ORIGINAL PAPER
Effect of fertilization and variety on digestibility
of phosphorus from plant feedstuffs in pigs
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1
University of Bonn, Department of Animal Nutrition,
Endenicher Allee 15, D-53115 Bonn, Germany
2
University of Halle-Wittenberg, Department of Nutritional Sciences,
D-06099 Halle, Germany
Publication date: 2003-01-02
J. Anim. Feed Sci. 2003;12(1):83-93
KEYWORDS
ABSTRACT
Three experiments were performed to determine the digestibility of phosphorus in plant feedstuffs
for pigs. Pigs initially weighing 11 kg were kept in metabolism crates and fed twice daily at about 2 to
2.5-fold metabolizable energy requirement for maintenance. A semi-purified diet low in phosphorus
and without intrinsic phytase activity was fed either alone or after blending into test diets containing
60% of barley or wheat or 40% of field bean or rye. Mixtures were calculated to contain not more
than 2 g digestible P/kg DM and between 5.0 to 6.0 g Ca/kg DM. Faeces and urine were quantitatively
collected for 7 days after 7 days of adaptation. Phosphorus digestibility for ingredients under test
was calculated from differences of results on test and basal diet. Digestibility of phosphorus in three
different batches of rye was 70% on average. In two batches of field bean the digestibility coefficient
was 36%. Phosphorus digestibility in 12 batches of wheat ranged from 43 to 59%, with a mean of
56%, in six batches of barley the digestibility coefficient ranged from 42 to 52% with a mean of 46%.
There was no effect of fertilization with nitrogen or phosphorus on the digestibility of phosphorus
in wheat, rye or barley. A variety effect on digestibility was indicated for barley and wheat. No clear
relation was found between P digestibility on the one hand and portion of phytate-bound P or activity
of intrinsic phytase activity on the other hand.
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