Dietary glycine+serine responses of male broilers given low-protein diets with different concentrations of threonine

• Published in: British poultry science Vol. 54; no. 4; pp. 486 - 493
• Main Authors: Ospina-Rojas, I.C, Murakami, A.E, Moreira, I, Picoli, K.P, Rodrigueiro, R.J.B, Furlan, A.C
• Format: Journal Article
• Language: English
• Published: England Taylor & Francis 01.08.2013
• Subjects: ammonia; Animal Feed - analysis; Animal Nutritional Physiological Phenomena; Animals; broiler chickens; Chickens - growth & development; Chickens - metabolism; Creatine - metabolism; Diet - veterinary; Diet, Protein-Restricted - veterinary; Dietary Proteins - administration & dosage; Dietary Proteins - metabolism; Dietary Supplements - analysis; Digestion - drug effects; Dose-Response Relationship, Drug; feed conversion; glycine (amino acid); Glycine - administration & dosage; Glycine - metabolism; low protein diet; Male; muscles; Pectoralis Muscles - drug effects; Pectoralis Muscles - metabolism; serine; Serine - administration & dosage; Serine - metabolism; threonine; Threonine - administration & dosage; Threonine - metabolism; uric acid; Uric Acid - blood
• ISSN: 1466-1799; 0007-1668; 1466-1799
• DOI: 10.1080/00071668.2013.794257

1. The objective of this study was to determine the optimum glycine+serine (Gly+Ser) concentration in low-crude protein (CP) diets that have adequate or high concentrations of dietary threonine (Thr) for broiler chickens in the initial growth phase.2. Treatments consisted of four concentrations of dietary Gly+Ser (18.4; 19.8; 21.2 and 22.6 g/kg) and two concentrations of dietary Thr (9.3 and 10.7 g/kg, corresponding to 100 and 115% of the required Thr, respectively).3. At 21d, interactions were observed between dietary Gly+Ser and Thr concentrations for the feed conversion ratio, creatine content in the pectoral muscles and serum concentrations of uric acid. There was a quadratic effect of the concentrations of Gly+Ser in the diets with 9.3 g Thr/kg on the feed conversion ratio and creatine content in the pectoral muscles, with an optimisation concentration of 20.8 and 21.1 g Gly+Ser/kg, respectively.4. Diets containing 10.7 g Thr/kg negatively affected the feed conversion ratio, relative breast weight, creatine content in the pectoral muscles, serum concentrations of uric acid and ammonia in poultry compared to diets containing 9.3 g Thr/kg.5. The need for Gly+Ser in diets with low-protein concentration (190 g CP/kg) and adequate concentration of Thr (9.3 g/kg) is 20.8 g/kg for broilers in the 1- to 21-d phase.