title: [The vitamin A supply of laying hens including during rearing. 2. Effect of varied vitamin A supplementation of mixed feed in rearing on production in the laying period].
abstract: In six experiments with laying hybrids the influence of a varied nutritive beta-carotene and vitamin A supply during rearing on the performance in the laying period was tested. Basal rations poor in carotene without vitamin A supplementation in the rearing period diminished feed intake and laying performance in the laying period, retarded the beginning of intensive laying and increased feed expenditure per 100 g egg if the feed for laying hens contained less than 5000 IU vitamin A per kg. Relations between varied vitamin A supply and the performance parameters of the laying performance could not be proved if chick and young hen feed with maize even without vitamin A supplement or if rearing feed with approximately 2500 IU vitamin A or laying hen feed greater than 5000 IU vitamin A supply were used.
authors.affiliation: Karl-Marx-Universität Leipzig.
authors.forename: G
authors.initials: G
authors.lastname: Richter
authors.forename: E
authors.initials: E
authors.lastname: Sitte
authors.forename: M
authors.initials: M
authors.lastname: Petzold
mesh_terms: D000704:Analysis of Variance; D000821:Animal Feed; D000818:Animals; D002338:Carotenoids / Q000008:administration & dosage; D002645:Chickens / Q000502:physiology*; D005260:Female; D005527:Food, Fortified; D010058:Oviposition / Q000502:physiology*; D014801:Vitamin A / Q000008:administration & dosage / Q000494:pharmacology*; D019207:beta Carotene
chemical_list: D019207:beta Carotene; D014801:Vitamin A; D002338:Carotenoids
vernacular_title: Untersuchungen zur Vitamin-A-Versorgung der Legehennen einschliesslich Aufzucht. 2. Mitteilung. Einfluss der variierten Vitamin-A-Supplementation des Mischfutters in der Aufzucht auf die Leistungen in der Legeperiode.