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

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. T...

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Bibliographic Details
Published in:British poultry science 2001-03, Vol.42 (1), p.77-80
Main Authors: Inal, F., CoŞkun, B., GülŞen, N., KurtoĞlu, V.
Format: Article
Language:English
Subjects:
Animal Feed
Animal Nutritional Physiological Phenomena
Animals
Case-Control Studies
Chickens - metabolism
Chickens - physiology
Diet
Dietary Supplements
Eggs - analysis
Female
Minerals - administration & dosage
Minerals - analysis
Nutritional Requirements
Oviposition - drug effects
Vitamins - administration & dosage
Vitamins - analysis
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Summary: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
ISSN:0007-1668
1466-1799
DOI:10.1080/713655024