Bavarian State Research Center for Agriculture, Institute for Animal Nutrition and Feed Management, Prof.-Duerrwaechter-Platz 3, 85586 Poing-Grub, Germany.
Technical University of Munich, Liesel-Beckmann-Strasse 2, 85354 Freising, Germany.
Meat Sci. 2022 Feb;184:108685. doi: 10.1016/j.meatsci.2021.108685. Epub 2021 Sep 25.
Data on chemical body composition of cattle serve as a basis for recommendations on energy and nutrient requirements. Relevant data of growing dual-purpose Fleckvieh (German Simmental) bulls are scarce and originate from old trials, covering low rates of gain and live weights. Hence, the aim of the study was to analyze the body tissue distribution, chemical composition, and composition of body weight gain of growing Fleckvieh bulls within a 120-780 kg live weight range. Results showed that body composition changed during growth but was not affected by dietary energy concentration. Changes in body composition were characterized by increasing shares of fat tissue and ether extract. Body tissues as blood, organs, gastrointestinal tract, and bone proportionately decreased during growth, while muscle and tendon proportions remained constant. The bulls featured enhanced growth potential and high muscle and protein gain throughout the described weight range. The requirements for metabolizable protein in relation to energy decrease with increasing live weight of the animals.
牛体化学成分数据可作为制定能量和营养需求建议的基础。关于生长双用途弗莱维赫（德国西门塔尔牛）公牛的相关数据很少，而且源自于旧试验，涵盖了低增重率和活体体重。因此，本研究旨在分析生长弗莱维赫公牛在 120-780 公斤活体体重范围内的体组织分布、化学成分和体重增加组成。结果表明，体成分在生长过程中发生变化，但不受日粮能量浓度的影响。体成分的变化表现为脂肪组织和乙醚提取物比例的增加。在生长过程中，血液、器官、胃肠道和骨骼等体组织的比例相应减少，而肌肉和肌腱的比例保持不变。这些公牛在整个描述的体重范围内表现出较高的生长潜力和高肌肉及蛋白质增重。随着动物活体体重的增加，用于代谢蛋白的能量需求减少。
