Correlations between thermal environment and egg quality of two layer commercial strains

Autor: S. K. Kakimoto, NM Soares, Sandra Cristina de Oliveira, Cristina Kimie Togashi, G. Vitorasso, Danilo Florentino Pereira
Přispěvatelé: Universidade Estadual Paulista (Unesp), Agência Paulista de Tecnologia dos Agronegócios (APTA)
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Zdroj: ResearcherID
Revista Brasileira de Ciência Avícola, Volume: 10, Issue: 2, Pages: 81-88, Published: JUN 2008
Brazilian Journal of Poultry Science, Vol 10, Iss 2, Pp 81-88 (2008)
SciELO
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
Brazilian Journal of Poultry Science v.10 n.2 2008
Brazilian Journal of Poultry Science
Fundação APINCO de Ciência e Tecnologia Avícolas (FACTA)
instacron:FACTA
ISSN: 1516-635X
Popis: Submitted by Guilherme Lemeszenski (guilherme@nead.unesp.br) on 2013-08-22T18:40:14Z No. of bitstreams: 1 S1516-635X2008000200002.pdf: 728244 bytes, checksum: b947348bdf50b40428a7bbdc1574915b (MD5) Made available in DSpace on 2013-08-22T18:40:14Z (GMT). No. of bitstreams: 1 S1516-635X2008000200002.pdf: 728244 bytes, checksum: b947348bdf50b40428a7bbdc1574915b (MD5) Previous issue date: 2008-06-01 Made available in DSpace on 2013-09-30T19:25:30Z (GMT). No. of bitstreams: 2 S1516-635X2008000200002.pdf: 728244 bytes, checksum: b947348bdf50b40428a7bbdc1574915b (MD5) S1516-635X2008000200002.pdf.txt: 32997 bytes, checksum: 74ed6b6ed8699e650cd0558da9cd277e (MD5) Previous issue date: 2008-06-01 Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-20T13:12:14Z No. of bitstreams: 2 S1516-635X2008000200002.pdf: 728244 bytes, checksum: b947348bdf50b40428a7bbdc1574915b (MD5) S1516-635X2008000200002.pdf.txt: 32997 bytes, checksum: 74ed6b6ed8699e650cd0558da9cd277e (MD5) Made available in DSpace on 2014-05-20T13:12:14Z (GMT). No. of bitstreams: 2 S1516-635X2008000200002.pdf: 728244 bytes, checksum: b947348bdf50b40428a7bbdc1574915b (MD5) S1516-635X2008000200002.pdf.txt: 32997 bytes, checksum: 74ed6b6ed8699e650cd0558da9cd277e (MD5) Previous issue date: 2008-06-01 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Heat stress limits the productivity of laying hens, as reflected by egg production and egg quality. The present study aimed at showing the correlations between egg quality parameters and environmental variables recorded on the day eggs were laid and on the previous days. Birds were housed in battery cages in a commercial poultry house. Main component analyses were used to verify associations between environmental and production variables, and Pearson's linear correlation tests were used to further investigate those associations. Analyses were carried out separately for to layer strains, Dekalb® White and Hy-Line® w36, and the variables egg weight (g), eggshell weight (g), specific gravity (g/cm³) and eggshell percentage (%) were compared with the environmental variables of the same day of the production, and one, two, three, and four days before egg production. Sound intensity measured inside the houses was positively associated with the quality parameters of eggs produced on the next day. Thermal environmental variables affected the egg quality differently in each strain, particularly air temperature, internal roof tile temperature, relative humidity, and air velocity. Ammonia concentration measured inside the houses was lower than 1ppm, and did not affect production performance. UNESP Faculdade de Administração de Empresas e Agronegócios APTA Alta Paulista APTA IB CAPTAA UNESP Faculdade de Administração de Empresas e Agronegócios FAPESP: 06/51926-7 CNPq: 476397/20 FAPESP: 08/09582-4
Databáze: OpenAIRE
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