Effects Of Cysteamine On The Growth Performance In Fattening Pigs

In this experiment efects of cysteamine on growth performance of finishing pigs was studied and some hormone concentrations levels, blood biochemical parameters, carcass traits and meat quality were determined. 192 "Duroc×Landrace×Yorkshire" pigs at the age of 110 days and about 60kg body weight were selected for this study. The pigs, were randomly divided into groupⅠ, groupⅡ, groupⅢand groupⅣ, and three replicates were designed in each group, each replicate was contained 16 pigs. GroupⅠwas as control group, fed the basal diet. GroupⅡ, groupⅢ, groupⅣwere as experiment groups fed the basal diet added with 200mg·kg^-1, 400mg·kg^-1, 600mg·kg^-1 of 30 percent cysteamine respectively.The results were as follows:1. Effect of cysmeatine on production performance and economic benefits of fattening pigs Average daily gain in groupⅡ, groupⅢ, groupⅣwere increased to 3.20%, 9.10%, 7.06% compared to groupⅠ. Among them, groupⅢand groupⅣwas great significantly higher than groupⅠ(P<0.01), significantly higher than groupⅡ(P<0.05) and no significant differences were observed between other groups (P>0.05). Feed conversion ratio in groupⅡ, groupⅢ, groupⅣwere decreased by 1.61%, 4.52%, 3.23% compared to groupⅠ. Among them, groupⅢwas significantly higher than groupⅠand groupⅡ(P<0.05), and no significant differences were observed between other groups (P>0.05). Economic benefits of groupⅡ, groupⅢ, groupⅣincreased to 14.44 yuan, 43.15 yuan, 29.52 yuan compared to group.2. Effect of cysmeatine on the blood level of hormones of fattening pigs Growth hormone concentrations in groupⅡ, groupⅢand groupⅣwere increased to 1.54%, 7.38% and 5.54% compared to groupⅠ. GroupⅢwas significantly higher than groupⅠ(P<0.05) and no significant differences were observed between other groups (P>0.05). Somatostatin concentrations in groupⅡ, groupⅢ, groupⅣwere decreased by 3.33%, 11.67%, 6.67% compared to groupⅠ. GroupⅢwas significantly higher than groupⅠ(P<0.05) and no significant differences were observed between other groups (P>0.05). T3 concentrations in groupⅡ, groupⅢand groupⅣwere increased to 4.00%, 8.00%, 6.00% compared to groupⅠ. GroupⅢwas significantly higher than groupⅠ(P<0.05) and no significant differences were observed between other groups (P>0.05). T4 concentrations in groupⅡ, groupⅢ, groupⅣwere increased to 3.45%, 4.94%, 4.47% compared to groupⅠ. The differences were not significant among them (P>0.05).3. Effect of cysmeatine on blood biochemical index of fattening pigs Serum urea nitrogen in groupⅡ, groupⅢ, groupⅣwere decreased by 8.57%, 12.75%, 5.27%, compared to groupⅠ. Among them, groupⅢwas significantly lower than groupⅠ(P<0.01), and no significant differences were observed between other groups (P>0.05). Total cholesterol in groupⅡ, groupⅢ, groupⅣwere decreased by 3.88%, 13.79%, 10.34%. The differences were not significant among them (P>0.05). Alanine aminotransferase ratio in groupⅡ, groupⅢ, groupⅣwere increased to 2.76%, 9.42%, 4.91%, compared to groupⅠ. GroupⅢand groupⅣwere significantly higher than groupⅠ(P<0.05), and no significant differences were observed between other groups (P>0.05).4. Effect of cysmeatine on carcass traits and meat quality of fattening hogs Lean meat rate of groupⅢwas significantly higher than groupⅠ(P<0.05), and no significant differences were observed between other groups (P>0.05). Bone ratio in groupⅢwas significantly higher than that in groupⅠ(P<0.01), and significantly higher than groupⅡ(P<0.05), and no significant differences were observed between groupⅢand groupⅣ(P>0.05). Fat ratio in groupⅡ, groupⅢand groupⅣwere decreased by 14.08%, 13.79%, 8.86%, compared to groupⅠ. GroupⅢwas significantly lower than groupⅠ, groupⅡand groupⅣ(P<0.01), and no significant differences were observed between other groups (P>0.05). Fat thickness of 6th rib and 7th rib in groupⅢand groupⅣwas decreased by 11.79%, 7.41%, respecively compared to groupⅠand was significantly lower than groupⅠ(P<0.01). No significant differences were observed between other groups (P>0.05). Eye muscle area between the groups was not significant (P>0.05). Hind legs ratio in groupⅢwas significantly higher than that in groupⅠ(P<0.05), and no significant differences were observed between other groups (P>0.05).Muscle pH and muscle color were no significant difference (P>0.05) among the groups. Intramuscular fat percentage in groupⅢand groupⅣwas significantly lower than groupⅠand groupⅡ(P<0.01), and no significant differences were observed between other groups (P>0.05). Muscle water content in groupⅢwas significantly higher than groupⅠ(P<0.05), and no significant differences were observed between other groups (P>0.05).Conclusion: In finishing pigs diets supplemented with 400mg·kg^-1 of 30 percent of cysteamine can promote the growth of fattening pig, reduce fat deposition, improving carcass quality, save the cost of feeding.