DIGESTIBLE VALINE REQUIREMENTS IN LOW-PROTEIN DIETS FOR BROILERS CHICKS
ABSTRACT Three experiments were carried out to evaluate the levels of digestible valine in diets with reduced crude protein on the performance, carcass yield and muscle fiber diameter of male broilers during the pre-starter (1 to 8 d of age), starter (9 to 21 d of age) and grower phases (21 to 42 d of age). A total of 1,080 chickens in the pre-starter phase, 900 in the starter phase and 864 in the grower phase were distributed in a completely randomized design with six treatments, consisting of a control positive diet (C+) and diets with 2 percentage points (p.p.) reduction of crude protein level and five graded levels of digestible valine (Val), with six replicates of 30, 25 and 24 birds per experimental unit, respectively. The recommended level of TID Val in the low-protein diets for broilers in the pre-starter, starter and grower stages were 1.028; 0.905 and 0.789%, respectively. The reduction of 2 percentage points of the crude protein level in diets based on corn and soybean meal impaired (p ≤0.05) the feed conversion ratio in the starter and grower stages. Likewise, the reduced-protein diets decreased (p ≤0.05) muscle fiber diameter, but did not affect (p> 0.05) carcass and parts yields, or abdominal fat percentage at 42 days.
Main Authors: | Nascimento,GR, Murakami,AE, Ospina-Rojas,IC, Diaz-Vargas,M, Picoli,KP, Garcia,RG |
---|---|
Format: | Digital revista |
Language: | English |
Published: |
Fundacao de Apoio a Ciência e Tecnologia Avicolas
2016
|
Online Access: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2016000300381 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Similar Items
-
Digestible valine-to-lysine ratio in diets for broilerchickens
by: Potença, Alexandra, et al.
Published: (2015) -
Digestible valine requirements for broilers from 22 and 42 days old
by: Duarte,Karina Ferreira, et al.
Published: (2014) -
Valine in diets for Nile tilapia
by: Rodrigues,Rômulo Batista, et al.
Published: (2018) -
Response of broiler chicks to diets with bambaranut (Voandzeia subterranea) as a protein source
by: Nwaigwe,C.O., et al.
Published: (2010) -
Protease and sugarcane yeast in diets for broiler chicks
by: Moreira,Elvania Maria da Silva Costa, et al.
Published: (2020)