Effects Of Fermented Alfalfa Granuler Feed On The Production Performance Of Linwu Duck At The Late Growing Stage

This paper studied the effects of fermented alfalfa granular feed with different replacing proportions of the basal diet on the growth performance,carcass trait,organ index,serum biochemical parameter,development and physiological function of intestine in Linwu ducks.A total of 300 healthy 70-day-old female Linwu ducks with similar body weight were randomly divided into 5 groups with 6 replicates per group and 10 ducks per replicate.The experiment lasted for 35 days.Ducks in control group(0% group)were fed a basal diet,and ducks in treated groups Ⅰ to Ⅳ were fed the experimental diets which were basal diets supplemented with 5%(5% group),10%(10% group),15%(15% group)and 20%(20%group)fermented alfalfa granular feed,respectively.After the experiment,the blood and tissue samples of the experimental ducks were collected for analysis.The results were showed as followed:(1)There were no significant differences in growth performance,carcass trait and organ index among all groups(P > 0.05).The optimal average daily gain was obtained in the 5%group,and the highest average daily feed intake was obtained in the 20% group.The optimal carcass trait,half-eviscerated rate and fully eviscerated rate were obtained in the 15% group.The breast muscle rate and leg muscle rate in the 5%～20% groups were increased compared with the control group(P > 0.05).(2)Compared with the control group,the serum low density lipoprotein contents in the5%,15% and 20% groups were significantly decreased by 21.88%,19.27%,and 25.52%,respectively(P < 0.05).Compared with the control group,uric acid content in the 15%group was significantly increased(P < 0.05);the serum luteinizing hormone level in the 15%group was significantly increased(P < 0.05);and the serum luteinizing hormone level in the5%,10% and 20% groups were decreased,but the differences were not significant(P > 0.05).Serum luteinizing hormone level in the 15% group was significantly increased compared with that in the 5%,10% and 20% groups(P < 0.05).(3)Compared with the control group,the relative length of ileum in the 20% group was significantly increased(P < 0.05).There were no significant differences in the relative length of jejunum,cecum,total intestine,and the relative weight of duodenum,jejunum and cecum among the treated groups(P > 0.05).Compared with the control group,villus height/crypt depth in the 5% group was significantly increased(P < 0.05);villus height in ileum in the10% group was significantly increased(P < 0.05);villus height in jejunum and crypt depth in duodenum in the 15% group were significantly increased and decreased,respectively(P <0.05);villus heights in duodenum and ileum,villus height/crypt depth and gland length in cecum in the 20% group were significantly increased(P < 0.05).(4)Compared with the control group,the contents of Lactobacillus in cecum in the 5%,10% and 15% groups were significantly increased(P < 0.05).There were no significant differences in Bifidobacteria and Escherichia coli among the treated groups(P > 0.05).In conclusion,fermented alfalfa granular feed could significantly improve the digestive tract capability,reduce the blood lipid level of meat ducks,and promote the proliferation of beneficial bacteria in cecum,with no adverse effects on the growth performance,slaughter performance and organ index of Linwu ducks.Under the preset experimental conditions,using the serum biochemical index,cecum microorganisms,intestinal development and intestinal morphology as the evaluation parameters,we suggested that replacing the basal diets with 15% fermented alfalfa granular feed were optimal to feed female Linwu ducks aged 70 to 105 days.