关键词: 纤维源，生长猪，生长性能，胴体性状，肉品质，血清生化指标，养分消化率

Abstract: Abstract:【Objective】This study aimed to investigate the effects of short-term feeding of 20% different fibrous sources on the growth performance, carcass traits, meat quality and nutrient digestibility of growing pigs. 【Method】A total of 27 healthy Duroc × Landrace × Yorkshire（DLY） growing pigs (37.91±1.95 kg) were randomly allotted to 5 groups according to the principle of no difference in body weight. Of those, pigs in control group (CON, 6 replicates) were fed with basal diets, while pigs in the other four groups were fed with 20% wheat bran (WB, 6 replicates), soybean fiber(SF, 5 replicates), pea fiber (PF, 5 replicates) and oat bran fiber (OF, 5 replicates) supplemented diet, respectively. 【Results】The results showed as follows: 1) Compared with CON group, the finial weight (P<0.05) and ADFI (P<0.01) of pigs in SF group showed significantly decreased, with a decreased trend (P=0.08) of ADG. The ADGI of pigs in PF group was also significantly reduced (P<0.05). 2) No significant differences on the carcass weight, dressing percentage, carcass length and eye muscle area of pigs were observed among the four fiber-supplemented groups (P>0.05). But the average back fat thickness of pigs in PF and OF groups showed significantly lower than that of CON group (P<0.05). 3) No significant differences on the red value (a*), brightness value (L*), pH24h, drip loss and cooking loss of longissimus muscle were observed among the four fiber-supplemented groups (P>0.05). Compared with CON group, the marbling score of longissimus muscle in WB (P<0.01) and SF group (P<0.05) was significantly decreased, and showed a decreased trend in PF group (P=0.053). In addition, pH45min and shear force of longissimus muscle of pigs in OF group, as well as the yellow value (b*) of WB group was significant decreased (P<0.05). 4) No significant differences on the low-density lipoprotein cholesterol and total cholesterol in the serum of pigs were observed among the four fiber-supplemented groups (P>0.05). Compared with CON, the concentration of apolipoprotein B was found significantly increased in PF (P<0.05) and OF group (P<0.01), respectively. The serum high-density lipoprotein cholesterol of pigs in PF group was also significantly increased (P<0.05). 5) Compared with CON group, the digestibility ofgross energy(GE)，dry matter (DM)，ether extract (EE)，acid detergent fiber (ADF) and neutral detergent fiber (NDF) was significantly higher in WB and OB group (P<0.05), while the digestibility of EE, crude fiber (CF), ADF and NDF was higher in SF and PF group (P<0.05). Additionally, compared with WB and OB group, the digestibility of ADF of SF and PF group showed significantly increased, with a significantly decrease of the digestibility GE，crude protein (CP)，EE and NDF (P<0.05). 【Conclusions】The short-term feeding of 20% dietary wheat bran, pea fiber and oat bran fiber may not remarkably affect the growth performance and carcass traits of growing pigs. On the other hand, the supplement of 20% dietary soybean fiber may probably decrease the growth performance of pigs. Changes in meat quality data may be related to the body lipid transport and metabolism induced by dietary fiber. Nevertheless, a short-term feeding of 20% fibrous sources can improve the nutrient digestibility of growing pigs, and wheat like bran may present a better effect than that of legumes fibers.

Key words: Fibrous sources, Growing pigs, Growth performance, Carcass traits, Meat quality, Serum biochemical index, Nutrient digestibility