<b>Glutamic acid supplementation on low protein diets for laying hens

Abstract

ABSTRACT. With the objective of evaluating the effect of reducing crude protein (CP) and L-glutamic acid supplementation, Dekalb Brown laying hens with 34 weeks of age. The birds were distributed in six treatments in a completely randomized design, eight replications of eight birds. The control diet contained 17% CP. The second and third treatments had CP reduced by 1.5 and 3.0 percentage points (pp) of CP in relation to the control diet, respectively. In the fourth treatment, was added the same amount of glutamate of the control diet (2.982%), and the last two treatments was added 1 and 2 pp of glutamate in relation to control diet (3.982 and 4.98%), respectively. The treatment with 15.17% CP + 0.341% L-glutamic acid (T4) promoted higher egg production, and the control diet showed greater egg weight than others treatments. There was no significant effect on the variables on quality of eggs. The T4 presented values of excreted nitrogen similar to the others treatments, with lower concentration of uric acid than the control diet and lower cost in the production. In conclusion, it is recommended the treatment with 15.17% CP + 0.341% L-glutamic acid for Brown laying hens with 34 weeks of age.Keywords: egg production, nitrogen, performance, uric acid.Ácido glutâmico suplementado em dietas de baixa proteína para poedeiras semipesadas RESUMO. Com o objetivo de avaliar o efeito da redução da proteína bruta (PB) e suplementação de L-glutamato em poedeiras da linhagem Dekalb Brown com 34 semanas de idade, as aves foram distribuídas em seis tratamentos em um delineamento experimental inteiramente casualizado com oito repetições. A dieta controle continha 17% PB. Os segundo e terceiro tratamentos tinham redução de 1,5 e 3,0 pontos percentuais (pp) de PB em relação à dieta controle, respectivamente. No quarto tratamento, foi adicionada a mesma quantidade de glutamato da dieta controle (2,982%), e nos dois últimos tratamentos foram adicionados 1 e 2 pp de glutamato em relação à dieta controle (3,982 e 4,98%), respectivamente. O tratamento com 15,17% CP + 0,341% L-glutâmico (T4) promoveu maior produção de ovos, e a ração controle apresentou maior peso de ovos do que os outros tratamentos. Não houve efeito significativo sobre as variáveis relativas à qualidade dos ovos. O T4 apresentou valores de nitrogênio excretado semelhante aos demais tratamentos, com menor concentração de ácido úrico que a dieta controle e menor custo na produção. Em conclusão, recomenda-se o tratamento com 15,17% PB + 0,341% de ácido L-glutâmico para poedeiras semipesadas com 34 semanas de idade.Palavras-chave: produção de ovos, nitrogênio, desempenho, ácido úrico.

Quality parameters, lipids and antioxidant profiles of eggs from hens fed diets with varied inclusions of monosodium glutamate

“…More researches to ascertain this claim will be necessary since there is very scanty information in the literature on the effect of monosodium glutamate supplementation in diets of commercial layers. The insignificant difference recorded in egg specific density, shell density and shell ratio among the hens across all treatments agreed with previous the finding (Bezerra et al, 2015). Eggs with thick and strong shells usually have a better appeal to consumers (Oke, 2014) and this is a characteristic mark of economic sell point.…”

“…Dietary protein goes a long way in influencing eggs. It is required to synthesize egg albumen, and a decrease in dietary protein may reduce the amount of albumen, leading to a smaller egg size (Bezerra et al, 2015). The reduction in egg weight and volume among the hens on diets containing 1.00 and 1.25 g MSG/kg in this experiment could be attributed to the effect of MSG in lowering the dietary protein of these diets.…”

Chelated Minerals and Limestone Particle Sizes on Performance and Bone Quality of Brown-Egg Layers

“…At the end of each 28-day period, four eggs were collected per replicate for the analysis of egg quality, in which the percentages of albumen, shell, yolk, and cracked eggs; shell thickness (mm); and specific gravity (g/cm3) were determined, following the methodology described by Bezerra et al (2015).…”

Characterization and Extraction Influence Protein Profiling of Edible Bird’s Nest

“…The presence of nEAA Glu in the body is very important, especially for transamination reactions in amino acid metabolism. It is involved in the synthesis of key molecules such as glutathione, which is important in the alleviation of oxidative stress and modulation of the immune response [35]. Asp plays a role as a regulator in hormone secretion and acts as a precursor for methionine (Met), threonine (Thr), isoleucine (Ile), and lysine (Lys).…”