ORIGINAL PAPER
Differences in phosphorus digestibility and metabolizable energy
concentrations of rye- or wheat-based compound feeds in pigs
1
University of Bonn, Institute of Animal Science, Endenicher Allee 15, D-53115 Bonn, Germany
Publication date: 2024-01-31
Corresponding author
K.-H. Südekum
University of Bonn, Institute of Animal Science, Endenicher Allee 15, D-53115 Bonn, Germany
University of Bonn, Institute of Animal Science, Endenicher Allee 15, D-53115 Bonn, Germany
J. Anim. Feed Sci. 2024;33(2):200-210
KEYWORDS
TOPICS
ABSTRACT
In this study, two trials were conducted to determine phosphorus
(P) digestibility and metabolizable energy (ME) concentrations of compound
feeds. The feeds were formulated with either wheat or hybrid rye supplemented
with soybean meal (SBM) or rapeseed meal (RSM). The compound feeds were
fed with (+) (trial 1) or without (−) (trial 2) phytase supplementation to estimate
the effect of intrinsic phytase activity in wheat and rye. In addition, nitrogen (N)
balance of the test rations was evaluated. The P content in each test ration,
consisting of a basal ration (deficient in P) and a compound feed, was adjusted
to keep digestible P below 2.0 g/kg dry matter. All compound feeds were tested
in a duplicate 3 × 3 Latin Square design. Pigs were kept in metabolism crates
for a 7-day adaptation period and a 5-day collection period during which faeces
and urine were quantitatively collected. Phytase supplementation (P < 0.05)
and the source of protein supplementation (P < 0.05) exerted an influence
on P digestibility. Phytase supplementation levelled P digestibility, resulting in
values of 70.2% and 69.5% for SBM-compound feed and RSM-compound feed,
respectively. The type of cereal grain had no effect on P digestibility of compound
feeds, indicating that intrinsic phytase did not show differential efficacy. The
ME concentration of all compound feeds was high (≥ 14.2 MJ/kg dry matter)
and appropriate for growing pigs. Phytase supplementation had no effect on
ME concentration of compound feeds. Rye and RSM, containing higher fibre
concentration than wheat and SBM, shifted N excretion from urine to faeces,
which may help to reduce ammonia release from slurry.
FUNDING
The study was supported by funds from the
Federal Ministry of Food and Agriculture (BMEL,
Germany) based on a decision of the Parliament of
the Federal Republic of Germany, administered by
the Federal Office for Agriculture and Food (BLE,
Germany) under the Innovation Support Programme
(support code 281B101216).
CONFLICT OF INTEREST
The Authors declare that there is no conflict of
interest.
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