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The use of high zinc diets as forced molting method effect on zinc uptake and egg zinc content


, : The use of high zinc diets as forced molting method effect on zinc uptake and egg zinc content. Archiv fuer Gefluegelkunde 52(6): 245-251

White Leghorns and Brown Layers were fed diets containing respectively 10,000, 20,000 or 30,000 ppm ZnO for 1, 2 or 3 weeks to induce molting. Zinc analyses were performed in egg shell, yolk and albumen of eggs collected daily from the start of the treatment until cessation of egg laying and of eggs collected resuming egg laying for the second production year. Individual body weights were obtained weekly and feed intake per battery cage (2 or 3 hens/cage) was measured daily. No differences in body weight changes between levels of zinc were found within strain. The 3 weeks of zinc treatment was the most severe molting method. Zinc uptake was lower in BL than in the WL strain because feed intake decreased more in the former one, this decrease being zinc-dose dependent. Levels of zinc in albumen or egg shell were not influenced by treatment or strain. Zinc levels in the yolk of eggs however were increased after the 2nd or 3rd day of treatment and were related to the amount of total zinc uptake. But the amount of zinc stored in this way dependend more on the level of feed intake than on zinc treatment itself and further on the time-lay before egg laying was stopped. Both parameters were strain dependent. In all cases, no increase in zinc content was found in eggs laid after resuming egg production, whatever the dose or duration of zinc treatment.

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