The knowledge of the importance of nutrition on animal reproduction is well known for producers and researchers for a long time. However, contemporary studies have brought new perspectives and further details of this relationship, allowing fine-tuning of diets handling in order to increase production and reproduction in ruminants. Nevertheless, especially in high-producing dairy cows, there are still serious multifactorial fertility problems, with a heavy nutritional involvement. In contrast, addition of certain ingredients to the diet, such as fat rich in polyunsaturated fatty acids and reducing the supply of rumen degradable protein have on several occasions, resulted in an increased reproductive performance in dairy and beef cattle. Thus, this article presents and discusses results of some relevant papers on this subject, especially those related to the influence of energy or protein on reproduction.
bovine; energy; fat; fertility; physiology; protein