Revista Brasileira de Ciência Avícola
On-line version ISSN 1806-9061
PELICIA, K et al. Alternative calcium source effects on commercial egg production and quality. Rev. Bras. Cienc. Avic. [online]. 2007, vol.9, n.2, pp. 105-109. ISSN 1806-9061. http://dx.doi.org/10.1590/S1516-635X2007000200005.
This study aimed at verifying the possibility of replacing calcitic limestone by marine calcium in the diet of layers. A total number of 321 Hi-sex hens, with 40 weeks of age at the beginning of the experiment, was used. A completely randomized experimental design was applied, with 5 treatments (0, 15, 30, 45, and 60 % of calcitic limestone replacement by marine calcium source) and eight replicates of eight birds each. Treatments significantly affected specific gravity (p<0.05), with the inclusion of 60% marine calcium (T5) presenting the worst result as compared to T1, which included only calcitic limestone as calcium source. It was concluded that marine calcium can replace up to 45% of calcitic limestone with no effects on performance or egg quality.
Keywords : Alternative calcium source; eggshell quality; limestone replacement; marine algae; marine calcium.