Graduate Thesis Or Dissertation
 

Nutritional and management factors affecting foot pad dermatitis in singlecomb White Leghorn dwarf and normal-sized layers

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  • Two studies were undertaken to evaluate the effects of nutrition and management factors on foot pad dermatitis in single-comb White Leghorn dwarf and normal-sized layers. In the nutrition study, caged layers were fed one of six different diets. These included three diets with different combinations of the trace minerals cobalt, copper, iodine, iron, manganese and zinc; one diet with a high level of linoleic acid from safflower oil; another diet with meat and bone meal; and a diet with fish meal as a source of possible unidentified factors. Diets were fed during the production period from age twenty-four weeks to sixty-four weeks. No significant (P > .05) decrease in the incidence of dermatitis was observed in dwarf or normal-sized layers with any of the diets. In the management study, the incidence of dermatitis in dwarf and normal-sized birds reared in cages was compared with dermatitis in birds reared in floor pens containing wood shavings as litter. In addition, the effects of plastic-coated cage floor inserts and wooden perches (inserted into cages) on the incidence of dermatitis was evaluated for both dwarf and normalsized layers. Birds reared in floor pens showed no incidence of foot pad dermatitis. Cage-reared normals had a non-significant but numerically higher incidence of dermatitis than did floor-reared normals. Cage-reared dwarfs developed a significantly (P <.05) higher incidence of dermatitis than did floor-reared dwarfs. Normals reared with either plastic-coated cage floor inserts or wooden perches showed no difference in the incidence of dermatitis from normals on control wire floors. Dwarfs reared with either plastic-coated floors or perches showed a significantly (P< .05) lower incidence of foot pad dermatitis than did dwarfs on control wire floors.
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