Effects of dietary Ca/P ratio, P level and microbial phytase supplementation on nutrient digestibilities in growing pigs: precaecal, post‐ileal and total tract disappearances of OM,

Abstract

Eight female pigs (26–61 kg) provided with a simple T‐cannula about 10 cm proximal to the ileo‐caecal valve, were used in two experiments to investigate the effects of Ca/P ratio, P level and supplementation with phytase (500 FTU/kg) on precaecal, post‐ileal and total tract disappearances of organic matter (OM), phosphorus (P) and calcium (Ca). In experiment 1, two Ca/P ratios and two P levels were tested according to a 2 × 2 factorial arrangement within a Latin square design. In experiment 2, the diets of experiment 1 were supplemented with phytase (500 FTU/kg). There was a substantial absorption of OM, P and Ca in the post‐ileal tract for all diets. Precaecal and total tract disappearances of OM were reduced by phytase addition (−4.4 and −0.8%, respectively). Supplementation with phytase resulted in an improvement of total tract and post‐ileal P disappearances by 10.3 and 12.1%, respectively, without affecting precaecal P disappearance. Addition of feed phosphate resulted in a higher precaecal disappearance of P (+10.8%), resulting in a higher total tract disappearance of P (+5.9%). Addition of limestone had little effect on disappearances of OM, P and Ca, but reduced activity of supplemental phytase and had a negative influence on growth performance. Precaecal, post‐ileal and total tract Ca disappearances were hardly affected by the examined dietary factors. The results might indicate that P from feed phosphate is absorbed primarily prececally and that P from phytate, liberated by microbial phytases, is dominantly absorbed post‐illeally.

Influence of feeding level and dietary oil supplementation on apparent ileal and total tract digestibilities of phosphorus and calcium in pigs fed low-phosphorus diets supplemented with microbial or wheat phytase

“…Therefore, it can be speculated that dietary supplementation with microbial phytase, which decreased the amounts of P entering the large intestine, might have stimulated the production of bacterial phytases, finally resulting in a higher degradation of lower inositol phosphates. This is supported by Seynaeve et al (2000a) who suggested that supplementation with microbial phytase might stimulate the development of the intestinal microflora already in the small intestine.…”

Desempenho, características de carcaça e composição óssea de suínos alimentados com diferentes níveis de ractopamina e fitase

“…Assim, a redução da fonte de fósforo inorgânico e a consequente complementação dos níveis nutricionais pela liberação de cálcio e fósforo fíticos por meio da fitase em dietas com ractopamina manteve o desempenho dos animais com 500 ou 750 uf. Dessa forma, o uso de fitase em maior inclusão pode reduzir os custos das dietas, uma vez que disponibiliza nutrientes intrínsecos dos cereais, minimizando a complementação com fonte inorgânica, além de reduzir o impacto ambiental pela diminuição da excreção de elementos poluidores como o próprio fósforo, pela melhoria da digestibilidade das dietas (Seynaeve et al, 2000;O'Quinn et al, 1997;Simons et al, 1990).…”

FLUCTUATION OF POST-PRANDIAL PLASMA MINERAL LEVEL OF JUVENILE JAPANESE FLOUNDER, Paralichthys olivaceus FED DIETARY PHOSPHORUS AND PHYTASE SUPPLEMENTATION

“…Mineral content of diet has been reported to be one of the most critical factors affecting the efficacy of phytase in vivo in poultry Angel et al (2002) and swine (Seynaeve et al, 2000). However, limit information is available in fish species including our previous study dealing with juvenile tiger puffer (Laining et al, 2010b).…”