animals Review The Probable Use of Genus amaranthus as Feed Material for Monogastric Animals Tlou Grace Manyelo 1,2 , Nthabiseng Amenda Sebola 1 , Elsabe Janse van Rensburg 1 and Monnye Mabelebele 1,* 1 Department of Agriculture and Animal Health, College of Agriculture and Environmental Sciences, University of South Africa, Florida 1710, South Africa;
[email protected] (T.G.M.);
[email protected] (N.A.S.);
[email protected] (E.J.v.R.) 2 Department of Agricultural Economics and Animal Production, University of Limpopo, Sovenga 0727, South Africa * Correspondence:
[email protected]; Tel.: +27-11-471-3983 Received: 13 July 2020; Accepted: 5 August 2020; Published: 26 August 2020 Simple Summary: In monogastric production, feeds account for about 50–70% of the total costs. Protein ingredients are one of the most expensive inputs even though they are not included in large quantities as compared to cereals. Monogastric animal industries are faced with a major problem of limited protein sources, moreover, the competition for plant materials is expected to further increase feed prices. Therefore, to tackle this problem, interventions are required to find alternative and cost-effective protein sources. One identified crop that meets these requirements is amaranth. Studies have shown the potential and contribution that amaranth has as an alternative ingredient in diets for monogastric animals. Therefore, the main purpose of this review is to provide a detailed understanding of the potential use of amaranth as feed for monogastric animals, and further indicate processing techniques are suitable to improve the utilization of grain amaranth and leaves.