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Vliv technologie chovu na produkci vajec plymutky žluté (Plymouth Rock)
 JANDOVÁ, Lucie
The aim of the thesis was to compare the effects of housing technology on the laying of hens in the floor and free-range system in the backyard. Medium heavy chicken breed Plymouth Rock (colour variation Buff) in two groups of 20 animals were used to monitor laying. The results were evaluated for five months laying period. Higher number of eggs and heavier eggs were obtained from the group kept in free-range system. From hens in the floor system were obtained 673 pieces of eggs for the entire period of laying and 800 pieces of eggs from the free-range group, which represents the average number of 5.98 pieces laid per month, respectively 7.75 pieces at P 0.001. The intensity of laying increased even at temperatures below 0 °C but less in floor system. Average weight of eggs per the laying cycles was higher in the free-range 54.6 g compared with 52.59 g in the system of limited movement of the hens. Egg mass production for the entire observed laying period was also higher in the free-range 43.68 kg, within floor system only 35.39 kg.
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