Phosphorus characterization in feces from broiler chicks fed low-phytate barley diets

Leytem, A.B. and Thacker, P.A. and Turner, B.L. (2007) Phosphorus characterization in feces from broiler chicks fed low-phytate barley diets. Journal of the Science of Food and Agriculture. 87:1495-1501.

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Abstract

The inclusion of low phytate grains in poultry diets can reduce the phosphorus (P) content of poultry
feces, but their influence on fecal P composition is not well established. To assess this, 100 male broiler chicks
(21 days old) were fed dietary treatments based on either a wild-type barley or one of three low phytate mutant
barleys with 59, 62 and 99% reductions in phytate P, compared with the normal barley diet. The birds were housed
in raised-floor battery cages with mesh grate floors above fecal collection trays with five birds per pen and five
pens per treatment. The birds were fed for 9 days and feces were collected twice a day during the last 2 days of the
experiment. Total P concentrations were 14-24% lower in feces from birds fed low phytate barley diets compared
with those fed the normal barley diet. Phosphorus digestibility increased (P < 0.05) as phytate in the barley diet
decreased. Phosphate was the major P fraction in the feces (69-75% extracted P) regardless of the type of barley
fed. Phytate constituted only 3-12% of the P in the feces, indicating its hydrolysis in the bird. Overall, these
results suggest that feeding low-phytate barley diets can reduce P concentrations in poultry feces without causing
significant changes in P composition.

Item Type:	Article
NWISRL Publication Number:	1214
Subjects:	Irrigated crops > Small grain Manure > Application guidelines > Small grains Manure > Chemistry Mass Import - autoclassified (may be erroneous)
Depositing User:	Users 5 not found.
Date Deposited:	20 Nov 2010 21:49
Last Modified:	01 Nov 2016 14:59
Item ID:	53
URI:	https://eprints.nwisrl.ars.usda.gov/id/eprint/53