Effect of dietary near ideal amino acid profile on heat production of lactating sows exposed to thermal neutral and heat stress conditions

• Published in: Journal of animal science and biotechnology 2020-07, Vol.11 (1), p.75-75, Article 75
• Main Authors: Zhang, S, Johnson, J S, Trottier, N L
• Format: Article
• Language: English
• Subjects: Amino acid; Amino acids; Body temperature; Diet; Enthalpy; Gas exchange; Heat; Heat exchange; Heat stress; Heat tolerance; High protein diet; Hogs; Humidity; Ingredients; Lactating sows; Lactation; Litter; Litter size; Low protein diet; Lysine; Metabolism; Milk production; Nitrogen; Nutrient deficiency; Physiology; Proteins; Rectum; Reduction; Respiration; Soybeans; Total heat production; Vagina; Weaning
• ISSN: 1674-9782; 2049-1891; 2049-1891
• DOI: 10.1186/s40104-020-00483-w

Reduced protein diet manifested potential to mitigate heat production based on the concept of ideal amino acid profile. The hypothesis of this study was that lactating sows fed a low crude protein (LCP) diet with supplemental amino acid produce less heat compared to those fed a high crude protein (HCP) diet under both thermal neutral (TN) and heat stress (HS) conditions. Thirty-two lactating sows were allotted to HCP (193 g CP/kg) and LCP (140 g CP/kg) diets under thermal neutral (TN, 21 ± 1.5 °C) or cycling heat stress (HS, 32 ± 1.5 °C daytime and 24 ± 1.5 °C nighttime) conditions. Diets contained 0.90% SID lysine and 10.8 MJ/kg net energy. Positive pressure indirect calorimeters were used to measure gas exchange in individual sows with litters, and individual piglets on days 4, 8, 14 and 18. Sow and litter weights were recorded on days 1, 10 and 21. Sow total heat production (THP) was calculated by subtracting litter THP from sow + litter THP based on BW . Sow BW and body protein (BP) loss was greater for LCP diet compared to HCP diet in peak lactation (