受威胁的当地牲畜遗传资源的保护涉及对其进行表征以实施保护策略。Utrrana是地中海型的鸡品种，列入西班牙牲畜品种官方目录和粮食及农业组织(粮农组织)国内动物多样性信息系统(DAD-IS)，原产于西班牙南部，1926年由Utrera（塞维利亚省）的一位农民创建。它被选择用于铺设性能，并具有四个羽毛品种(白色，黑色,黑条和Partridge)，达到每只母鸡每年180个鸡蛋的平均产量。它在20世纪下半叶被广泛用于商业农业，随后在20世纪下半叶因改良的外国品种和品系的传播而流离失所。Utrrana品种从那时起就因其美学价值和后院系统而饲养，受到脆弱的当地风险状态的威胁（2022年为1822只鸟类，趋势越来越大），并且随着生产力选择的停止，其产蛋性能恶化。该品种很少受到研究界的关注。因此,这项工作旨在回顾有关起源的文献，选择,品种种群的遗传和生产特征以及状况，以及保护策略。乌特瑞拉纳鸡是一个多态品种，表现出很高的遗传多样性，品种间的性二态和形态功能差异。目前,Utrrana母鸡从6个月大开始产蛋，一只母鸡每年产下94-121个高质量鸡蛋(59-64克)，显示季节性。这是一种生长缓慢的品种，公鸡的成熟体重为2.4-2.6kg，母鸡的成熟体重为1.9-2.0g。Utrrana鸡品种质朴，适合替代养殖系统。这篇综述已经确定了需要填补的研究空白，例如，对乌特拉纳鸡的尸体和肉质进行表征，并证明有必要努力推广该品种并扩大其种群。
The conservation of threatened local livestock genetic resources involves characterising them to implement conservation strategies. The Utrerana is a Mediterranean-type chicken breed, included in the Official Catalogue of Livestock Breeds of Spain and in the Domestic Animal Diversity Information System (DAD-IS) of the Food and Agriculture Organization (FAO), native to south Spain created in 1926 by a farmer from Utrera (Seville province). It was selected for laying performance and with four plumage varieties (White, Black, Black-barred and Partridge), reaching average yields of 180 eggs per hen per year. It was widely used in commercial farming in the second quarter of the 20th century, being subsequently displaced in the second half of the 20th century by the spreading of the improved foreign breeds and lines. The Utrerana breed was reared from then on for its aesthetic values and in backyard systems, being endangered with a vulnerable local risk status (1822 birds in 2022 with an increasing trend) and having worsened its laying performance as selection for productivity ceased. The breed has received little attention from the research community. Therefore, this work aims to
review the literature on the origin, selection, genetic and productive characterisation and status of the populations of the breed, as well as the conservation strategies. The Utrerana chicken is a polymorphic breed showing high genetic diversity, sexual dimorphism and morpho-functional differences among varieties. Currently, Utrerana hens start laying at 6 months of age, and a hen lays 94-121 high quality eggs (59-64 g) per year, showing seasonality. It is a slow-growing breed with mature weights of 2.4-2.6 kg for roosters and 1.9-2.0 g for hens. The Utrerana chicken breed is rustic and adapted to alternative farming systems. This
review has identified research gaps to be filled, such as characterising the carcass and meat quality of the Utrerana chicken, and evidences the need to make efforts to promote the breed and expand its populations.
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