The effects of a higher amount of iodine supplement on the efficiency of laying hens fed extruded rapeseed and on eggshell quality

M. Lichovniková and L. Zeman
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M. Lichovniková: , L. Z 2 1Department of Poultry Breeding, 2Department of Animal Nutrition, Mendel University of Agriculture and Forestry, Brno, Czech Republic
L. Zeman: , L. Z 2 1Department of Poultry Breeding, 2Department of Animal Nutrition, Mendel University of Agriculture and Forestry, Brno, Czech Republic

Czech Journal of Animal Science, 2004, vol. 49, issue 5, 199-203

Abstract: The objective of this experiment was to study the effects of feeding 6.07 mg/kg of iodine in comparison with 3.57 mg/kg of iodine as a supplement in diets with different levels of extruded rapeseed (4.5, 9.0 and 13.5%) for a period of 52 weeks. The higher amount of iodine had the most marked effect on the egg mass production and on the feed : egg mass ratio when the hens were fed 9.0% extruded rapeseed in the diet. The egg mass production increased from 55.5 ± 1.06 g/d to 57.8 ± 1.12 g/d and the feed : egg mass ratio was improved from 2.15 kg/kg to 2.02 kg/kg. The eggshell weight ratio significantly (P < 0.05) increased in all groups with the higher level of iodine. The higher level of iodine significantly (P < 0.05) increased eggshell thickness in the groups with 9.0 and 13.5% of extruded rapeseed and it also significantly (P < 0.01) increased eggshell strength in the groups with 4.5 and 9.0% of rapeseed in the diets.

Keywords: egg mass; feed: egg mass ratio; eggshell weight ratio; eggshell thickness; eggshell strength; goitrogens (search for similar items in EconPapers)
Date: 2004
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Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlcjs:v:49:y:2004:i:5:id:4300-cjas

DOI: 10.17221/4300-CJAS

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