Effects of dietary n -6/ n -3 polyunsaturated fatty acids ratio on growth performance, apparent digestibility, blood lipid profiles, fecal microbiota, and meat quality in finishing pigs

[摘要] The effects of dietary omega-6 ( n -6) to omega-3 ( n -3) polyunsaturated fatty acid (PUFA) ratios on growth performance, digestibility, blood lipid profiles, fecal microbial counts, and meat quality in finishing pigs were examined by using linseed and fish oil. A total of 140 crossbred finishing pigs [(Landrace × Yorkshire) × Duroc] were used in a 10 wk trial. Pigs were blocked based on body weight (BW) and sex and randomly allotted to four dietary treatments formulated to have n -6/ n -3 ratios of 5/1, 10/1, 15/1, and 17/1 (control). Throughout the experiment, BW, average daily gain, and average daily feed intake were significantly ( P  < 0.05) increased with a decreased ratio of n -6/ n -3 PUFA. Energy digestibility and fecal Lactobacillus count showed a linear ( P  < 0.05) increase in week 10. The high-density lipoprotein cholesterol and blood triglyceride concentrations increased ( P  < 0.1) during week 10. However, low-density lipoprotein cholesterol was reduced ( P  < 0.05) linearly during week 5 and week 10 with a reduction in dietary n -6/ n -3 ratio. This study provides a basis for future research on altering n -6/ n -3 ratio by using linseed oil and refined fish oil in finishing pigs.

[学科分类] 动物科学