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Effects of high moisture airtight storage of barley with exogenous enzymes on phosphorus digestibility of barley fed to pigs alone or in combination with soybean meal

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The aim was to study the effect of storage (high moisture airtight (HMA) storage vs. dry storage) and a combination of phytase, xylanase, β-glucanase, and protease on nutrient solubility and digestibility of barley. Experiment 1 studied the effect of HMA stored barley at 29%, 35%, and 40% moisture and enzyme combination to define the optimum moisture level for the maximum nutrient solubility of barley. The ‘35% moisture’ was chosen for HMA storage of barley because this treatment (without or with enzymes) enhanced phytate degradation (31–73%) and the solubility of P (125–177%), nitrogen (N) (95–125%) and protein (56–68%) compared to dry storage (P < 0.05) and at the same time seemed to prevent a loss of energy and N (ammonia) by microbial fermentation. In Exp. 2, 6 female growing pigs (43 ± 2 kg) were used per diet (8 diets, 48 pigs) in a 12-d nutrient digestibility study to assess the effect of HMA stored barley at 35% moisture and enzyme combination on coefficient of total tract apparent digestibility (CTTAD) of P in barley fed alone or together with soybean meal (SBM). Also, HMA storage of barley at ‘35% moisture’ without and with enzyme combination enhanced phytate degradation (43–58%) and P solubility (2.5–3.3 fold) (P < 0.05). Thus, HMA stored barley (solely endogenous enzymes) enhanced CTTAD of P to almost the same extent as dry stored barley with enzyme combination (endogenous enzymes plus added enzymes) in the barley diet (45–49%) and the barley-SBM diet (15–25%) (P < 0.05). Adding the enzyme combination to HMA stored barley achieved the greatest increase of CTTAD of P in the barley diet (70%) and the barley-SBM diet (36%) (P < 0.05). The inclusion of the enzyme combination to HMA stored barley tended to enhance the calculated CTTAD of P of SBM (29%) compared with no enzyme combination (P = 0.06) due to the lower endogenous enzymes activity in HMA stored barley. It is necessary to add the enzyme combination to enhance P digestibility of SBM when fed together with HMA stored barley. Overall, HMA storage with enzyme combination is a potential method to enhance P digestibility of barley in pigs to reduce the dietary need for inorganic P addition and P excretion to the environment.

TidsskriftAnimal Feed Science and Technology
StatusUdgivet - aug. 2020

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