中文摘要：

试验选用84头体重接近10kg杜洛克×长白×大约克（DLY）5-元杂交阉公猪，随机分成2组，组内设6个重复，每个重复7头猪。研究在NRC（1998）标准（对照组）、荣昌猪（GB7223—1987）饲养标准（试验组）两种饲粮条件下，营养水平对DLY生长肥育猪血液生化指标、背最长肌肌内脂肪（IMF）含量及LPLmRNA表达量的影响。结果表明：（1）对照组及试验组生长肥育猪血清中高密度脂蛋白胆固醇（HDL—C）含量、背最长肌肌内脂肪及LPLmRNA表达量含量随体重增加均呈上升趋势，35～80kg阶段血清游离脂肪酸（FFA）呈上升趋势，而后下降，而低密度脂蛋白胆固醇（LDL-C）与高密度脂蛋白胆固醇比值（LDL-C／HDL—c）呈下降趋势；（2）各阶段试验组背最长肌肌内脂肪含量均高于对照组，体重50kg时达到显著水平（P〈0．05）；体重110kg时，试验组背最长肌LPLmRNA表达量高于对照组（P〉0．05）；降低饲粮营养水平可降低35～110kg阶段血清胆固醇（TC）、HDL—C和FFA含量，降低了50～80kg阶段血清甘油三酯（TG）、LDL—c和极低密度脂蛋白胆固醇（VLDL—c）含量（P〉0．05）。

英文摘要：

Eighty four healthy Duroc×Landrace ×Yorkshire pigs（ 10 kg BW） were allocated to control（NRC, 1998） or treatment group （GB 7223-1987）,each group with 6 replicates,each including 7 pigs,when body weight （BW） reached 110 kg, triglyceride （TG）, total cholesterol （TC）, high-density lipoprotein-cholesterol （HDL-C）, low-density lipoprotein- cholesterol （LDL-C）, very low-density lipoprotein-cholesterol （VLDL-C） and free fatty acid （FFA） in serum, intramuscular fat （IMF） and lipoprotein lipase （LPL） mRNA in Longissimus Dorsi were determined.The results showed that： （1）The concentration of serum HDL-C ,IMF and LPL mRNA in Longissimus Dorsi of control and treatment were increased when body weight （BW） increased during growing-finishing period.The concentration of serum FFA was increased when body weight was 35 - 80 kg,and decreased then.But the ratio of serum LDL-C/HDL-C had a tendency of decline when BW increased. （2）IMF in Longissimus Dorsi of treatment was higher than that of control during growing-finishing period ,and it was significant when BW was 50 kg（P 〈 O.05）.LPL mRNA in Longissimus Dorsi of treatment was higher than that of control when BW was 110 kg （P 〉 0.05）.As dietary nutritional level declined serum TC,HDL-C and FFA were decreased when BW was 35 - 110 kg,and serum TG,LDL-C and VLDL-C were also reduced when BW was 50 - 80 kg（P 〉 0.05）.