L- arginine improves mammary gland vascularity and antioxidant capacity of lactating sows

• Ano de defesa: 2017
• Autor(a) principal: Holanda, Débora Muratori
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Universidade Federal de Viçosa
• Palavras-chave em Português: Suínos - Alimentações e rações; Lactação; Histologia veterinária; Aminoácidos na nutrição animal; Ciências Agrárias; Zootecnia; Nutrição e Alimentação Animal
• Link de acesso: http://www.locus.ufv.br/handle/123456789/12395

Lactating sow’s mammary glands pass through periods of metabolic burden and oxidative stress. Previous studies have shown that the supplementation of lactating sows with arginine promotes improvements in litter performance, but they do not address the physiological effects responsible for such results. The present study aimed to evaluate the mechanisms modulated by dietary arginine supplementation to sows during lactation, regarding antioxidant capacity and vascularization of mammary glands. Lactating sows were fed control diet (CON) or CON diet supplemented with 1.0% L-arginine (ARG) for 21 days. ARG fed sows presented lower mRNA expression for prolactin receptor (p = 0.002), angiopoietin1 (p = 0.030) and receptor tyrosine kinase Tie2 (p = 0.015); higher expression for prostaglandin synthase 1 (p = 0.009); trend of decrease for glucocorticoid receptor (p = 0.062) and insulin-like growth factor receptor 1 (p = 0.073); and a tendency for an increased glutathione peroxidase (p = 0.053). The angiopoietin2:angiopoietin1 mRNA ratio tended to increase (p = 0.069) in ARG fed animals. ARG fed sows demonstrated greater volumetric proportion of blood vessels (p = 0.047) and a trend of enhance in the number of blood vessels per mm 2 (p = 0.073). The outcomes pose that 1.0% L-arginine supplementation to sows activated proliferative mechanisms and enhanced antioxidant capacity at 21 days of lactation, besides promoting previous mammary tissues’ angiogenesis