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Low phytic acid barley for broiler chickens

Excessive phosphorus excretion by intensive livestock operations is a growing concern worldwide. Identification of non-lethal, low phytic acid mutations in corn, and more recently barley, result in a substantial reduction in phytic acid, with a corresponding increase in inorganic phosphorus. In the present study, four varieties of the low phytic acid( LP) barley including LP 422, LP 635 , LP 955 and LP 1070 and a conventional barley( CDC DOLLY) were examined with broiler chickens from 2 to 17 days of age. LP barley lines exhibiting a range of various phytic acid reduction indicated increasing phosphorus retention (P<0.01), which was reflected by increasing tibia ash in phosphorus deficient diets. Phosphorus excretion was reduced accordingly (P<0.01). Body weight gain (P<0.05) and feed conversion (P<0.01) also improved with phytic acid reduction; feed conversion in particular was significantly better for chicks given the lowest phytic acid barley line( LP 955) than a commercial variety. Retention of major nutrient fractions (phosphorus excepted; dry matter, fat, protein, amino acids) indicated no significant effect with phytic acid reduction.