Laying Performance of Pearl Gray Guinea Fowl Hens as Affected by Caging Density

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Growth characteristics of pearl gray guinea fowl as predicted by the Richards, Gompertz, and logistic models.

This study was undertaken to describe the growth pattern of the pearl gray Guinea fowl. Using BW data from hatch to 22 wk, 3 nonlinear mathematical functions (Richards, Gompertz, and logistic) were used to estimate growth patterns of the pearl gray guinea fowl. The logistic and Gompertz models are a special case of the Richards model, which has a variable point of inflection defined by the shap...

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Ammonia Emissions of Pullets and Laying Hens as Affected by Stocking Density and Manure Accumulation Time

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Ammonia Emissions of Laying Hens as Affected by Stocking Density and Manure Accumulation Time

Different stocking densities (SDs) or space allocations are being practiced in commercial laying-hen operations as an attempt to improve hen welfare. Information concerning the impact of SD on accumulated manure properties (e.g., moisture content) and thus ammonia (NH3) emissions is limited in the literature. Bird SD affects the amount of manure per unit of accumulated manure surface area, whic...

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ژورنال

عنوان ژورنال: Poultry Science

سال: 2006

ISSN: 0032-5791

DOI: 10.1093/ps/85.9.1682