The formation of phytate-Ca complexes limits the action of the phytase in the gut, making not accessible the P phytic hydrolysis by the phytase and consequently reducing the amount of P released and absorbed through the intestine. And today this is the main problematic of phytase efficacy. This is the case for phosphorus which can encounter the anti-nutritional effect of calcium. But their absorption can be disturbed by the formation of insoluble complexes. Mineral absorption depends on the capacity of minerals to bind to transport protein present in enterocyte membrane (cf. But Kleyn and Chrystal, 2020, recommend caution to be taken in ascribing too high a value for the P contribution of phytase because problems may arise if there is inadequate substrate in the diet.įigure 2: Phosphorus absorption in poultry digestive tract Today, phytase incorporation tend to increase to 1000FTU/kg – 2000 FTU/kg, in order to release more P phytic from the diet (cf. On the other hand, vegetal source requires the action of specific enzyme, phytase, to release the P into the gut. Solubilisation is the natural process for mineral source of phosphorus. By contrast, neutral or alkaline pH of the intestine reduces their solubilisation. This process is pH-dependent, therefore the acidic environment in proventriculus and gizzard improves their solubilisation. Mineral absorption requires solubilisation of mineral original source in the intestinal lumen. The availability of minerals in typical feed ingredients varies and is primarily due to the formation or presence of poorly soluble complexes in both plant material and the GIT of birds. Mineral utilization by animals mainly depends on their absorption from the ingested feed in which minerals are found in a wide range of chemical form. ![]() How do minerals interact in the intestine? Phytic phosphorus from plant feed materials The quality of the phytase (used to release the P in the gut, originally under phytic form).To resume, plant-based phosphorus is influenced by 3 main factors: Moreover, phosphorus can also fluctuate from one source to another and from the quality of the land it was cultivated in. For example, corn and rye may bring approximately the same amount of P phytic (2.1 g/kg) but do not have the same total P content (2.9 g/kg vs 3.5 g/kg). As mentioned in Rostagno 2017 study, not all plant materials are equal in term of phosphorus content and percentage of phytic acid (cf. On one hand, plant-based phosphorus availability is highly dependent of the subtract. ![]() Phosphorus is brought to the diet by 85% from plant and 15% from inorganic feed phosphate and/or animal source.
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