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Early-weaned piglets are subjected to various environmental and nutritional stresses that can result in overall poor performance. Several amino acids associated with the urea cycle have been shown to be critical to intestinal development and metabolism. The objective of this research was to examine performance and intestinal development in early-weaned piglets receiving diets supplemented with selected amino acids or polyamines. Forty-two Yorkshire piglets (3.94 ± 0.43 kg) weaned at ~12.5 d were randomly assigned to diets supplemented with either arginine, glutamate, citrulline, ornithine or polyamines, at levels of 0.93, 6.51, 0.94, 0.90 and 0.39%, respectively. Diets were fed for 12 d and various parameters to assess growth and intestinal development were measured. Glutamate supplementation enhanced both total and mucosal growth in several sections of the small intestine (P < 0.05), whereas polyamines were detrimental to intestinal growth. Arginine and glutamate supplementation prevented weaning-induced villus atrophy in the duodenum, compared with both the control and polyamine-fed pigs (P = 0.004). These results indicate that glutamate and arginine supplementation may enhance intestinal development of the early-weaned piglet, whereas polyamine supplementation at the ratios and concentrations used in this experiment is not recommended in typical early-weaned piglet diets

Intestinal development of early-weaned piglets receiving diets supplemented with selected amino acids or polyamines