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Mortality, production and quality of eggs of different rearing systems
(2018-07-01)
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 ...
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 ...
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
(2016-01-01)
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 ...
Dietary combination of chelated zinc and threonine and effects on egg production, egg quality and nutrient balance of Brown laying hens from 20 to 49 weeks of age
(2020-09-01)
Studies have evaluated the effects of zinc (Zn) supplementation as an important dietary factor that regulates intestinal amino acid metabolism, protecting and preventing diarrhea. Threonine (Thr) also plays an important ...
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 ...
Effect of organic selenium and zinc on the performance and egg quality of Japanese quails
(Fundação APINCO de Ciência e Tecnologia Avícolas, 2011-06-01)
The present study aimed at evaluating the effect of the dietary inclusion of organic trace minerals selenium and zinc on the performance and internal and external egg quality of Japanese quails submitted to heat stress. ...
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 ...