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Energy sources and edible carbohydrate shortages are the world-wide problems. Lignocellulose, which yearly production is about 7 billion tons with 70% belonging to crop stalks, is the largest renewable energy source (Kaur and Kuhad, 2019). Unfortunately, most of it is discarded, buried or burned in the field because lignin can maintain the cell wall permeability and support the plant cell wall, which is combined with cellulose and hemicelluloses to form crystal structure to resist enzymatic hydrolysis and microbial attack for the further application (Saha et al., 2005). If lignocellulose is transferred to low-molecular carbohydrate, it will help to solve energy crisis. In numerous studies it was shown that physical, chemical and biological treatments are the effective methods improving the potential value of crop straw to be used as feedstuff for monogastric animals, at the same time replacing the conventional grains such as maize, wheat, rice and others (Chang et al., 2015; Aguilar et al., 2018; Kaur and Kuhad, 2019; Siddhu et al., 2019; Wang et al., 2019). In our previous research we have shown that Aspergillus oryzae can produce numerous kinds of enzymes such as protease, amylase, cellulase to help degrade maize stover (Chang et al., 2015); therefore, it is appropriate for feed fermentation. The optimal dietary fibre content is beneficial for the development of pig intestine and the reduction ABSTRACT. In order to increase the nutritive values of maize stover, the processes of steam explosion and microbial fermentation with Aspergillus oryzae were used to produce processed maize stover (PMS). In the digestive experiment on swine it was shown that dietary digestible energy (DE) was decreased when PMS substitute rates for maize meal were increased from 5 to 15% (P < 0.05). In each of two-stage swine feeding experiment were 5 groups with 3 replications in each: group 1 – control, groups 2–4 – diets supplemented with 5, 10 or 15% PMS, respectively (as a replacement of the same amount of maize meal), group 5 – diet supplemented with 10% PMS with DE level the same as in the control group. It was indicated that average daily gain and nutrient digestibility were similar in groups with 0 and 5% PMS addition but were decreased when PMS addition increased from 5 to 15%. It can be concluded that the optimal levels of PMS in diets were below 10% for younger pigs and 15% for older ones. PMS addition could help to increase faecal enzyme activity and decrease swine diarrhoea rates. So, the insights that optimal PMS levels could relieve shortage of energy feedstuffs were provided in this study. Received: 5 April 2020 Revised: 19 April 2020 Accepted: 21 May 2020

Effect of processed maize stover as an alternative energy source in swine production