Duration of dietary linseed feeding affects the intramuscular fat, muscle mass and fatty acid composition in pig muscle
Duration of dietary linseed feeding affects the intramuscular fat, muscle mass and fatty acid composition in pig muscle
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DOI：
10.1016/j.livsci.2008.01.002
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发表时间：
2008-10-01
影响因子：
1.8
通讯作者：
Peng, J.
中科院分区：
文献类型：
--
作者：
Huang, F. R.;Zhan, Z. P.;Peng, J.
本研究旨在探讨饲粮中添加亚麻籽对生长肥育公猪皮下脂肪、肌内脂肪和肌肉质量的影响。配制两种等能等氮日粮，一种为基础日粮，另一种为含10%亚麻籽的亚麻籽日粮。将24头体重为35 +/- 3.7 kg的长白猪×约克郡公猪随机分配至4个处理组，每个处理组6个重复。处理1（T1）中的猪在整个实验期间饲喂对照饮食，而T2、T3和T4中的猪除了屠宰前30、60和90 d饲喂亚麻籽饮食外均饲喂对照饮食。试验进行了90 d。收集和分析胴体品质和肉质数据。称取背最长肌、背小肌及后腿各肌群的重量。此外，采用气相色谱法分析了日粮、背最长肌和背膘的脂肪酸组成（%）。随着饲喂时间的延长，平均背膘厚、瘦肉率、腰肌面积差异不显著（P > 0.05），肌内脂肪含量呈线性增加（P < 0.01）。随着饲喂亚麻籽日粮时间的延长，背最长肌、股四头肌和半腱肌质量呈线性增加（P < 0.01）。饲喂亚麻籽日粮的时间线性增加（P < 0.01）背膘和背最长肌中C18：3 n-3、C20：5 n-3和C22：5 n-3的浓度。肌内脂肪含量与n-3多不饱和脂肪酸（PUFA）含量呈显著的二次曲线关系（R-2=0.87，P
The aim of the study was to investigate the effect of duration of dietary linseed feeding on subcutaneous fat, intramuscular fat depot and muscle mass of growing-finishing barrows. Two isoenergetic and isonitrogenous diets were formulated, and one of which was the basal diet and another one was the linseed diet including linseed at the level of 10%. Twenty-four Landrace x Yorkshire barrows weighing 35 +/- 3.7 kg were randomly assigned to four treatments with six replications per treatment. Pigs in treatment 1 (T1) fed the control diet throughout the experimental period, while pigs in T2, T3, and T4 fed the control diet except for 30, 60, and 90 d prior to slaughter when the linseed diet were fed. The experiment was conducted for 90 d. Carcass quality and meat quality data were collected and analyzed. The longissimus muscle mass, posas minor mass and each muscle mass in the hind leg were weighted. Additionally, fatty acid composition (%) of the diet, the longissimus dorsi muscle and the backfat were analyzed by gas chromatography method. No significant difference (P > 0.05) was observed for average backfat thickness, lean meat percentage, loin muscle area, whereas the intramuscular fat content increased linearly (P < 0.01) as prolonged the time of feeding linseed diet. As prolonged the time of feeding linseed diet, the longissimus dorsi muscle mass, quadriceps femoris muscle mass and semitendinosus muscle mass increased linearly (P < 0.01). Duration of feeding linseed diet linearly increased (P < 0.01) the C18:3n-3, C20:5n-3 and C22:5n-3 concentrations in the longissimus muscle and backfat. There was significant quadratic relation between the intramuscular fat content and the n-3 polyunsaturated fatty acids (PUFA) enrichment (R-2=0.87, P