Nutritional requirements of digestible threonine for growing meat-type quails

Abstract

-The objective of this study was to estimate the nutrient requirements of digestible threonine for meat-type quails (Coturnix coturnix sp) in the growth phase. A total of 1350 not sexed meat-type quails were distributed in a completely randomized design with six threonine levels (10.80, 11.50, 12.20, 12.90, 13.60 and 14.30 g/kg as fed), five replications and 45 quails per experimental unit, from 1 to 14 days of age. The threonine levels in the diet had a quadratic effect on body weight, feed intake and weight gain. Estimates for highest body weight (79.41 g), feed intake (128.96 g/bird) and weight gain (70.73 g) were observed with diets containing 12.60 g/kg of digestible threonine. According to the LRP model, the threonine intake was estimated at 13.40 g/kg of digestible threonine. Protein deposition rate and energy retained in the carcass showed quadratic effect, with estimated digestible threonine levels of 11.80 and 12.00 g/kg in the diet for maximum protein deposition rate (2.00 g/bird) and retained energy in the carcass (15.88 kcal/g), respectively. There was a linear effect on feed cost per kg of live weight gain as threonine levels were increased. Nutritional requirement of digestible threonine for meat-type quails for maximum growth is 12.60 g/kg, corresponding to a digestible threonine:digestible lysine ratio of 67.02.

Interactive effects of threonine levels and protein source on growth performance and carcass traits, gut morphology, ileal digestibility of protein and amino acids, and immunity in broilers

“…This appetitive effect may have triggered the appetite regulating mechanisms in broilers. The accelerated growth performance observed in the broilers consuming Thr supplemented diets, additionally, because of its role in synthesis of protein and maintenance of body protein turnover (Ton et al, 2013 ). These findings are in agreement with a few recent findings in broilers (Shirzadegan et al, 2015 ; Min et al, 2017 ; Zarrin-Kavyani et al, 2018 ).…”

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

“…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, ). The accelerated growth rate in treatment groups showed the importance of adequate intake of feed and protein in terms of amino acids for muscle protein deposition, protein synthesis and maintenance of body protein turnover in addition to the calcium and phosphorous necessary for bone tissue formation during the experimental period.…”

Digestible Threonine to Lysine Ratios for Meat-Type Quails

“…Adequate threonine intake is important particularly during more advanced growth stages in quails with high potential for lean meat accretion, because threonine requirements for maintenance is proportionally high relative to the other amino acids due to its high content in endogenous intestinal secretions (Fernandez et al, 1994;Kidd 2001;Sigolo et al, 2017). Ton et al (2013) threonine requirements for 1-to 14-d-old meat-type quails, and reported a quadratic effect on feed intake and weight gain, estimating a requirement of 12.60 g digestible threonine/kg of diet, which is equivalent to a 67% Thr:Lys ratio. Dozier et al (2015) reported an average minimum digestible Thr:Lys ratio of 0.67% for 1-to 14-d-old male broilers for weight gain and feed conversion ratio.…”