2‐Hydroxy‐4‐methylthio butanoic acid and DL‐methionine for Japanese quails in production

Abstract

An experiment was performed using 1,000 laying Japanese quails to assess the availability of two alternative dietary methionine sources. Treatment 01 = Basal Feed that is deficient in digestible methionine + cystine (Met + Cys). The other treatments were constituted by Met + Cys levels of 0.8, 1.60 and 2.40 g/kg, supplemented with DL-Methionine-99%, HMTBA-88% and HMTBA-84%, being 10 treatments in total. The following characteristics were studied: feed intake (g/bird/day), egg production (egg/day × 100), egg weight (g/egg), egg mass (g/egg), feed conversion per egg dozen (kg feed/dozen eggs), feed conversion per egg mass (kg feed/kg eggs), relative yolk weight (g/100 g of egg), relative albumen weight (g/100 g of egg), relative shell weight (g/100 g of egg), shell thickness (mm) and specific gravity (g/cm ). In general result comment, supplemental methionine sources must be included in the poultry diet. The different methionine sources affect the performance of quails, and the increase in the levels within each source improves the performance variables. Significant effect was observable on performance variables and egg quality variables, being that DLM-99% is superior to the other sources. The HMTBA-88% source is superior to the HMTBA-84% source for the same aforementioned variables. In conclusion, the bioefficacy values of the HMTBA-88% and HMTBA-84% sources compared to the DLM-99% source on an equimolar basis were 81 and 79%, respectively, for the performance variables, and 83 and 74 while the methionine sources were equivalent for the variables related to egg quality.

Effect of Methionine Deficiency on the Growth Performance, Serum Amino Acids Concentrations, Gut Microbiota and Subsequent Laying Performance of Layer Chicks

“…Previous studies showed that Met deficiency in poultry reduced growth, feed intake (FI), body weight gain (BWG), egg size, production and increased feed conversion ratio (FCR) for layers and breeders ( 12 – 14 ). Additionally, low methionine diets decrease laying performance and egg quality ( 15 , 16 ). Moreover, a deficiency of Met in the diet of laying hens impairs the whole-body protein metabolism, significantly reducing protein synthesis ( 17 ).…”

Energia metabolizável do sorgo para codornas japonesas em postura

“…Se tratando de uma cultura de fácil manejo (Pastore et al, 2012) e rápido retorno financeiro (Silva et al, 2018), pequenos produtores tem buscado se incluir nesse mercado (Albino e Barreto, 2003). O sucesso na produção se dá pelo avanço no conhecimento em diversas frentes de pesquisa em métodos que avaliem a nutrição de codornas (Silva et al, 2012;Rostagno et al, 2017) e têm aumentado de forma considerável, nos diferentes ramos, seja na determinação das exigências em energia (Silva et al, 2004a;Moura et al, 2008;Vieira et al, 2020a), proteína bruta (Silva et al, 2004b;Vieira et al, 2020b), aminoácidos (Vieira et al, 2018;Mauricio et al, 2018), minerais (Bezerra et al, 2011;Vieira et al, 2012;Lima et al, 2015) e balanço eletrolítico (Rodrigues et al, 2015;Vieira et al, 2015) e também nas busca de alimentos alternativos para as dietas (Pereira et al, 2016;Valentin et al,2019).…”