1023 - ¬ INTRODUCTION¬ The nonprotein synthesis roles of...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ¬° INTRODUCTION¬° The nonprotein synthesis roles of Gly are as a precur- sor to glutathione, nucleic acid bases, heme, creatine, and bile acids along with methyl group metabolism (Reeds and Mersmann, 1991). These roles along with Gly being a component of uric acid and protein struc- ture make it an essential amino acid for poultry. The supplementation of Gly to a 16% CP broiler starter diet restored growth performance similar to a positive control diet (Dean et al., 2006). Further investigation within our laboratory showed that Gly supplementa- tion improved feed efficiency of broilers fed a typical corn and soybean meal ( C-SBM ) diet that was ad- equate in all nutrients (Waguespack et al., 2008). Simi- lar improvement in feed efficiency was also observed in reduced CP diets with varying levels of Lys and TSAA (Powell et al., 2009). The increase in G:F that resulted from Gly supplementation was not always accompanied by increased ADG, indicating that the increased G:F observed in these reports was not always the result of increased protein synthesis, but of increased utilization of nutrients. All diets that responded to Gly supplementation in our laboratory had a dietary Cys level of 0.34 to 0.35%. This level of Cys is lower than the 0.40% recommended for 0- to 21-d-old broilers (NRC 1994). Also, within the literature, differences exist in the reported Cys re- quirement for broilers within the 0- to 21-d age range. Kalinowski et al. (2003) reported that the Cys require- ment for 0- to 21-d-old male broilers ranged from 0.39 to 0.44% of the diet depending on the rate of feath- ering, whereas Moran (1980) reported a Cys require- ment of 0.41 and 0.46% Cys for 0- to14-d-old male and female broilers, respectively. These reports (Moran, 1980; Kalinowski et al., 2003) indicate that the level of Cys in the diets that responded to Gly supplementa- tion (Waguespack et al., 2008; Powell et al., 2009) was Effects of glycine supplementation at varying levels of methionine and cystine on the growth performance of broilers fed reduced crude protein diets 1 S. Powell, T. D. Bidner, and L. L. Southern 2 School of Animal Sciences, Louisiana State University Agricultural Center, Baton Rouge 70803 ¬°ABSTRACT¬°¬° Two experiments were conducted to inves- tigate Gly addition to reduced crude protein corn‚Äďsoy- bean meal (C-SBM) diets with varying levels of TSAA achieved by varying Met and Cys. The experiments were conducted with female Ross 708 broilers in brood- er batteries from 0 to 18 d posthatching. Treatments had 6 replicates with 6 broilers/pen. Diets in all experi- ments were fed without or with Gly supplementation to contain 2.32% total Gly + Ser. All diets were C-SBM based and formulated to contained 1.27% standard- ized ileal digestible Lys supplemented with 0.20% Lys (0.394% Lys¬∑SO 4 ) and to meet or exceed the require- ment of all nutrients except Met and Cys where appro- priate. Experiment 1 consisted of 8 dietary treatments....
View Full Document

This note was uploaded on 07/28/2011 for the course VET 4335 taught by Professor Sakomura during the Spring '11 term at University of the South Pacific, Fiji.

Page1 / 5

1023 - ¬ INTRODUCTION¬ The nonprotein synthesis roles of...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online