Now showing items 1-10 of 1954
Mortality, production and quality of eggs of different rearing systems
The conventional production of eggs in cage systems is intense and compromises the laying hens welfare. More demanding consumer markets have been pushing to abolish the use of cages and thus provide better welfare in poultry ...
Estimates of genetic parameters, and cluster and principal components analyses of breeding values related to egg production traits in a White Leghorn population
(Poultry Science Assoc Inc, 2011-10-01)
The objectives of this paper were to identify the phenotypic egg-laying patterns in a White Leghorn line mainly selected for egg production, to estimate genetic parameters of traits related to egg production and to evaluate ...
Performance and egg quality of Japanese quails submitted to cyclic heat stress
(Fundação APINCO de Ciência e Tecnologia Avícolas, 2012-03-01)
Aiming at evaluating the influence of cyclic temperatures on the performance and egg quality of Japanese quails an experiment was carried out with 480 birds after egg production peak. Birds were housed in a bioclimatic ...
Modelling the egg components and laying patterns of broiler breeder hens
There is scant information about the reproductive process in broiler breeders, with which to develop a feeding strategy that will be economically optimal for these birds. This study aimed to model the egg production of a ...
Effect of the Inclusion of Organic Copper, Manganese, And Zinc in The Diet of Layers on Mineral Excretion, Egg Production, and Eggshell Quality
(Facta-fundacio Arnco Ciencia Tecnologia Avicolas, 2015-10-01)
This study aimed at evaluating the replacement of inorganic copper, manganese, and zinc sources by organic sources in the diet of laying hens during the second laying cycle in trace mineral excretion, egg production, and ...
Comparison of National and International Standards of Good Egg Production Practices
(Facta-fundacio Arnco Ciencia Tecnologia Avicolas, 2016-12-01)
Egg production is an important economic activity in Brazil, with about 697 million eggs produced annually. The conventional cage system is commonly used for egg production. However, there has been a growing concern for the ...
Performance and egg quality of four quail genetic groups
(Amer Dairy Science Assoc-adsa, 2007-01-01)
Comparison of logistic and neural network models to fit to the egg production curve of White Leghorn hens
(Poultry Science Assoc Inc, 2011-03-01)
Neural networks are capable of modeling any complex function and can be used in the poultry and animal production areas. The aim of this study was to investigate the possibility of using neural networks on an egg production ...
Rhodocyclus gelatinosus biomass for egg yolk pigmentation
(Poultry Science Assoc Inc, 2004-09-01)
Biomass of the photosynthetic bacterium Rhodocyclus gelatinosus was used at different levels in laying hens' rations as a xanthophyll source. Sixty-four hens were used in the experiment that investigated the effects of ...
Prediction equations to estimate the demand of energy and crude protein for maintenance, gain and egg production for laying Japanese quails
(Sociedade Brasileira de Zootecnia, 2011-11-01)
The study was conducted to estimate requirements of energy and crude protein for maintenance, weight gain and egg production of Japanese quails in the period of 67 to 107 days of age. Two experiments were performed: one, ...