Combination of phytase and citric acid, but not phytase alone, ensures regular rates of growth and bone mineralization in quails under severe phosphorus restriction

An experiment was conducted to evaluate the effects of phytase (PHY), alone or in combination with citric acid (CA), on growing Japanese quails under moderate and severe phosphorus (P) restriction. For this, 504 one‐day‐old female quails were distributed in a completely randomised design with seven...

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Published in:	Journal of animal physiology and animal nutrition Vol. 103; no. 2; pp. 555 - 563
Main Authors:	Vieira, Bruno S., Caramori Junior, Joao G., Correa, Gerusa S. S., Colvara, Ines G., Brusamarelo, Emanuele, Pereira, Thuani V. S., Barbosa, Silvana A. P. V., Oliveira, Cleber F. S.
Format:	Journal Article
Language:	English
Published:	Germany Wiley Subscription Services, Inc 01-03-2019
Subjects:	6-Phytase - pharmacology Animal Feed - analysis Animal Nutritional Physiological Phenomena Animals Ashes Body weight gain bone densitometry Bone Density - drug effects Bone Development - drug effects Bone growth Calcium Calcium metabolism citrate Citric acid Citric Acid - administration & dosage Citric Acid - pharmacology Densitometers Densitometry Diet - veterinary Excretion Female Metabolism Mineralization Nutritional requirements organic acid Phosphorus Phosphorus - deficiency Phosphorus, Dietary - administration & dosage Phytase Plasma Quail Random Allocation Tibia phytase organic acid bone densitometry citrate quail
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Summary:	An experiment was conducted to evaluate the effects of phytase (PHY), alone or in combination with citric acid (CA), on growing Japanese quails under moderate and severe phosphorus (P) restriction. For this, 504 one‐day‐old female quails were distributed in a completely randomised design with seven treatments and six replications. Treatments consisted of the following diets: (a) positive control (PC): formulated according to quails nutritional requirements; (b) negative control 40% (NC40): PC with 40% less aP; (c) NC40+PHY; (d) NC40+PHY+CA; (e) negative control 65% (NC65): PC with 65% less aP; (f) NC65+PHY; (g) NC65+PHY+CA. Phytase and CA were included at 300 FTU/kg and 40 g/kg, respectively. Performance, bone mineralization and plasma mineral concentration were evaluated at day 35; calcium (Ca) and P metabolism, between days 36 and 39. No significant differences in performance, plasma Ca and P were detected between quails fed PC or NC40; however, NC40 decreased tibia ash (p < 0.01). Treatment NC65 impaired daily weight gain (p = 0.01), tibia ash (p < 0.01), and tibia optical densitometry (p = 0.03), as well as modified plasma Ca (p < 0.01) and P (p = 0.03) concentrations when compared to PC. Both NC40 and NC65 reduced P excretion (p < 0.01). Phytase alone restored tibia ash of NC40 quails to regular rates. Nevertheless, only PHY and CA combined returned plasma P, tibia ash, tibia optical densitometry, and daily weight gain of quails fed NC65 to similar values as those observed in PC. In conclusion, PHY alone suppresses the negative effects of moderate P restriction in growing Japanese quails, but fails in this task under severe P restriction. In such a situation, only the combination of PHY and CA ensures regular rates of growth and bone mineralization. This concept should be better explored by producers in order to take full advantage of the reduction in P excretion achieved by lowering dietary P concentrations.
Bibliography:	Funding information CAPES/Brazil, PhD scholarship for the first author. ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 ObjectType-Undefined-3
ISSN:	0931-2439 1439-0396
DOI:	10.1111/jpn.13074