Blood parameters as a possible indicator of feed efficiency in Nellore bulls

Alana Maria Menezes Di Calaça, V. Couto, Leonardo Frederico N Souza, É. G. Moraes, T. P. Guimarães, Juliano José de Resende Fernandes
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Abstract

The objective of this study was to investigate the relationships between energy, protein, enzymatic metabolism, and residual feed intake (RFI) in purebred Nellore bulls. A total of 120 Nellore bulls, individually housed, underwent performance trials while being fed a high-concentrate diet. The study utilized data from the 10 most efficient, least efficient, and moderately efficient animals. Blood samples were collected via venipuncture for a complete blood count, and serum was analyzed for albumin, total protein, urea, creatinine, glucose, cholesterol, gamma GT, AST, and alkaline phosphatase. The data were subjected to a completely randomized design with three treatments and 10 replicates, and treatment means were compared using the Tukey test. Pearson's linear correlation analysis was performed. The most efficient animals demonstrated a 27.62% reduction in feed intake compared to the least efficient ones. No significant differences were observed in the serum biochemistry between different RFI classes. Inefficient animals exhibited elevated mean corpuscular hemoglobin (MCH), a red blood cell index, which correlated with RFI, gain-to-feed ratio, and dry matter intake (r = 0.46, 0.42, and -0.42, respectively). Hemoglobin concentration showed correlations with RFI and gain-to-feed ratio (r = 0.36, -0.41, respectively). These findings suggest potential variations in oxygen-carrying capacity. Red blood cell parameters could serve as biomarkers for identifying inefficient animals.
血液参数是衡量内洛尔公牛饲料效率的可能指标
本研究旨在调查纯种内洛尔公牛的能量、蛋白质、酶代谢和剩余采食量(RFI)之间的关系。共有 120 头内洛尔公牛单独饲养,在饲喂高浓缩饲料的同时进行了性能试验。研究利用了 10 头效率最高、效率最低和效率中等的动物的数据。研究人员通过静脉穿刺采集血样进行全血细胞计数,并对血清中的白蛋白、总蛋白、尿素、肌酐、葡萄糖、胆固醇、γ GT、谷草转氨酶和碱性磷酸酶进行分析。数据采用完全随机设计,3 个处理 10 个重复,处理平均值采用 Tukey 检验进行比较。进行了皮尔逊线性相关分析。与效率最低的动物相比,效率最高的动物采食量减少了 27.62%。不同RFI等级的动物血清生化指标无明显差异。低效率动物的平均血红蛋白(MCH)(一种红细胞指数)升高,这与 RFI、增重采食比和干物质采食量相关(r = 0.46、0.42 和 -0.42)。血红蛋白浓度与 RFI 和增重-采食比相关(r = 0.36,-0.41)。这些发现表明携氧能力存在潜在差异。红细胞参数可作为识别低效动物的生物标志物。
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