本试验旨在研究饲粮烟酸添加水平对五龙鹅生长性能、屠宰性能及养分表观利用率的影响。选择1日龄五龙鹅360只，随机分为6个组，每组6个重复，每个重复10只鹅。Ⅰ组为对照组，饲喂基础饲粮（烟酸含量：1～4周龄为25．54 mg/kg，5～16周龄为23．48 mg/kg），试验组分别在基础饲粮中添加20、40、60、80、100 mg/kg的烟酸。试验期16周。结果表明：1）与对照组相比，饲粮添加60 mg/kg烟酸时，1～4周龄鹅料重比极显著降低（ P＜0．01），各组1～4周龄鹅平均日增重差异不显著（ P＞0．05）。与对照组相比，饲粮添加40 mg/kg烟酸显著和极显著降低5～8周龄、9～16周龄鹅料重比（P＜0．05和P＜0．01）。2）与对照组相比，饲粮添加60 mg/kg烟酸极显著提高4周龄鹅的屠宰率、半净膛率、全净膛率（ P＜0．01），各组4周龄鹅的腿肌率和胸肌率差异不显著（ P＞0．05）。饲粮添加60 mg/kg烟酸极显著提高了16周龄鹅的屠宰率、半净膛率、腿肌率、胸肌率（P＜0．01），显著提高了16周龄鹅的全净膛率（P＜0．05）。3）与对照组相比，饲粮添加60 mg/kg烟酸极显著提高了干物质、有机物、粗蛋白质、粗脂肪、钙、磷、中性洗涤纤维、酸性洗涤纤维的表观利用率（ P＜0．01）。综合考虑，1～4周龄、5～8周龄及9～16周龄五龙鹅适宜烟酸需要量分别为85．54、63．48、63．48 mg/kg。%This experiment was conducted to study the effects of dietary nicotinic acid supplemental level on growth performance,slaughter performance and nutrient apparent availability of Wulong geese. Three hundred and sixty one-day-old Wulong geese were selected and randomly divided into 6 groups with 6 replicates in each group and 10 geese in each replicate. Geese in the control group( group Ⅰ)were fed a basal diet( nicotinic acid content:1 to 4 weeks of age was 25.54 mg/kg;5 to 16 weeks of age was 23.48 mg/kg),and geese in the other experiment groups( groupsⅡtoⅥ)were fed the basal diets supplemented with 20,40,60,80 and 100 mg/kg nicotinic acid,respectively. The experiment lasted for 16 weeks. The results showed as follows:1) compared with the control group,1 to 4 weeks of age,the supplementation of 60 mg/kg nicotinic acid signifi-cantly decreased the ratio of feed to gain( F/G)( P<0.01),but there was no significant difference in average daily gain among all groups( P>0.05). Compared with the control group,5 to 8 weeks and 9 to 16 weeks of age,the supplementation of 40 mg/kg nicotinic acid significantly decreased F/G( P<0.05 and P<0.01). 2) Compared with the control group,the supplementation of 60 mg/kg nicotinic acid significantly increased dress-ing percentage,percentage of half-eviscerated weight,percentage of eviscerated weight of geese at 4 weeks of age( P<0.01),but there were no significant differences in percentage of leg muscle and percentage of breast muscle among all groups( P>0.05). The supplementation of 60 mg/kg nicotinic acid significantly increased dressing percentage,percentage of half-eviscerated weight,percentage of leg muscle of geese and percentage of breast muscle at 16 weeks of age( P<0.01),and significantly increased percentage of eviscerated weight of geese at 16 weeks of age( P<0.05). 3)Compared with the control group,the supplementation of 60 mg/kg nicotinic acid significantly increased the apparent availability of dry matter,organic matter,crude protein,e-ther extract,calcium,phosphorus,neutral detergent fiber and acid detergent fiber( P<0.01). In conclusion, the nicotinic acid requirement of Wulong geese at 1 to 4 weeks of age is 85.54 mg/kg;that of 5 to 8 weeks of age is 63.48 mg/kg;and that of 9 to 16 weeks of age is 63.48 mg/kg.
展开▼
