title: Rare earth element-enriched yeast improved egg production and egg quality in laying hens in the late period of peak egg production.
abstract: The objective of this study was to determine the effects of rare earth element-enriched yeast (RY) on egg production, coefficient of total tract apparent digestibility (CTTAD), egg quality, excreta gas emission and excreta microbiota of laying hens. A total of 216 ISA brown laying hens of 52 weeks of age were used in a 5-week feeding trial and data were collected every week. Birds were randomly allotted to three dietary treatments each with six replicates and 12 hens per replicate. Each cage (38 cm width × 50 cm length × 40 cm height) contained one hen. Treatments consisted of corn-soya bean meal-based diet supplemented with 0, 500 or 1000 mg/kg of RY. From weeks 55 to 56, inclusion of RY linearly increased (p < 0.05) egg production. The CTTAD of nitrogen was increased (linear, p < 0.05) with increasing dietary level of RY. In week 55, yolk height and Haugh units were increased linearly (p < 0.05) with increasing dietary RY content. However, no significant effects were observed in terms of excreta emissions and excreta microbiota in laying hens. In conclusion, dietary supplementation with RY improved egg production and CTTAD of nitrogen and slightly improved egg quality in laying hens of the late period of peak egg production.
authors.affiliation: Department of Animal Resource & Science, Dankook University, Cheonan, Korea.
authors.forename: L
authors.initials: L
authors.lastname: Cai
authors.affiliation: Department of Animal Science, University of Manitoba, Winnipeg, MB, Canada.
authors.forename: C M
authors.initials: CM
authors.lastname: Nyachoti
authors.affiliation: Department of Animal Science & Industry, Kansas State University, Manhattan, KS, USA.
authors.forename: J D
authors.initials: JD
authors.lastname: Hancock
authors.affiliation: R&D Center for Natural Science, Biotopia Co., Ltd., Chuncheon, Korea.
authors.forename: J Y
authors.initials: JY
authors.lastname: Lee
authors.affiliation: R&D Center for Natural Science, Biotopia Co., Ltd., Chuncheon, Korea.
authors.forename: Y H
authors.initials: YH
authors.lastname: Kim
authors.affiliation: Biogenic Co., Ltd., Seoul, Korea.
authors.forename: D H
authors.initials: DH
authors.lastname: Lee
authors.affiliation: Department of Animal Resource & Science, Dankook University, Cheonan, Korea.
authors.forename: I H
authors.initials: IH
authors.lastname: Kim
mesh_terms: D000821:Animal Feed / Q000032:analysis; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002563:Cerium / Q000008:administration & dosage / Q000737:chemistry / Q000378:metabolism*; D002645:Chickens; D004032:Diet / Q000662:veterinary; D004063:Digestion / Q000187:drug effects; D004531:Eggs / Q000592:standards*; D005260:Female; D007811:Lanthanum / Q000008:administration & dosage / Q000737:chemistry / Q000378:metabolism*; D010058:Oviposition / Q000502:physiology*; D010843:Pichia / Q000737:chemistry* / Q000378:metabolism
chemical_list: D002563:Cerium; D007811:Lanthanum
keywords: egg production; egg quality; excreta gas emission; laying hen; rare earth element; yeast