Data/hora: 17/06/2024 04:02:21

Provedor de dados: 	Revista Brasileira de Zootecnia	
País: 	Brazil	
Título: 	Water vapor conductance: a technique using eggshell fragments and relations with other parameters of eggshell	
Autores: 	Araújo,Itallo Conrado Sousa de; Leandro,Nadja Susana Mogyca; Mesquita,Mariana Alves; Café,Marcos Barcellos; Mello,Heloisa Helena Carvalho; Gonzales,Elisabeth.	
Data: 	2017-12-01	
Ano: 	2017	
Palavras-chave: 	Fertile eggs; Porosity; Shell conductance; Shell thickness.	
Resumo: 	ABSTRACT The objective of this study was to evaluate a technique for quantifying eggshell conductance using shell fragments from hatched eggs. Additional objectives were to calculate the correlation between eggshell conductance, porosity, and thickness and correlate these parameters with incubation data. The study design was fully randomized in a 3 × 3 factorial scheme (three egg regions - large end, equator, and narrow end - and three ages of broiler breeders – 29, 35, and 59 weeks). A total of 216 eggs were used, with 24 repetitions for each treatment. Neither conductance nor shell thickness showed any interaction with egg region. Breeder age influenced eggshell conductance, such that it was greatest in eggshells from 59-week breeders (0.323 mg day−1 torr−1), while for 29-week and 35-week breeders, the conductance values found were 0.285 and 0.270 mg day−1 torr−1, respectively. The eggshell thickness was similar in eggs from 29 and 35-week breeders and these were greater than the thickness of eggshells from 59-week breeders. Correlations between mean eggshell conductance and chick body weight and yolk free chick body weight were found significant. There were no correlations between mean eggshell thickness and any of the data evaluated. There were positive correlations between mean eggshell porosity and egg weight loss up to the time of transfer, chick weight, and yolk free body weight. The technique of using eggshell fragments can be used for measuring eggshell conductance. Eggshell porosity is the characteristic that best correlates with incubation parameters.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017001200896	
Editor: 	Sociedade Brasileira de Zootecnia	
Relação: 	10.1590/s1806-92902017001200004	
Formato: 	text/html	
Fonte: 	Revista Brasileira de Zootecnia  v.46 n.12 2017	
Fonte: 	info:eu-repo/semantics/openAccess