The effects of withdrawal of vitamin and trace mineral supplements from layer diets on egg yield and trace mineral composition

British Poultry Science
F InalV Kurtoğlu

Abstract

1. This study was conducted as three trials. 2. In the first trial, zinc, manganese, copper and iron concentrations were determined in dietary raw materials collected from various regions of Turkey. 3. In the second trial, 200 Hisex Brown laying hens, 30 weeks of age, were divided into two groups. The first group served as controls and were fed on a standard commercial layer diet. The second group were fed on a commercial layer diet that was not supplemented with trace minerals and vitamins. Egg production, egg weight, specific gravity, food consumption and food efficiency of the birds in each group were determined. In the unsupplemented group, egg production (0.75 vs 0.83) and food intake (114 vs 122 g) were lower than the those of the control group (P < 0.05). Food efficiency was 2.42 (kg food/kg gain) in the group consuming the unsupplemented diet and 2.36 in the controls. 4. In the third trial, as in Trial 2, Hisex Brown laying hens, 62 weeks of age were used. In the unsupplemented group, the mean egg weight was significantly lower than that of controls (68.0 vs 69.6 g) (P < 0.01). 5. At the end of the second and third trials, egg samples collected from experimental groups were hard boiled in water. The levels of zinc, mang...Continue Reading

References

Feb 1, 1990·Journal of Pediatric Gastroenterology and Nutrition·I E Haffejee

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Citations

Nov 23, 2012·Animal : an International Journal of Animal Bioscience·C L BailieN E O'Connell
Apr 20, 2005·British Poultry Science·R E NewmanJ A Downing
Oct 28, 2011·British Poultry Science·T AksuM Karaoglu
Jun 15, 2012·Animal Science Journal = Nihon Chikusan Gakkaihō·Xiaojun YangYajing Sun
Jul 4, 2015·Journal of Food Science and Technology·Anna Winiarska-Mieczan, Małgorzata Kwiecień

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