Resumo

VERA RODRIGUEZ M.SC., José Humberto  e  HIDALGO BRAVO M.SC., Gustavo Adolfo. Effect of different levels of calcium carbonate supply on the weight and thickness of the egg shell. rev. colombiana cienc. anim. Recia [online]. 2019, vol.11, n.2, pp.11-18.  Epub 05-Maio-2020. ISSN 2027-4297.  https://doi.org/10.24188/recia.v11.n2.2019.719.

The objective was to evaluate the effect of calcium carbonate supply levels 0.00; 0.50; 1.00; 1.50 g/bird/day, with a granulometry between 2 to 4 mm, when added in the late afternoon, about the weight of the egg and the thickness of the shell in laying hens from 22 to 30 weeks of age. 200 layers of the Hy-Line Brown genetic line were used, which were distributed in 4 treatments, 10 repetitions, during 9 weeks. The egg weight and shell thickness were evaluated weekly, using a completely randomized block design. The results did not show differences in the weight of the egg, while for the thickness of the shell significant statistical differences were found p <0.05. In conclusion, it was demonstrated that the addition of 1.50 g/ bird / day of calcium carbonate in the late afternoon with a granulometry of 2 to 4 mm, improved the thickness of the eggshell during the weeks of evaluation, It is also stated that the egg shell thickness can be estimated through the weight of the egg by performing the following regression model (Shell thickness = 0.3533 x ln (Egg weight) - 1.001).

Palavras-chave : Poultry farming; calcium carbonate; shell thickness; layers; egg production.

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