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Título: | Combinations of cholecalciferol and 25-hydroxycholecalciferol as vitamin D sources in white laying hen feed diets |
Título(s) alternativo(s): | Combinações de colecalciferol e 25-hidroxicolecalciferol como fontes de vitamina D em dietas para galinhas poedeiras leves |
Palavras-chave: | Vitamin sources Productive performance Eggshell quality Bone characteristics Fontes de vitamina Desempenho produtivo Ovos - Qualidade da casca Caraterísticas ósseas |
Data do documento: | Nov-2014 |
Editor: | Universidade Federal de Lavras |
Citação: | RIVERA, D. F. R. et al. Combinations of cholecalciferol and 25-hydroxycholecalciferol as vitamin D sources in white laying hen feed diets. Ciência e Agrotecnologia, Lavras, v. 38, n. 6, p. 573-580, nov./dez. 2014. |
Resumo: | The effect of cholecalciferol (D3) and 25-hydroxycholecalciferol (25-OHD3) as isolated or associated sources of vitamin D (100%-0%, 75%-25%, 50%-50%, 25%-75%, 0%-100%) on the productive performance, egg quality, and bone characteristics was evaluated in white egg-laying hens fed two levels of calcium (Ca) and phosphorus (P) in the basal diet (BD) (BD1 = 0.38% Ca - 0.36% available P and BD2 = 3.2% Ca - 0.30% available P). Nine hundred and sixty Dekalb White hens (24 weeks old) were distributed into 80 cages, under a completely randomized factorial design for 16 weeks. The use of associated sources of vitamin D reduced the feed intake and feed conversion ratio, as well as BD1, which also increased the egg production and egg mass. The association of vitamin D sources with up to 50% 25-OHD3 increased the eggshell percentage. There was interaction (p<0.05) between the sources of vitamin D and the concentrations of Ca and available P, sources with at least 50% 25-OHD3 increased ash percentage and bone radiographic densitometry (BRD) with BD1; in BD2 the use of 25-OHD3 as isolated vitamin D source increased BRD. The association of D3 and 25-OHD3 improved the productive performance, increased the percentage of eggshell and had different positive effects on the bone characteristics that depend on the concentrations of Ca and available P in the balanced feed of white egg-laying hens. |
URI: | http://repositorio.ufla.br/jspui/handle/1/12757 |
Aparece nas coleções: | DZO - Artigos publicados em periódicos |
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