Nutritional supplements are widely used in the equine industry with the aim of improving horse health, sports or reproductive performances. Over the years, a number of studies have focused on investigating the effects of several dietary compounds on the quality and preservation of stallion semen. This paper reviews the literature available on the use of nutritional supplementation for the improvement of reproductive performance and semen quality in equine species, critically appraising the benefits and negative effects of several compounds found in complementary feeds such as PUFAs from different sources, vitamins and antioxidants, carnitine and botanical extracts. Different nutraceuticals have been highlighted to improve stallion fertility by providing optimal levels of antioxidants, with the most promising results obtained by the combination of PUFAs and antioxidants that resulted to be essential for the maintenance of normal reproductive functions and the reduction of cryodamage in cooled and frozen equine semen.

中文翻译：

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在种马中使用营养保健品：对精液质量和保存的影响

营养补充剂广泛用于马业，目的是改善马的健康、运动或繁殖性能。多年来，许多研究集中在调查几种膳食化合物对种马精液质量和保存的影响。本文回顾了有关使用营养补充剂改善马种繁殖性能和精液质量的现有文献，批判性地评估了在补充饲料中发现的几种化合物的益处和负面影响，例如来自不同来源的多不饱和脂肪酸、维生素和抗氧化剂，肉碱和植物提取物。通过提供最佳水平的抗氧化剂，不同的营养食品已被强调以提高种马的生育能力，