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A total of 990 ring-necked pheasant hatching eggs were examined in relation to their shell colour –dark-brown, light-brown, olive, blue. Eggshell thickness, water vapour conductance and number of pores per 0,25 cm2 of eggshell were analysed in 285 eggs. Moreover, shell ultrastructure was examined of six eggs of each colour and three incubation sets were carried out with 681 eggs. Shells of blue eggs...
Forty ducks aged 7 weeks of strains A44 and P66 and conservative flocks P33 and K2 were investigated, 5 males and 5 females from each. Carcass composition was determined and microstructure of pectoralis maior muscle analysed. Males and females of strain A44 and those from flock K2 were characterized by a significantly greater breast muscles per cent of carcass compared to strain P66 and flock P33,...
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