The response in growth performance, relative organ weight, blood profiles, and meat quality to dietary threonine: lysine ratio in broilers

Abstract

A total of 520 Ross 308 broilers with initial BW of 45.3290.27 g were used to evaluate the effects of the dietary total threonine:lysine ratio (Thr:Lys) on the growth performance, relative organ weight, blood profile, and meat quality. Broilers were randomly assigned to 4 treatments (10 replications per treatment with 13 broilers per replication), the Thr:Lys ratios of diets were set at 0.65 (T65), 0.70 (T70), 0.75 (T75), and 0.80 (T80), respectively. The Lys levels of different phases were formulated at 1.42, 1.24, and 1.13%, respectively. The body weight gain (BWG) was improved (P B0.05) in T75 treatment compared with T80 treatment during wk 1Á3. During the overall period (0Á4 wk), broilers fed with T70 and T75 diets had higher a BWG than broilers fed with T65 and T80 diets. The relative organ weight was unaffected by dietary Thr:Lys ratio. The blood creatinine concentration was increased in T80 treatment (PB0.05) compared with T70 and T75 treatments. The meat quality was unaffected by Thr:Lys ratio among treatments. In conclusion, the Thr:Lys ratio at 0.70Á0.75 improved the growth performance without negative effects on relative organ weight and meat quality in broilers.

The effects of supplemental threonine on performance, carcass characteristics, immune response and gut health of broilers in subtropics during pre‐starter and starter period

“…Our present trial is in agreement with few others (Khan, Nawaz, & Zahoor, ; Kidd et al, ; Shan et al, ) who reported that the dietary supplementation of threonine significantly increased the feed intake between experimental groups. The dietary supplementation of threonine significantly increased the ADG between experimental groups (Estalkhzir, Khojasteh, & Jafari, ; Madapurada, Neraj, Sushma, Krishnamurthy, & Ananda, ; Majumder, Das Chowdhury, Zakir Hossain, & Islam, ; Zhang & Kim, ). The accelerated growth found in threonine supplemented groups might be related to the role of threonine, which is required for protein synthesis and maintenance of body protein turnover (Madapurada et al, and Ton et al, ).…”

Effect of Mulberry Leaf TMR on Growth Performance, Meat Quality and Expression of Meat Quality Master Genes (ADSL, H-FABP) in Crossbred Black Goats

“…The composition and content of amino acids in muscle directly affect the nutritional value and flavor of meat [ 49 ]. Thr helps to promote growth, maintain body protein equilibrium and regulate the function of endocrine homeostasis [ 63 ]. Val can regulate amino acid and lipid metabolism and is related to the nervous and endocrine systems; some studies have shown that adding Val to the diet helps piglets grow [ 64 ].…”

Nutritional Strategies to Improve Meat Quality and Composition in the Challenging Conditions of Broiler Production: A Review

“…A previous study by Kop-Bozbay et al [ 134 ] showed that the dietary supplementation of BCAA ((1.0, 0.25, and 0.75 g/kg of L-leucine, L-isoleucine, and L-valine compared to the control (non-supplementation)) was detrimental for the meat yield of broilers under heat stress conditions, potentially due to antagonistic interactions between valine and isoleucine [ 134 ]. Zhang and Kim [ 135 ] reported that the supplementation of threonine (0.65, 0.70, 0.75, and 0.80 threonine to lysine ratios) did not influence meat quality in broiler chickens. While Aas are important building blocks and their specific functions have the potential to improve meat quality, the supplementation of Aas does not guarantee improvements in the meat yield or quality of broiler chickens.…”