Long-term reconstitution with water of dry barley before feeding increases phosphorus digestibility in pigs

作者：Nu M A Ton; Blaabjerg K; Poulsen H D^*

来源：Journal of Animal Science, 2016, 94: 100-102.

DOI：10.2527/jas2015-9792

• barley
• phosphorus digestibility
• phytase
• phytate
• pig
• reconstitution

Cereals are normally stored dry at low moisture content (< 14%) to maintain grain quality. The hypothesis was that reconstitution of grain with water activated the endogenous enzymes and made grain nutrients more soluble and digestible. The objective was to investigate the effect of reconstitution compared to dry stored barley on apparent total tract digestibility (ATTD) of P in pigs. Dry barley (12% moisture; total P, 3.3 g/kg DM; phytate P, 1.7 g/kg DM) was rolled and stored directly or reconstituted with water to produce rolled barley with 35% moisture that was stored in air-tight conditions. After 49 d of storage, 2 diets were prepared with dry barley or reconstituted barley as the sole source of dietary P. Twelve pigs (43 +/- 2 kg) housed in metabolism crates were fed either dry barley or reconstituted barley for 5 d of adaptation and 7 d of feces collection. Reconstituted barley contained numerically more soluble P (2.56 g/kg DM) and less phytate P (0.93 g/kg DM) than dry barley (0.78 and 1.7 g/kg DM). Pigs fed the reconstituted barley diet showed an increase in P absorption (54%, P < 0.001) and a decrease in P excretion in feces (31%, P = 0.003) compared with pigs fed dry barley. Reconstitution increased the ATTD of P of barley from 40.0% to 59.6% (P < 0.001). In conclusion, reconstitution of dry barley increased ATTD of P and reduced fecal P excretion. Therefore, using the reconstituted barley in pig diets has the potential to reduce the feed phosphate supplementation and the P excretion through manure. Studies are needed to evaluate the overall effect when reconstituted cereals are mixed with other feedstuffs in formulated diets.

• 出版日期2016-9