Influence of Small and Round Egg Types on Three-Purpose Incubation.

Influence of White Leghorns, semi-rustic (Turquino), and heavy breeds, in terms of unsuitable egg for incubation due to low weight or incubation manner, and the chicks weight on the first. The design was completely designed at random, with three treatments (White Leghorn, semi-rustic Turquino and heavy breeds). Three types of eggs were incubated (small, ordinary oval, and normal round eggs), classified according to their weight and shape, following eight incubations of 16 478 eggs. All of them were checked at 21 days and the new chicks were weighed. SPSS 18.0 for Windows was used for simple variance analysis, and Tukey´s multiple comparison of means was utilized. On the first day the chicks´ weight had a significant difference (P ≤0.05) among breeders. The highest heavy weights (oval ordinary and normal round eggs) and small oval eggs in the White Leghorns are below the requirements for industri-al exploitation in Cuba. Hatchability was within the set up limits for each purpose in the areas studied. The results for 1 000 eggs of every type in White Leghorn breed accounted for 4.65 (ordinary round); 4.28 (small oval) and 4.55 (ordinary oval eggs weekly), very closely related. These results proved that unsuitable eggs for incubation are being used