Threonine Requirement of Broiler from 22-42 Days

Abstract

Threonine is considered to be the third limiting amino acid for broilers. The aim of this study was to determine the threonine requirement of female broilers from 22 to 42 days of age. Seventy five, one-day of age female broiler chicks (Ross 308) were divided into five dietary treatment groups of similar mean weight, comprising 15 birds each, individually. They were fed a basal starter diet containing 23% CP, 3200 ME kcal/kg, 0.91% threonine and 1.10% lysine (Lys) during the first 3 weeks. At the end of the first feeding period, the broilers were randomly assigned to five dietary treatment groups receiving 0.70 (control diet), 0.75, 0.80, 0.85 and 0.90% of threonine. During the feeding period, growth performance parameters, body weight gain, feed intake and feed conversion ratio were determined. The results obtained in the experiment showed that the group receiving 0.75% threonine attained the best performance. The results of our investigation also showed that the highest body weight gain occurred at 0.75% threonine; the tendency in better feed conversion ratio in the group receiving 0.80% threonine for female broilers. Our results suggest that the current NRC (1994), recommendation of 0.74% threonine for 21 to 42 days old broilers is adequate to support relative growth performance.

Effect of Dietary Supplementation of L-Threonine on Growth Performance and Economics in Broiler Chickens

“…The results are in the agreement with earlier researcher reported that, the supplementation of 0.80% threonine in female broilers showed better feed conversion ratio (1). However, supplementation of L-threonine in broilers showed better feed conversion ratio (2,18).…”

“…Adequate digestible Threonine levels are needed to support optimum growth (13) plays an important role as precursor of lysine and serine (17). Threonine improves the livability of heat stressed broilers (1). Increased dietary threonine concentration is known to improve nitrogen retention in broiler chicks; therefore changing level of threonine concentration is an important tool to improve nitrogen utilization (7).…”

Effects of Dietary Threonine Levels and Stocking Density on the Performance, Metabolic Status and Immunity of Broiler Chickens

“…Threonine participates in protein synthesis and its catabolism produces many products important in metabolism. Threonine is considered as the third limiting amino acid after Met and Lys for broiler chicks (Kidd et al, 1999;Ayasan and Okan, 2006;Baylan et al, 2006;Ayasan et al, 2009). Kidd (2000) reported that L-Thr deficiency resulted in decreasing utilization of TSAA and Lys.…”

The Effects of Threonine on Performance Parameters, Carcass Traits, Visceral Organ Indices and Serum Biochemical Parameters of Linwu Ducks, Aged 4 to 8 Weeks

“…Thr is a typically deficient amino acid in corn, sorghum and soybean meal based rations and it becomes one of the major factors in limiting the birds' performance (Kidd, 2000). Supplementation of Thr in the diets of broiler chicks and white Pekin ducklings was reported to improve their growth performance (Horn et al, 2010;Ayasan & Okan, 2011). Khan et al (2006) conducted an experiment on commercial broiler chicks 20~35d of age with different levels of digestible Thr and observed significant improvement in body weight gain.…”

“…It is the third most limiting amino acid and plays an important role in animal growth and development (Ayasan et al, 2009;Canogullari et al, 2009;Xie et al, 2014). Thr is a typically deficient amino acid in corn, sorghum and soybean meal based rations and it becomes one of the major factors in limiting the birds' performance (Kidd, 2000).…”