnipeg, MB R3T 2N2, Canada.
Department of Animal Science, Faculty of Agricultural and Food Sciences, University of Manitoba, Winnipeg, MB R3T 2N2, Canada.
Foods. 2022 Feb 11;11(4):518. doi: 10.3390/foods11040518.
This study used 1076 crossbred steers to evaluate the effects of calf-fed and yearling-fed beef production systems, implant strategies (with and without implants), and their interactions on the primal tissue composition (lean and fat components) of individual primal cuts using complete carcass dissection data. The results indicate that production system × implant interactions affected loin and rib primal weight percentages as well as marbling ( < 0.05) but did not affect the dissectible lean and fat contents of the individual primal cut ( > 0.05). Implants increased lean and decreased fat tissue contents of primal cut; however, the production system only affected lean content in the loin ( < 0.05) and fat content in the loin, round, and rib ( < 0.05). Redundancy analysis revealed a strong association between Angus breed percentage and marbling, as well as between Simmental breed percentage and multiple primal lean traits. Response surface regression models explained less variability in the tissue composition traits in calf-fed compared with yearling-fed animals, suggesting the need for further exploration using genomic studies.
本研究使用1076头杂交阉牛，利用完整的胴体解剖数据，评估犊牛育肥和周岁牛育肥牛肉生产系统、植入策略（有植入物和无植入物）及其相互作用对各个主要切块的原始组织组成（瘦肉和脂肪成分）的影响。结果表明，生产系统×植入物的相互作用影响了腰部和肋部主要切块的重量百分比以及大理石花纹（P<0.05），但不影响各个主要切块的可解剖瘦肉和脂肪含量（P>0.05）。植入物增加了主要切块的瘦肉含量并降低了脂肪组织含量；然而，生产系统仅影响腰部的瘦肉含量（P<0.05）以及腰部、后腿和肋部的脂肪含量（P<0.05）。冗余分析表明，安格斯品种百分比与大理石花纹之间以及西门塔尔品种百分比与多个主要瘦肉性状之间存在很强的关联。响应面回归模型解释了犊牛育肥动物与周岁牛育肥动物相比，组织组成性状的变异性较小，这表明需要使用基因组研究进行进一步探索。
