Effects of Low Protein Diets Supplemented with Ami- no Acids on Production Performance, Carcass Qual- ity and Input-output Ratio of Pigs

摘要

[Objectives] To study the effects of low-protein diets supplemented with amino acids on the production performance,carcass quality and input-output ratio of fattening pigs and growing-finishing pigs. [Methods] Two studies were conducted on fattening pigs and growing pigs respectively. Pigs in two experimental groupswere fed with low-protein diets supplemented with amino acids and normal diets respectively,and the initial weight,final weight,feed consumption and carcass index of the tested pigs were measured.[Results]The average final weight of fattening pigs in test group was 2. 4 kg lower than that in control group,while the difference was not significant( P > 0. 05). The average daily gain of fattening pigs in test group was 60 g lower than that in control group,indicating that low protein diets had a tendency to decrease the growth rate( P > 0. 05),and reduction of daily weight gain in low protein diet pigs reached 7. 6%. The development of pigs in low protein diet group was poor,however,the difference was not significant. Carcass backfat thickness in low-protein diet group was slightly higher than that in control group,the difference was significant( P 0. 05).[Conclusions]Production performance of the pigs would be decreasedand the input-output ratio could not be improvedwhen the adding contents of crude protein in diets was reduced 3%-4%. Therefore,it is recommended that the crude protein level should be enough when pigs were fed with low-protein diets.