Abstract The present study aimed to evaluate the effects of breed and production system on quantity and quality of milk in goats. The data obtained from two groups of Markhoz goats reared in two different regions (MS and ME), and one group of Kurdish hairy goats distributed in one region (KE) were analyzed. Environmental factors and management system for MS and ME goats were different, but ME and KE goats were reared in similar conditions. The investigated traits were daily milk production (g/day), milk composition including the percentage of fat, protein, solids non-fat, lactose, ash and density (g/cm3), as well as fatty acid compositions (g/100 g total fatty acids). The number of 1260 samples for daily milk production and milk composition, as well as 45 samples for milk fatty acid profile, were used in the analysis. The milk and fatty acid composition were determined by Lactoscan SL60 and GCMass apparatus, respectively. The least-square means of fat, protein, lactose and density were affected by the breed-production system (P 0.05). Furthermore, the effect of age of goats on daily milk production was significant (P

中文翻译：

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Markhoz 和库尔德毛山羊的牛奶特性和脂肪酸谱评估

摘要 本研究旨在评估品种和生产系统对山羊产奶量和质量的影响。分析了从两个不同地区（MS 和 ME）饲养的两组 Markhoz 山羊和分布在一个地区 (KE) 的一组库尔德毛山羊获得的数据。MS 和 ME 山羊的环境因素和管理系统不同，但 ME 和 KE 山羊的饲养条件相似。研究的性状是每日产奶量 (g/day)、牛奶成分，包括脂肪、蛋白质、非脂肪固体、乳糖、灰分和密度 (g/cm3) 的百分比，以及脂肪酸成分 (g/100 g总脂肪酸）。分析中使用了 1260 个用于每日产奶量和牛奶成分的样品，以及 45 个用于牛奶脂肪酸谱的样品。牛奶和脂肪酸组成分别由 Lactoscan SL60 和 GCMass 装置测定。脂肪、蛋白质、乳糖和密度的最小二乘均值受品种生产系统的影响（P < 0.05）。此外，山羊年龄对每日产奶量的影响显着（P