A comparative study on growth, feed intake, and serum vitamin and mineral concentrations in Western white-faced rams with and without limb deformities.
D M Laverell, T W Murphy, T E Engle, J M Smylie, A J Kersh, S I Jacob, W C Stewart
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引用次数: 0
Abstract
Angular limb deformities (ALD) have historically affected a portion of ram lambs enrolled in central performance tests. The condition results in varying degrees of abnormal ossification in long bones and can impact animal welfare and performance under extensive rangeland conditions. The objectives of this experiment were to compare growth rate, feed intake, and serum 25-hydroxyvitamin D [25(OH)D], and mineral element concentrations of rams affected and unaffected with ALD. In total, 108 ram lambs were enrolled in a central performance test and a subset of 25 were selected for the present study (191 ± 25 d of age; n = 12 ALD, n = 13 non-affected). Body weight (BW) and serum were collected on d 0, 28, 56, 83, and 112 of the test. Serum concentrations of 25(OH)D, macrominerals (Ca, Cl, K, Mg, Na, P, and S), and microminerals (Co, Cr, Cu, Fe, Mn, Mo, and Se) were quantified. Traits were analyzed as repeated measures with fixed effects of ALD status, sampling timepoint, and their interaction. The ALD status × sampling timepoint interaction was significant (P < 0.05) for serum 25(OH)D and Mg concentrations. Rams with ALD had greater serum 25(OH)D concentration at d 83 (45.0 ± 1.31 vs. 39.2 ± 1.25 ng/ml; P < 0.01) and 112 (52.5 ± 1.63 vs. 44.8 ± 1.29 ng/ml; P < 0.001) and greater Mg concentration at d 112 (32.0 ± 2.90 vs. 22.5 ± 2.14 mg/L; P ≤ 0.01). Rams with ALD had greater serum Cl (3672 ± 38.8 vs. 3500 ± 38.3 mg/L; P < 0.001) and lower serum Cu (1.55 ± 0.07 vs. 1.77 ± 0.07; P = 0.04) than non-affected rams. However, BW, average daily gain, feed intake, feed conversion rate, and serum concentration of all other mineral were similar elements (P ≥ 0.06) between ALD and non-affected rams. While ALD and non-affected rams differed in key serum vitamin and mineral element concentrations, it is a multifaceted disorder in which perinatal, endocrine, genetic, and nutritional conditions need to be researched to fully understand the etiology and mitigate its incidence.
角状肢体畸形（ALD）历来影响了一部分参加中央性能测试的公羊羔羊。这种情况导致长骨不同程度的异常骨化，并可能影响动物福利和在广阔牧场条件下的生产性能。本试验的目的是比较患有和未患ALD的公羊的生长速度、采食量、血清25-羟基维生素D [25(OH)D]和矿物质元素浓度。共有108只公羊羔羊参加了中心性能测试，其中25只羔羊被选中参加本研究(191±25日龄；n = 12 ALD, n = 13 non-affected)。于试验第0、28、56、83、112天采集体重和血清。测定血清25(OH)D、大量矿物质（Ca、Cl、K、Mg、Na、P和S）和微量矿物质（Co、Cr、Cu、Fe、Mn、Mo和Se）的浓度。性状分析为重复测量，具有ALD状态、采样时间点及其相互作用的固定效应。ALD状态与采样时间点交互作用显著（P P P P≤0.01）。ALD的公羊血清Cl含量较高（3672±38.8 vs 3500±38.3 mg/L）；P = 0.04)。而ALD与正常公羊的体重、平均日增重、采食量、饲料系数和血清中其他矿物质含量基本相同（P≥0.06）。虽然ALD和未受影响的公羊在关键的血清维生素和矿物质元素浓度上存在差异，但它是一种多方面的疾病，需要对围产期、内分泌、遗传和营养状况进行研究，以充分了解其病因并减轻其发病率。
期刊介绍：
Translational Animal Science (TAS) is the first open access-open review animal science journal, encompassing a broad scope of research topics in animal science. TAS focuses on translating basic science to innovation, and validation of these innovations by various segments of the allied animal industry. Readers of TAS will typically represent education, industry, and government, including research, teaching, administration, extension, management, quality assurance, product development, and technical services. Those interested in TAS typically include animal breeders, economists, embryologists, engineers, food scientists, geneticists, microbiologists, nutritionists, veterinarians, physiologists, processors, public health professionals, and others with an interest in animal production and applied aspects of animal sciences.
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