Fontes alternativas de cálcio e fósforo para poedeiras comerciais

Abstract

RESUMO Alternative sources of calcium and phosphorus for commercial laying hensABSTRACT -The objective of this study was to evaluate the monoammonium phosphate (MAP) as a source of phosphorus and Paraíso limestone (CP) with higher magnesium levels (1.92%) as a source of calcium for commercial layers. A total of 280 white Dekalb chickens were housed in individual cages during the period from 46 to 58 weeks old.A completely randomized experimental design, with four diets, seven replicates and ten birds per experimental unit were used. The diets were: FBC/CB -dicalcium phosphate and Barroso limestone (gray); FBC/CP -dicalcium phosphate and Paraíso limestone (white); MAP/CB -monoammonium phosphate and Barroso limestone; MAP/CP -monoammonium phosphate and Paraíso limestone. Egg production, mean weight and egg mass; feed intake and feed conversion were evaluate, and also shell percentage and thickness. Egg production, mean egg weight and mass improved with the use MAP with both evaluated limestone. Feed intake and feed conversion improved with utilization of MAP as source of phosphorus. Egg shell percentage and thickness were not affected by calcium source in the diet, hence, the higher level of Mg and finer particles of Paraíso limestone did not impaired egg shell quality. No alterations were observed in feces consistency and survival rate of the layers. The nitrogen excretion was 10% higher for birds that received MAP as a phosphorus source. Monoammonium phosphate could be used as an alternative source of phosphorus replacing dicalcium phosphate; and Paraíso limestone is technically viable for feeding commercial layers without problems for egg production and shell quality.

Productive, Qualitative, and Physiological Aspects of Layer Hens Fed with Propolis

“…Eggshell Ca and P contents were influenced by the treatments (p<0.05), with the hens fed the diet with 1% presenting higher levels compared with those in the other treatments. However, this did not influence egg quality (Couto et al, 2008). Calcium is an important nutrient for birds, and it is an essential for metabolic functions and eggshell formation (Araújo et al, 2008).…”

Utilização da farinha de algas calcáreas na alimentação animal

“…Contudo, comprovada sua viabilidade zootécnica, a opção entre as diferentes fontes é realizada com base no custo por unidade de fósforo biodisponível, e não na unidade de fósforo total (Couto et al, 2008).…”

Exigências De Fósforo Disponível Para Aves Com O Uso Do Fosfato Monoamônio

“…Alguns trabalhos evidenciaram a melhoria do Pd do MAP para aves, sugerindo mudanças nas recomendações quando se utiliza essa fonte de P (GOMES et al, 1993;DAMROM & FLUNKER, 1991), indicando como fonte alternativa de alta biodisponibilidade. Trabalhos com poedeiras (COUTO et al, 2008) também evidenciaram melhoria da produção e peso dos ovos quando substituíram o fosfato bicálcico pelo MAP nas rações dessas aves.…”