Effects of corn substitution by sorghum with different grain sizes on feed processing characteristics and growth performance of fattening pigs
To investigate the effects of sorghum with different grain sizes replacing corn on feed processing characteristics and growth performance of fattening pigs.A total of 120 healthy Duroc×Landrace×large hybrid fattening pigs with similar body weight were randomly divided into 6 groups,namely control group(basal diet)and experimental group(100%corn replaced by sorghum),with screen size:(1.5/2.0 mm,2.0/2.0 mm,2.0/2.5 mm,2.5/2.5 mm,2.5/2.5 mm,2.5/3.0 mm).There were 5 replicates in each group and 4 pigs in each replicate(50%male and 50%female).The pigs were fed in mixed breeding for 90 days.The results showed that,with the increase of screen size,the geometric mean particle size and particle hardness of feed increase,and the durability of feed decreases.There were significant differences among other groups(P＜0.05)except that there was no significant difference among individual groups(P＞0.05).The final weight[(122.76±7.14)kg]and average daily gain[(0.84±0.06)kg]in 2.5/2.5 mm group were the highest,and there were significant differences compared with other groups(P＜0.05);With the increase of sieve size,the apparent digestibility of porcine nutrient dry matter decreased with the exception of 2.5/2.5 mm group.There were significant differences between control group and 2.0/2.0 mm group(P＞0.05),but there were significant differences between other groups(P＜0.05);The apparent digestibility of pig nutrient crude protein changed irregularly with the increase of sieve size.Conclusion:Replacing corn with sorghum has a significant effect on feed processing characteristics,but no significant effect on growth performance of fattening pigs.With the increase of grain size of sorghum,feed processing characteristics and growth performance of fattening pigs have significant changes.Among them,the growth performance of pigs in 2.5/2.5 mm group[geometric mean particle size:(360.02±3.28)m]was better.
different granularitya surnamecornfeed processing characteristicsgrowth performance of fat pigs
NETL
NSTL
万方数据
维普
