摘要
本试验旨在研究日粮中添加脂肪对断奶至2月龄肉兔生长发育、能量和蛋白利用、十二指肠酶活、血液生化指标及盲肠发酵的影响。选用112只断奶新西兰兔,随机分成7组,每组16只,分别饲喂添加不同种类(猪油、豆油)和水平(0%、2%、4%和6%)油脂的日粮。结果表明:日粮中添加油脂能显著提高肉兔日增重和饲料转化效率(P<0.05),添加4%油脂时平均日增重最高为29.33 g,料重比最低为3.31∶1;能量消化率和代谢率随油脂添加水平的提高而显著提高(P<0.05);氮沉积和可消化氮转化为沉积氮的效率随油脂添加水平的提高先增加后降低,以4%油脂添加量最高,分别为0.81 g/d和58.70%;添加油脂显著提高了十二指肠脂肪酶活性(P<0.05),4%添加量时酶活最高为224.01 IU/g;和添加豆油相比,添加猪油显著提高了血液总胆固醇(TC)、总甘油三酯(TG)和高密度脂蛋白(HDL)含量(P<0.05);添加油脂对盲肠pH、NH3-N浓度、挥发性脂肪酸中乙酸、丙酸、丁酸比例及乙丙酸比例影响不显著(P>0.05)。综合以上结果,断奶至2月龄肉兔脂肪的适宜添加量为4%。
An experiment was conducted to determine the effects of different diet fat supplement on growth performance, nutrient utilization, caecum fermentation, digestive enzyme activity in duodenum and blood parameters of 112 New Zealand meat rabbits from weaning to two-month old. One hundred and twelve weaned rabbits were allocated in individual cage for seven treatments in which they were fed diets with addition of fat at different types （lard and soybean oil） and levels （0%. 2%. 4% and 6%）. The results showed that the average daily gain （ADG） and feed conversion rate （FCR） were increased when the level of dietary fat ascended （P〈0.05）, ADG was the highest and FCR was the lowest when the fat level was 4%. which were 29.33 g and 3.31 ： 1. The energy digestibility and metabolizability were ascended when the dietary fat addition increased （P〈0.05）. The retained nitrogen （N） and the efficiency of digestible N converted into retained N increased and then decreased with the increase of additive fat and reached their maximum （0.81 g/d and 58.70%） when adding 4% fat. The lipase activity of duodenum was significantly affected by fat addition （P 〈0.05） and reached the maximum （224.01 IU/g） when addiing 4% fat. Contrast to soybean oil groups, the concentration of total cholesterol （TC）, triglyceridese （TG） and high density lipoprotein （HDL） in serum of groups added lard were higher （P〈0.05）. The fat addition did not affect the caecum fermentation. Based on above results, the appropriate fat addition was 4% for rabbits from weaning to two-month old. [Chinese Journal of Animal Nutrition, 2006,18（3） ： 179-185 -]
出处
《动物营养学报》
CAS
CSCD
北大核心
2006年第3期179-185,共7页
CHINESE JOURNAL OF ANIMAL NUTRITION
基金
山东省科技厅项目(20001050101)
关键词
新西兰兔
油脂
生产性能
氮平衡
盲肠发酵
New Zealand rabbits
Fat
Growth performance
N balance
Caecum fermentation
作者简介
陈萍（1978-）．女，山东诸城人，在读博士，主要从事反刍动物营养研究。E-mail：chenping0318@126．com
通讯作者：李福昌，教授，博士生导师。E—mail：chlf@sdau．edu．cn
