日粮能量水平对断奶至3月龄獭兔生长发育、消化代谢、血液生化和盲肠发酵的影响

Effects of Dietary Energy Levels on Growth Performance,Nutrient Metabolism, Biochemical Parameters and Caecum Fermentation of Rex Rabbits from Weaning to 3-month-old

本研究旨在探讨日粮不同能量水平对断奶至3月龄獭兔生长性能、营养物质消化代谢、血液生化参数和盲肠发酵的影响。选用断奶獭兔200只,随机分成5组,每组40个重复,饲喂5种不同消化能水平的日粮(9.46、9.97、10.46、10.94、11.43MJ.kg-1),预试期7d,正试期53d。通过动物饲养试验、消化代谢试验和屠宰试验对獭兔的各项指标进行研究。结果表明,在初始体质量无显著差异的情况下,平均日采食量随日粮消化能水平的提高极显著降低(P<0.01),日粮能量水平对料重比影响显著(P<0.05),其中10.46MJ.kg-1组最小;随日粮消化能水平的增加,食入氮极显著降低(P<0.01),粪氮排出显著降低(P<0.05);日粮能量水平对DE/GE和ME/GE影响显著(P<0.05),其中10.46MJ.kg-1组的DE/GE和ME/GE最高;日粮能量水平对血清中胰岛素浓度影响显著(P<0.05);盲肠氨氮浓度和丙酸比例随日粮能量水平的增加而显著增加(P<0.01或P<0.05),乙酸比例和乙丙酸比随日粮能量水平的增加而显著降低(P<0.01或P<0.05)。本试验结果表明,断奶至3月龄獭兔的适宜日粮消化能水平为10.46MJ.kg-1。

The experiment was conducted to investigate the effects of energy levels on growth performance,nutrient metabolism,biochemical parameters and caecum fermentation of Rex Rabbits from weaning to 3-month-old.Two hundred weaned Rex Rabbits（similar BW） were randomly divided into 5 treatments（40 replicates per treatment,1 rabbit per replicate）： feeding diets containing DE 9.46,9.97,10.46,10.94 and 11.43 MJ·kg-1,respectively.The trial lasted for 7 days for adaptation,and 53 days for test,respectively.By animal breeding experiment,digestibility experiment and slaughtering experiment,indexes were determined.The results showed that,the daily feed intake（ADI）（P〈0.01）,feed gain（F/G）（P〈0.05） were decreased with the increase of DE levels,and the feed efficiency of 10.46 MJ·kg-1 group was better than that of other treatments.As the increasing DE levels,the nitrogen intake（IN） and fecal nitrogen（FN） were significantly reduced（P〈0.01 or P〈0.05）.DE/GE and ME/GE were also affected by DE levels（P〈0.05）,and DE/GE and ME/GE reached to the maximum in 10.46 MJ·kg-1 treatment.DE levels could affect the insulin concentration in blood serum（P〈0.05）.NH3-N concentration and propionic acid ratio of caecum were increased（P〈0.01 or P〈0.05） in high DE levels,but the acetic acid percentage and acetic acid to propionic acid percentage had the contrary tendency（P〈0.01 or P〈0.05）.In conclusion,the suitable DE level was 10.46 MJ·kg-1 for Rex Rabbits from weaning to 3-month-old.