Effects Of Deep Litter System On Pig Housing Environment And Meat Quality Of Pig

This study was designed to research the effects of deep litter system on emission of harmful gas, growth performance, slaughtered quality and meat quality of pigs.120 pigs weigh about 6.5kg were randomly allocated into 3 groups,4 replicates each treatment and 10 pigs per replicate, the whole experiment period lasted for 155d. The pigs in group 1 (control group) were raised on conventional slated floor housing system, and the pigs in group 2 and 3 were raised on deep litter housing system with different composition.18 pigs randomly selected from 3 groups were slaughtered and the concertration of harmful gas was measured in the end of the experiment period and some indices were determined. The results showed that:1. Effects of deep litter housing system on gaseous emissionsThe concertration of harmful gas was decreased by the deep litter system effectively, the concertration of H2S was lower than 0.5 mg/m3, the concertration of CO2 was 1443.3 mg/m3, and NH3 was 3.3 mg/m3 in deep litter system housing,and in slated floor housing CO2 was 3223.3 mg/m3 and NH3 was 19.8 mg/m3.The concertration of harmful gas in deep litter system were significantly lower than that of conventional housing(P<0.05).2. Effects of deep litter housing system on growth performance and slaughtered quality of pigsDeep litter housing system can significantly improve the growth performance of pigs. The live weight and average daily gains of pigs in groups 2 and 3 were significantly higher than pigs in groups 1 (P<0.05), the feed efficiency of groups 2 and 3 were significantly lower (P<0.05) than group 1, the carcass straight length and slanting length in group 2 and 3 were significantly longer (P<0.05) than group 1. The other performances of slaughtered quality have no significant differences among the different floor types.3. Effects of deep litter housing system on meat quality of pigsSome of the performances of meat quality in group 2 and 3 were significantly better than group 1 (P<0.05), the content of CP was increased by 3.57% and 3.44%, the meat colour was improved by 11.63% and 12.63%, and the ripe meat ration was increased by 5.71% and 4.42% respectively, and the drip loss of meat was lower significantly (P<0.05). The content of Thr, He, Lys, Gly, C18:1 and C18:3 in meat from group 2 and 3 were significantly higher than that in group 1 (P<0.05). The pH value, WHC, Tenderness, Marbling, IMF and the content of animalcule in meat has no significant differences.In summary, deep litter system can decreased the emission of harmful gas, and improve the growth performance and some indices of meat quality of pigs. And did not increase the content of animalcule in meat.