摘要
旨在研究不同填饲量对北京鸭胴体品质、体脂沉积及营养物质表观消化率的影响。选取35日龄健康、大小均匀的W系雄性北京鸭96只,随机分成8个处理,每处理6个重复,每个重复2只鸭。基础日粮中加入0.5%的Cr2O3作为外源指示剂测定填鸭营养物质表观消化率,对照组自由采食,试验组在35和36日龄时分别填饲260和300g.d-1的基础日粮,之后5d各处理填饲量保持不变,分别为300、330、360、390、420、450、480g.d-1,试验期为7d。结果表明:(1)不同填饲量对北京鸭屠体率、全净膛率、胸肌率、腿肌质量和腿肌率影响不大(P>0.05),而对北京鸭胸肌质量影响显著(P<0.05),并随填饲量的增加呈现先升高后平稳的趋势,以胸肌质量为评定指标,采用直线折线模型进行估算的最适填饲量为390.7g.d-1。不同填饲量对北京鸭皮脂质量、皮脂率、腹脂质量、腹脂率、肝脏质量、肝重率和肝脂率均有显著的影响(P<0.05),但填饲量增加到一定值后,体脂沉积量保持稳定(P>0.05);(2)在填饲期,不同填饲量对北京鸭干物质和粗蛋白表观消化率影响显著(P<0.05),而对能量表观消化率影响不大(P>0.05)。以上结果表明,填饲能够快速增加北京鸭的体脂沉积,对胸肌生长发育影响显著,但随填饲量的增加,营养物质表观消化率下降,填鸭体脂沉积量不再增加。
This experiment was conducted to determine the effects of different force-feeding levels on carcass quality,body fat deposition and apparent digestibility of nutrients for Pekin ducks.Ninety-six 35-day-old health male Pekin ducks with similar pen weight were randomly assigned into 8 treatments with 6 replicates per treatment and 2 Pekin ducks per replicate.Apparent digestibility of nutrients was determined with chromic oxide（Cr2O3） at an inclusion rate of 0.5% in basal diet.The experimental feeding period lasted 7 d from 35 to 42 d of age and the corn-soybean diet was fed to the eight groups of ducks,the control group by ad libitum-feeding and the experimental groups by force-feeding.The force-fed intake was 260 g·d-1 at 35 d of age and increased to 300 g·d-1 at 36 d of age.The force-fed intake unchanged during the other five days and they were 300,330,360,390,420,450 and 480 g·d-1 each treatments,respectively.The results showed as follows：（1）No significant differences in dressing percentage（DP）,eviscerated percentage（EP）,breast muscle percentage（BMP）,leg muscle weight（LMW） and leg muscle percentage（LMP）were observed among treatments（P〉0.05）.Breast muscle weight（BMW） increased with increasing feeding level from the control group to 390 g·d-1（P〈0.05） and then decreased（P〉0.05）.Based on the broken-line regression model analysis with BMW data,the optimum feeding levels for force-feeding Pekin ducks was 390.7 g·d-1;These were significant differences among treatments in body fat deposition index（P〈0.05）.But body fat deposition were unchange when force-feeding levels reached a certain value（P〉0.05）.（2）For the final overfeeding period,there were significant differences in apparent digestibility of dry matter and crude protein（P〈0.05）,whereas apparent digestibility of energy had no significant differences（P〉0.05） between different treatments.In conclusion,overfeeding of Pekin ducks can induces a strong fattening of subcutaneous adipose tissues and muscles and force-feeding has a significant effect on breast muscle growth.However,nutrients digestibility decrease and body fat deposition keep unchange with increasing force-feeding levels.
出处
《畜牧兽医学报》
CAS
CSCD
北大核心
2012年第8期1247-1254,共8页
ACTA VETERINARIA ET ZOOTECHNICA SINICA
基金
现代水禽产业技术体系建设专项资金资助(CARS-43)
科技人员服务企业行动项目(2009GJA00003)
关键词
北京鸭
填饲
体脂沉积
胴体品质
营养物质消化率
Pekin ducks
force-feeding
body fat deposition
carcass quality
nutrients digestibility
