Qualitative and quantitative characterization of waste layers fed diets containing mineral sources and rosemary oil levels
Abstract
This study aimed to evaluate the effects of mineral sources and rosemary oil levels in the
diet of commercial layers on the qualitative and quantitative characteristics of the waste generated.
Manure was obtained from 288 commercial laying hens of the HyLine Brown lineage (semi-heavy layers)
at 30 weeks of age over a period of 112 d (four cycles of 28 d). A completely randomized design was
used with a 2×3 factorial scheme with repeated measures over time (16 repetitions), with two mineral
sources (inorganic and organic) and three levels of rosemary oil (0, 100, and 200 mg kg-1). The waste
was collected weekly, weighed, and the calculations of waste production, residue coefficient (RC) were
performed. Also analyses of total solids (TS), volatile solids (VS), pH, macro-, and micro-minerals were
performed. Mineral sources affect the quality characteristics of the manure. The amount of rosemary
oil affected the quantitative and qualitative characteristics of the waste generated. It was concluded
that diets containing organic minerals resulted in waste with less polluting power, as it had a lower TS,
pH, total N, and total P values. Rosemary oil increased manure production in natural matter (NM) and
increased the TS and VS values in the manure layer, causing a greater environmental impact.
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