Data/hora: 06/06/2024 02:57:58

Provedor de dados: 	96	
País: 	Brazil	
Título: 	Effects of 1,25-dihydroxycholecalciferol and reduced vitamin D3 level on broiler performance and bone quality	
Autores: 	Castro,Fernanda Lima de Souza; Baião,Nelson Carneiro; Ecco,Roselene; Louzada,Mário Jefferson Quirino; Melo,Érica de Faria; Saldanha,Mariana Masseo; Triginelli,Marcela Viana; Lara,Leonardo José Camargos.	
Data: 	2018-01-01	
Ano: 	2018	
Palavras-chave: 	Broilers; Growth performance; Solanum glaucophyllum.	
Resumo: 	ABSTRACT This study was conducted to evaluate the effect of two levels of vitamin D3 with or without 1,25- dihydroxycholecalciferol (1,25(OH)2D3) on live performance and bone quality of broiler chickens. For that, we used a completely randomized design in a 2 × 2 factorial arrangement, with eight replicates of 30 Cobb®500 male broiler chicks each (n = 960). The two levels of vitamin D3 and the addition or not of 0.5 μg 1,25(OH)2D3/kg were considered as main factors. The vitamin D3 levels were: 2500/2000 IU/kg and 1250/1000 IU/kg for the starter (1 to 21 days) and grower (22 to 40 days) phases, respectively, with the first representing the levels used in industry (100%) and the second, a reduction in 50% of those levels. The 1,25(OH)2D3 source was Solanum glaucophyllum. On days 21 and 40, one broiler per replicate was killed and long bones were removed for analyses of mineral percentage, bone mineral density, biomechanical properties, and morphology. No significant differences were found related to vitamin D3 levels and the addition or not of 1,25(OH)2D3 for live performance, mineral percentage, strength, stiffness, and morphology. Toughness was lower when 1,25(OH)2D3 was used at 21 days, but this effect was not observed at 40 days of age. Bone mineral density was greater when 100% of vitamin D3 was used at 40 days of age. The reduction of up to 50% of vitamin D3 levels is sufficient to ensure performance and bone development of broilers at 21 and 40 days of age. The inclusion of 0.5 μg 1,25(OH)2D3/kg in addition to diets with sufficient levels of vitamin D3 shows no effect on the improvement of those parameters at the same ages.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982018000100506	
Editor: 	Sociedade Brasileira de Zootecnia	
Relação: 	10.1590/rbz4720170186	
Formato: 	text/html	
Fonte: 	Revista Brasileira de Zootecnia  v.47 2018	
Fonte: 	info:eu-repo/semantics/openAccess