Avaliação de níveis de glicina+serina em dietas de frangos de corte com reduzido teor de proteína bruta

Abstract

RESUMOO experimento foi conduzido em delineamento inteiramente ao acaso para avaliar os efeitos de diferentes níveis de glicina+serina (gli+ser) total em dietas de baixa proteína bruta (PB) Atualmente existe grande pressão, não apenas para reduzir os custos de produção, mas também para reduzir desperdícios e eliminação de elementos poluentes, dentre os quais está o nitrogênio.

Supplementation of L‐glycine and L‐glutamate to Japanese quails from 01 to 36 days of age using the ideal protein concept

“…By analyzing the performance of quails fed diets T 1‐1 versus T 1‐2 , it was observed that the protein reduction and the supplementation of limiting essential amino acids (T 1‐2 ) did not significantly alter the feed intake of quails in relation to the control diet (T 1‐1 ), in which there was no reduction of crude protein. These data corroborate with Applegate et al (), Darsi et al (), Hernandez et al (), Vasconcellos et al () and Vasconcellos et al (), who did not verify a reduction in feed intake in broilers and/or laying hens by reducing the dietary crude protein level and supplementing with only the limiting amino acids.…”

“…Darsi et al (), Hernandez et al (), Vasconcellos et al () and Vasconcellos et al () did not observe a difference for the variables mentioned above in broilers fed a control diet in relation to a diet with protein reduction and supplemented only with limiting essential amino acids.…”

“…Darsi et al (2012),Hernandez et al (2012), Vasconcellos et al (2011) and Vasconcellos et al (2015 did not observe a difference for the variables mentioned above in broilers fed a control diet in relation to a diet with protein reduction and supplemented only with limiting essential amino acids.Quails fed diets with supplementation of limiting essential amino acids L-glycine (T 1-3 ) and L-glutamate (T 1-4 ) had reduced final weight (2.74 and 3.03 g/bird respectively) and a reduced weight gain (0.19…”

“…Several research studies try to elucidate the cause of the impaired performance in broilers fed diets with reduced protein levels. The hypotheses include: decreases in digestible glycine levels (Namroud et al, 2010;Vasconcellos et al, 2015Vasconcellos et al, , 2011Yuan et al, 2012); decreases in digestible lysine levels (Saima, Jabbar, Mehmud, Abbas, & Mahmood, 2010); decreases in digestible glycine/threonine ratio (Waldroup, Jiang, & Fritts, 2005b); changes in electrolyte balance (Han, Suzuki, Parsons, & Baker, 1992;Vieira et al, 2015); decreases in the ratio between essential and non-essential amino acids (Waldroup et al, 2005a); reductions in dietary nitrogen levels (Bregendahl, Sell, & Zimmerman, 2002); reductions in feed intake (Namroud et al, 2010); changes in serum levels of triiodothyronine, thyroxine and ammonia (Carew, Evarts, & Alster, 1998;Namroud et al, 2008Namroud et al, , 2010; changes in the concentration of intestinal transporters, as well as in the absorption efficiency (Corzo, Loar, Kidd, & Burgess, 2011;Nyachoti, Omogbenigun, Rademacher, & Blank, 2006;Tuitoek, Young, de Lange, & Kerr, 1997;Wu et al, 2015) and increases in fat content in the carcass (Yamazaki, Murakami, & Takemasa, 1998), which reduces muscle tissue deposition.…”