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Title: Progress in comprehending the phytate-phytase axis in chicken-meat production
Contributor(s): Moss, Amy F  (author)orcid ; Liu, Sonia Yun (author); Selle, Peter H (author)
Publication Date: 2018-02-28
DOI: 10.1071/AN17594
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Abstract: After an extended delay, the level of acceptance of exogenous phytases by the global chicken-meat industry is now almost complete. Contemporary bacterial phytases degrade phytate primarily in the gizzard. The extent of phytate degradation determines the extent to which phytate-bound phosphorus (P) is liberated; however, studies designed to investigate phytate degradation along the digestive tract have generated some confusing outcomes. This may be related to the reactivity of the phytate moiety, coupled with problems with inert dietary markers and perhaps a lack of complete and uniform extractions of phytate from digesta due to variations in digesta pH and phytate solubility. Quite recently, phytase was shown to have profound impacts on sodium (Na) digestibility coefficients in four segments of the small intestine. This has obvious implications for intestinal uptakes of glucose and amino acids via their respective Na⁺-dependent transport systems and it is possible that phytate and phytase have reciprocal impacts on ‘sodium pump’ (Na⁺, K⁺-ATPase) activity. It has been recently demonstrated unequivocally that phytase has the capacity to increase amino acid digestibility coefficients to the extent that phytase may generate a ‘proximal shift’ in the sites of amino acid absorption. The impact of phytase on starch digestibility is more equivocal and phytase responses may stem more from enhanced glucose absorption rather than starch digestion. The acceptance of phytase is hardly surprising, given its capacity to increase P utilisation coupled with numerous other positive influences that are still being properly realised.
Publication Type: Journal Article
Source of Publication: Animal Production Science, 58(10), p. 1767-1778
Publisher: CSIRO Publishing
Place of Publication: Australia
ISSN: 1836-0939
Field of Research (FoR) 2008: 070204 Animal Nutrition
070202 Animal Growth and Development
Field of Research (FoR) 2020: 300303 Animal nutrition
300301 Animal growth and development
Socio-Economic Objective (SEO) 2008: 830309 Poultry
Socio-Economic Objective (SEO) 2020: 100411 Poultry
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
Appears in Collections:Journal Article
School of Environmental and Rural Science

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