Sorghum And Enzyme As Substitute Of Corn In Diet For The Performance On Cherry Valley Ducks

This study was conducted to investigate the effects of sorghum supplementation with different proportion of corn in diets,and to compare the effects of compound enzyme preparation on growth performance,slaughter performance,immune organ index and meat quality of meat ducks fed by cherry grain.A total of 2500 one-day-old healthy ducks fed by cherry grain were randomly divided into 5 groups with 5 replicates in each group.The five groups were control group(corn type diet),50% replacement group(sorghum replaced 50% corn),50% replacement + compound enzyme group(sorghum replaced 50% corn + compound enzyme preparation),100%replacement group(sorghum replaced 100% corn),and 100% replacement + compound enzyme group(sorghum replaced 100% corn + compound enzyme preparation).The experiment lasted for 38 days and was divided into early period(1 to 14 days)and later period(15 to 38 days).The results are as follows:1.Production performance:(1)The influence of sorghum on the average daily feed intake was as follows.There was no significant difference in the feed intake in the early,late and whole period of the experiment(P > 0.05)in the group with sorghum replaced 50% corn.The group replaced by with100% had significant effects on feed intake(P < 0.05).The group with the addition of enzyme preparation had no effect on the feed intake in the early,late and whole period of the experiment.(2)The effects of sorghum on the average daily gain are as follows.There was no significant difference in the average daily gain(P > 0.05)when 50% corn was replaced with sorghum in the early,late and whole period of the experiment.The replacement of 100% corn had significant effects on the average daily gain(ADG)(P < 0.05);The average daily gain(ADG)increased with the addition of enzyme preparation,but the difference was not significant(P BBB 0 0.05).After 50% replacement,the average daily gain increased by 1.39%,0.37% and 0.60% in the early,late and whole period of the experiment,respectively.After adding compound enzyme preparation in 100% replacement group,the average daily gain was increased by 2.88%,2.00% and 2.22% in the early,late and whole period of the experiment,respectively.(3)The effects on feed to gain ratio are as follows.The group with sorghum replacing50% corn had no significant effect on feed to gain ratio in the early,late and whole period of the experiment(P > 0.05);When sorghum replaced 100% corn,the ratio of feed to gain was significantly affected(P < 0.05).There was significant difference in the ratio of feed to gain when the enzyme preparation was replaced by 50%(P < 0.05).The ratio of feed to gain was decreased by 3.10%,3.06% and 3.21% in the early,late and whole period of the experiment,respectively.(4)The effects on the survival rate are as follows.There was no significant effect on the survival rate(P > 0.05)when 50% corn was replaced by sorghum,100% corn was replaced by sorghum,and enzyme preparation was added,.2.Slaughter performance:There was no significant difference in the slaughter percentage,half eviscerated percentage,fully eviscerated percentage,breast muscle percentage and leg muscle percentage of meat ducks fed by cherry(P > 0.05).After the addition of enzyme preparation,the half-eviscerated percentage,eviscerated percentage and breast muscle percentage had a tendency to increase,but the differences were not significant(P > 0.05).After 50% corn was replaced by sorghum and 100% corn was replaced by sorghum,the abdominal fat percentage had a decreasing trend,but the difference was not significant(P > 0.05).However,after the addition of enzyme preparation,the abdominal fat percentage was improved,but the difference was not significant(P> 0.05).3.Immune organ index:There was no significant difference in thymus index,spleen index and bursa index of meat ducks fed by cherry after 50% corn and 100 corn were replaced by sorghum(P >0.05).After adding enzyme preparation,there was no significant difference either.(P > 0.05).4.Muscle quality:(1)The effects of sorghum on muscle nutrients are as follows.The group with sorghum replaced 50% and 100% corn respectively had no significant effect on the moisture content of breast muscle and leg muscle(P > 0.05).There was no significant difference after adding enzyme preparation(P > 0.05).The crude protein content of breast muscle and leg muscle had a tendency to decrease,and the difference was significant(P < 0.05),but it was significantly increased after adding enzyme preparation(P < 0.05).The crude lipid content of breast muscle and leg muscle was significantly decreased(P < 0.05),but it was significantly increased after adding enzyme preparation(P < 0.05).(2)The effects of sorghum on the p H value of muscle are as follows.There was no significant difference in the p H value of breast muscle and leg muscle after 45 min and 24 h placement in the group with sorghum replaced 50% and 100% corn respectively(P >0.05).After adding enzyme preparation,there was no significant difference either(P > 0.05).(3)The influences on the drip loss rate of muscle are as follows.The drip loss rate of breast muscle and leg muscle were not affected in the group with sorghum replaced 50% and100% corn,respectively,and the difference was not significant(P > 0.05).After adding enzyme preparation,there was no significant difference either(P > 0.05).In conclusion,the substitution of sorghum for corn and the addition of enzyme preparation have no significant effects on the performance,slaughter performance,immune organ index and muscle quality of meat ducks fed by cherry.Therefore,it is feasible to substitute sorghum for corn.