Abstract
The research was performed on 156 laying hens, Rosso – SL hybrid. They were divided in two groups, 78 heads each. The experimental group 2 received 0.1% mineral supplement Eggshell – 49 in combined forage. The experimental period was of 23 weeks, and represented the last two laying phases (49 – 69 weeks of age). During the experimental period, the following parameters were recorded: the laying intensity, average weight of eggs, forage consumption by egg, egg structure and shell quality. The use of the mineral supplement Eggshell – 49 in laying hens feeding after 46 weeks of age led to the increase of the laying intensity by 7.46%, increase of the average weight of eggs by 1.41%, reducing of the forage consumption by egg with 6.95%. The administration of the mineral supplement Eggshell – 49 in group 2 led to eggs with higher quality shell compared to those obtained from group 1 (control). The egg shell recorded n increase of + 0.69 g, and shell thickness of + 0.05mm. A lower number of eggs with shell abnormalities were recorded in group 2. The results obtained in this trial confirm the favorable effects of the mineral supplement Eggshell – 49 on the main production indices and quality of egg shells.
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