The study was carried out to investigate the effects of Camelina and hempseed cakes in the diets of ducks on the intramuscular fatty acid profile. Our study showed that supplementing Camelina cake in duck diets makes it possible to develop functional food, i.e. meat with a significantly higher content of ALA, total n-3 PUFA and the lowest ratios of n-6 / n-3 fatty acids in muscles. Duck diet with hempseed cake produces exceptional quality meat with an enriched content of n-6 GLA.

This study was conducted to determine inner egg quality characteristics using external egg quality characteristics and to select variables in order to obtain the simplest model using ridge, LASSO and elastic net. The goodness of fit values of the regression estimating equations for egg yolk weight were 58.34 %, 59.17 % and 59.11 % using the ridge, LASSO and elastic net methods, respectively; for egg albumen weight they were 75.60 % for ridge, 75.94 % for LASSO and 75.81 % for elastic net.

It has been stressed that increasing the growth velocity and muscle mass in chickens possibly resulted in trade-offs regarding product quality. Therefore, this research aimed at comparing the breast meat quality of chickens with divergent growth rates. The results suggest that selection on high growth rates could be associated with increased pH when the body weight of fast-growing birds reaches about 40 to 60 % of their growth potential and, possibly, also with increased cooking loss.