Effect of genetic strain, cage space and dietetic tryptophan level on the laying hens performance

Otávio Antonio Rech, João Waine Pinheiro, Nilva Aparecida Nicolao Fonseca, Caio Abércio da Silva, Alexandre Oba

Abstract


The aim of this study was to evaluate the effect of lineage, battery cage space allowance and tryptophan level in diet on commercial laying hens performance. A total of 720 hens from two different lineages and 31-47 weeks of age were used in a 2x3x4 factorial experimental design (lineages A and B; space allowances of 563, 450 and 375 cm2/animal and tryptophan levels of 0,175%; 0,195%; 0,392% e 0,591%), with twenty-four treatments and three replications each. The different space allowances were obtained according with the number of laying hens in the cage. The results showed effects of lineage on egg production, egg weight and animal mortality. When space allowance was reduced from 563 to 375 cm2/laying hen, the feed intake and egg weight decreased and animal mortality increased independent of hens’ lineage. In conclusion, the diets containing different levels of tryptophan were not efficient to control negative effects of overcrowding on laying hens performance.


Keywords


Amino acid; Density; Egg production; Mortality; Stress



DOI: http://dx.doi.org/10.5433/1679-0359.2010v31n4p1051

Semina: Ciênc. Agrár.
Londrina - PR
E-ISSN 1679-0359
DOI: 10.5433 / 1679-0359
E-mail:  semina.agrarias@uel.br
Este obra está licenciado com uma Licença  Creative Commons Atribuição-NãoComercial 4.0 Internacional