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Revista Brasileira de Zootecnia

Print version ISSN 1516-3598

Abstract

FARIA, Douglas Emygdio de; JUNQUEIRA, Otto Mack; SAKOMURA, Nilva Kazue  and  SANTANA, Aureo Evangelista. Effect of different levels of manganese and phosphorus on the performance and eggshell quality of laying hens. R. Bras. Zootec. [online]. 1999, vol.28, n.1, pp.105-112. ISSN 1516-3598.  http://dx.doi.org/10.1590/S1516-35981999000100015.

The objective of this experiment was to evaluate the different levels of manganese and phosphorus (P) on the performance and eggshell quality and on determined blood constituents of 96 laying hens Hy-Line W36, with 60 weeks of age, distributed in 24 lots with four hens each. A completely randomized experimental design was used in a factorial arrangement (3 x 2), manganese levels (70, 140 and 210 ppm) and total phosphorus levels (.35 and .55%), totalizing six treatments with four replicates each. The experimental diets were isoproteic (16.0% CP), isocaloric (2800 kcal ME/kg), isocalcium (4.0% Ca) and isosodium (.16% Na). The manganese levels did not alter the production and eggshell quality. However, when hens were fed diets containing .35% of total P, there were observed decreases in the egg production, egg weight and egg mass, without alterations in eggshell quality characteristics. The supplemental manganese levels were not effective to improve eggshell quality at the final phase of production. The total phosphorus level of .35% was inadequate for the laying hens to express the normal production characteristics

Keywords : phosphorus; manganese; nutrition; laying hens; eggshell quality.

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