Experimental rickets in broilers: gross, microscopic, and radiographic lesions. I. Phosphorus deficiency and calcium excess [Chicks, diets]
Day-old broiler chicks were fed diets high in calcium or low in phosphorus for 30 days. Chicks in both groups had similar gross, microscopic, and radiographic lesions. At 2 weeks, the growth-plate degenerating hypertrophied zone (DHZ) and metaphyseal primary spongiosa were lengthened and decreased i...
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Veröffentlicht in: | Avian diseases 1984-04, Vol.28 (2), p.460-474 |
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Sprache: | eng |
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Zusammenfassung: | Day-old broiler chicks were fed diets high in calcium or low in phosphorus for 30 days. Chicks in both groups had similar gross, microscopic, and radiographic lesions. At 2 weeks, the growth-plate degenerating hypertrophied zone (DHZ) and metaphyseal primary spongiosa were lengthened and decreased in radiopacity. Metaphyseal vessels extended to the growth-plate hypertrophied zone (HZ), and osteoid seams were widened. At 3 and 4 weeks, lesions were similar; however, folding fractures were common and cartilage columns of the metaphysis were thinned and replaced with increased woven bone. /// Pollitos de engorde de un día de edad fueron alimentados con dietas de alto contenido de calcio y bajo contenido de fósforo. Los pollitos del grupo alimentado con dieta deficiente en fósforo (P-0.2) y del grupo con exceso de calcio (Ca-2.2) tuvieron lesiones macroscópicas, microscópicas y radiográficas similares. A las dos semanas de edad, la zona del cartílago hipertrófico de la línea epifisiaria y la espongiosa primaria de la metáfisis se encontraban alargadas y con mayor radiotransparencia a los rayos X. Los vasos sanguíneos de la metáfisis invadían la zona del cartílago hipertrófico. A las 3 y 4 semanas las lesiones fueron similares; sin embargo, las columnas de cartílago de la metáfisis se encontraban más delgadas y fueron reemplazadas por hueso inmaduro. Las fracturas fueron comunes y las fisuras osteoides estaban ensanchadas. |
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ISSN: | 0005-2086 1938-4351 |
DOI: | 10.2307/1590353 |