title: [Effect of the manganese content in laying hen feed with different Ca and mineral levels on the egg shell quality and bone mineralization of hens].
abstract: Four experiments with 270, 44, 432 and 66800 Leghorn hens were carried out to investigate the influence of various Mn additions to diets differed in mineral or Ca contents on egg shell quality. The addition of 300 mg Mn/kg diet improved significantly egg shell breaking strength by 4 N over one year. The supply of 50-500 mg Mn/kg diet for 10-24 weeks of the second half of laying year did not influence the egg shell quality. Addition of mineral mixture or Ca grit to layer rations with adequate or higher Mn levels did not influence egg shell strength. High mineral content in a low manganese diet increased number of cracks by 3%. Strength, weight and ash content of tibia were significantly reduced by feeding a low mineral level. Addition of 50-150 mg Mn per kg low mineral diet normalized partially tibia stability in young hens. It was concluded that supplied dietary Manganese influences calcification positively only in young hens. High levels of Ca did not influence the effects of Mn. 50 mg Mn per kg layers mixture have been considered as an essential supply.
authors.affiliation: Universität Leipzig, Fakultät für Agrarwissenschaften, Wissenschaftsbereich Tierernährungschemie, Jena.
authors.forename: C
authors.initials: C
authors.lastname: Ochrimenko
authors.forename: A
authors.initials: A
authors.lastname: Lemser
authors.forename: G
authors.initials: G
authors.lastname: Richter
authors.forename: U
authors.initials: U
authors.lastname: Krause
authors.forename: H
authors.initials: H
authors.lastname: Bonsak
mesh_terms: D000821:Animal Feed; D000818:Animals; D015519:Bone Density; D002136:Calcium, Dietary / Q000008:administration & dosage; D002645:Chickens / Q000378:metabolism*; D004528:Egg Shell / Q000737:chemistry*; D005260:Female; D008345:Manganese / Q000008:administration & dosage*; D008903:Minerals / Q000008:administration & dosage
chemical_list: D002136:Calcium, Dietary; D008903:Minerals; D008345:Manganese
vernacular_title: Einfluss des Mangangehaltes im Legehennenfutter bei unterschiedlichem Ca- und Mineralstoffangebot auf die Eischalenqualität und Knochenmineralisierung der Hennen.