Study on Deep Litter System for Management of Livestock Manure Evaluation on Effects of Deep Litter System on Pig Growth in High Temperature and RH Season

Deep-litter systems have been developed as an alternative management for domestic animal manure and utilized in temperature and cold area in world. In Jiangsu province, both temperature and relative humidity in summer are very high, the effects of deep litter system on pig growth need to be evaluated. A pile experiment was carried out on pig feed farm near Nanjing city. Effects of both feeding pig methods with deep litter and no litter on pig growth and reducing waste water and excreta discharge were compared, the differences between deep litter and shallow litter, both litters with saw dust and mixture of saw dust and rice hull with ratio of 1∶1(V/V) on pig growth were also analyzed. The results showed that the diseases incidence decreased by 19.7% in deep litter system than that in no litter. The pig growth rate had no significant difference between deep litter and no litter. Water consumption in deep litter system decreased by 82.07% compared with that in no litter. No differences between deep and shallow litter, only saw dust and mixture litter on pig growth were found. A pig farm with ten thousand heads of pig could reduce 108 000 m3 waste water and 21 600 t animal manure discharge to the environment and one billion yuan economic benefit would be increased if using the deep litter system. The deep litter system can be utilized in height temperature and humility season in south area of China.