Standard phytase inclusion in maize-based broiler dietsenhances digestibility coefficients of starch, amino acids and sodium in four small intestinal segments and digestivedynamics of starch and protein

The effects of the 500 FTU/kg inclusion of Buttiauxella phytase in maize-based broiler diets were investigated where each treatment consisted of eight replicates of six male Ross 308 chicks per cage. Apparent digestibility coefficients of starch, sixteen amino acids and nine minerals in four small intestinal segments were determined in broilers offered P-adequate, maize-based diets at 40 days post-hatch. The disappearance rates of starch and protein (the sum of amino acids) from the four small intestinal segments were calculated and starch:protein disappearance rate ratios deduced in order to assess the effects of phytase on digestive dynamics. Phytase increased starch digestibility coefficients in the proximal jejunum (0.681 versus 0.538; P = 0.001) and distal ileum (0.959 versus 0.936; P = 0.009) and starch disappearance rates in the proximal jejunum (58.0 versus 43.4 g/bird/day; P = 0.004) and proximal ileum (80.8 versus 71.4 g/bird/day; P = 0.036). Phytase significantly increased (P = 0.003 – <0.001) amino acid digestibilities in four small intestinal segments with the most pronounced responses being observed in the proximal jejunum. Average amino acid data indicated that protein digestibility coefficients and disappearance rates were signifi- cantly (P = 0.002 – <0.001)increased in the four small intestinal segments. The magnitude of the responses to phytase inthe proximaljejunumfor bothproteindigestibility (0.791 versus 0.481; P < 0.001) and protein disappearance (23.77 versus 15.06 g/bird/day; P < 0.001) were substantial. Digestibility coefficients of both Na and P were significantly (P = 0.027 – <0.001) improved in four small intestinal segments by phytase but this did not apply to Ca. Na digestibility coefficients were significantly correlated to those of starch in three small intestinal segments including the proximal jejunum (r = 0.900; P < 0.001) and Na digestibilities were significantly correlated to protein in four small intestinal segments including the proximal ileum (r = 0.862; P < 0.001). Phytase condensed starch:protein disappearance rate ratios (P = 0.015 – <0.001) in the three caudal segments of the small intestine. A multiple linear regression equation (r = 0.936; P < 0.001) indicated thatincreasing protein disappearance rates from the proximal ileum would be advantageous, whereas, increasing starch

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Product / service:	Phytases
Publication date:	01/08/2015
Species:	Broiler
Authors:	Truong, HH, Bold, R.M, Liu, SY, Selle PH
Doctype:	Publications & Citations
Publication / conference:	Animal Feed Science and Technology
Regions and countries:
Keywords:	mineral, correlation
Production challenge(s):	Phytate degredation to improve profitability and performance
Diets:	All diets
Brands:	Axtra® PHY
Resource ref:

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Standard phytase inclusion in maize-based broiler dietsenhances digestibility coefficients of starch, amino acids and sodium in four small intestinal segments and digestivedynamics of starch and protein

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