Qualidade de ovos de galinhas poedeiras alimentadas com dietas contendo minerais complexados a aminoácidos

Abstract

The objective of this study was to evaluate the effects of micronutrients (Zn), Manganese (Mn), Copper (Cu) and Iron (Fe) in the form of minerals complexed to amino acids (MCAA) associated with inorganic sources of feed for laying hens. The research was developed in the Ovo Novo farm, Caruaru, Pernambuco, and the laboratory analysis carried out in the Animal Science Department of the Federal Rural University of Pernambuco. A total of six hundred and forty Lohmann Brown-Lite llaying hens from 50 to 70 weeks of age were used, of which three hundred and twenty were fed MCAA from the breeding and rearing phase, and three hundred and twenty were not fed diets containing MCAA. The birds were housed in cages and distributed according to a completely randomized design in a 2 x 4 factorial scheme, consisting of 8 treatments with 8 replicates of 10 birds per experimental unit. The treatments consisted of 70, 70 and 8 mg / kg Zn, Mn and inorganic Cu (control) and 40, 40 and 2.75 mg / kg supplements associated with 30, 30 and 5.25 mg / kg Zn, inorganic and organic Mn, respectively (test), delivered from birth up to 30 weeks of age. They had been evaluated: weight of the egg (g), color of the egg yolk, height of albúmen (mm), weight of the eggshell (g), thickness of the eggshell (mm) and Haugh Unit. The data had been submitted to the analysis of variance by means of computational program R Studio® and the means subbmetted tukey test (P<0.05). But the thickness of eggshell was influenced by the treatments. It did not have interaction between the diet growth and the diet production, in this manner, the suplementation during the growing phases had not influenced to the parameters of internal quality of eggs in the production phase. However, it can be verified that the birds supplemented with sources MCAA had presented thickness of eggshell best. The partial substitution of the Zn, inorgânicos Mn, Cu and Fe for MCAA improves the thickness of the eggshell of eggs of the birds.