Abstract
Two experiments were conducted to
investigate whether the choice of digestibility marker
or marker concentration in corn-soybean meal diets
infl uence apparent ileal AA digestibility (AIAAD)
or the potential phytase-induced improvement in
AIAAD in broiler chickens and pigs. One hundred
ninety-two, 42-d-old, Ross 708 broilers were used
in a 7-d study in Exp 1. The birds were allocated to
6 dietary treatments in a 2 × 3 factorial arrangement
of treatments in a split-plot design. The factors were
a combination of chromic oxide and titanium dioxide
(0.3% or 0.5% of both markers, as-fed basis), and 3
levels of phytase inclusion [0, 500, or 1,000 phytase
units (FTU)/kg]. In Exp. 2, 6 barrows fi tted with a
simple T-cannula at the distal ileum were allocated to 4
diets in a 6 × 4 Youden square design and 2 × 2 factorial
arrangement of treatments. The factors were similar to
Exp. 1, except the 500-FTU/kg phytase level was not
used in Exp. 2. There were no marker type × marker
concentration, phytase × marker type, or phytase
× marker type × marker concentration interactions
for any of the AA in either experiment. On average,
AIAAD values calculated using Ti was greater (P <
0.05) than those calculated using Cr, regardless of the
phytase inclusion level in both experiments. In Exp. 1,
AIAAD values for His, Trp, Cys, and Pro were greater
(P < 0.05) at the 0.3% than 0.5% marker concentration.
The AIAAD values were consistently greater when
calculated using Ti compared with Cr, irrespective of
phytase level. It is concluded that the type of marker
used does not infl uence whether a response to phytase
supplementation, in terms of AIAAD, is observed.
Original language | English |
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Pages (from-to) | 4414 - 4420 |
Number of pages | 7 |
Journal | Journal of Animal Science |
Volume | 90 |
Issue number | 12 |
Publication status | First published - 2012 |
Bibliographical note
2063344Keywords
- Amino acids
- Chromium
- Digestibility
- Phytase
- Titanium