Seasonal weight loss (SWL) is a major constraint to extensive animal production systems. The Australian sheep production is based on merino sheep, a European breed not tolerant to SWL. Tolerant alternative breeds such as the fat-tailed Damara and the Dorper have been increasingly used in Australia and elsewhere, due to their robustness. The aim of this study was to understand the mineral profile of muscle and liver tissues of Australian Merino, Damara and Dorper, when subjected to SWL in order to understand SWL-tolerance physiology. Twenty-four lambs were divided randomly between growing (control) and nutritionally restricted groups for each breed. The trial lasted 42 days. Animals were weighed bi-weekly and at the end of the trial, lambs were slaughtered. Liver and muscle samples were taken immediately after slaughter. Mineral assessment was carried out using inductively coupled plasma-optical emission spectrometry. Analysis of variance showed mineral concentrations were generally increased in the muscle of restricted animals, mainly because of fat tissue mobilization. An increase in Zn and Fe concentrations indicates an increase of enzymatic activity in the liver of restricted sheep as well as differential abundance of Fe-containing proteins. High concentrations of Cu in the liver of Dorper indicate higher ability to accumulate this element, even under SWL.

中文翻译：

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澳大利亚美利奴羊，达玛拉和多珀羊羔肌肉和肝组织的矿物质分布图：减肥的影响。

季节性体重减轻（SWL）是广泛的动物生产系统的主要限制因素。澳大利亚的绵羊生产以美利奴绵羊为基础，美利奴绵羊是不容忍SWL的欧洲品种。耐性替代品种，例如肥尾达玛拉（Darara）和杜泊（Dorper），由于其坚固性而在澳大利亚和其他地方越来越多地使用。这项研究的目的是为了了解澳大利亚美利奴羊，达玛拉和多珀的肌肉和肝脏组织在接受SWL疗法后的矿物质特征，从而了解SWL耐受生理。对于每个品种，将二十四只羔羊随机分为生长（对照）组和营养受限组。审判持续了42天。每两周对动物称重，试验结束时，宰杀羔羊。宰杀后立即采集肝脏和肌肉样本。矿物评估使用电感耦合等离子体发射光谱法进行。方差分析表明，受限动物的肌肉中矿物质浓度通常升高，这主要是由于脂肪组织的动员。锌和铁浓度的增加表明受限绵羊肝脏中酶活性的增加以及含铁蛋白的丰度差异。即使在SWL条件下，Dorper肝脏中的高浓度Cu也表明具有更高的积累这种元素的能力。锌和铁浓度的增加表明受限制绵羊肝脏中酶活性的增加以及含铁蛋白的丰度差异。即使在SWL条件下，Dorper肝脏中的高浓度Cu也表明具有更高的积累这种元素的能力。锌和铁浓度的增加表明受限制绵羊肝脏中酶活性的增加以及含铁蛋白的丰度差异。即使在SWL条件下，Dorper肝脏中的高浓度Cu也表明具有更高的积累这种元素的能力。