Effects of dietary particle size and fiber source on nutrient digestibility and short chain fatty acid production in cannulated growing pigs
Effects of dietary particle size and fiber source on nutrient digestibility and short chain fatty acid production in cannulated growing pigs
复制标题
日粮粒度和纤维来源对插管生长猪营养物质消化率和短链脂肪酸产量的影响
DOI：
10.1016/j.anifeedsci.2019.114310
复制
发表时间：
2019-12-01
影响因子：
3.2
通讯作者：
Zhang, S.
中科院分区：
文献类型：
--
作者：
Zhao, J. B.;Zhang, G.;Zhang, S.
本研究旨在探讨不同颗粒度和纤维来源对猪不同肠段营养物质消化率和短链脂肪酸（SCFA）含量的影响。试验选用18头回肠末端有T形插管的成年公公猪，随机分为3组，每组10头，按3 × 2析因设计，分别饲喂玉米麸皮、甜菜浆和大豆皮3种高纤维日粮和2种不同粒度的饲料。试验分为2个阶段，每个阶段15 d，其中适应期10 d，粪便收集期3 d，回肠收集期2 d。结果表明，粗饲粮显著降低了能量（GE）、干物质（DM）、有机物（OM）、总膳食纤维（TDF）和不溶性膳食纤维（IDF）的回肠表观消化率（AID）（P < 0.05），但有增加后肠GE消失率（P < 0.10）的趋势。饲料颗粒大小对饲粮中除乙醚浸出物（EE）、氨基酸（AA）的表观全消化道消化率（ATTD）和回肠末端SCFA浓度外，其余营养物质的表观全消化道消化率（ATTD）均无显著影响，而纤维源对饲粮中大多数营养物质的表观全消化道消化率、ATTD和后肠消失率以及粪便SCFA浓度有显著影响（P < 0.05）。颗粒大小和纤维来源对后肠纤维组分的消失有交互作用（P < 0.05）。粗CB日粮显著（P < 0.05）增加了TDF、可溶性膳食纤维（SDF）、IDF、中性洗涤纤维（aNDF）、酸性洗涤纤维（ADF）和纤维素的后肠消失率，但不同粒径的SBP和SH对TDF、ADF和纤维素的后肠消失率无影响。结果表明，颗粒大小主要影响猪对营养物质和纤维组分的回肠消化率，而对全胃肠道消化率影响不大，且影响程度因膳食纤维来源不同而异。
The objective of this study was to evaluate the effects of different feed particle sizes and fiber sources on nutrient digestibility and short chain fatty acids (SCFA) concentration in different intestinal segments of pigs. Eighteen barrows with T-cannula in the distal ileum were randomly allotted to a 3 x 2 factorial arrangement with 3 different high-fiber diets including corn bran (CB), sugar beet pulp (SBP) and soybean hulls (SH), and 2 different feed particle sizes. The experiment contained 2 periods, and each period lasted for 15 days, including 10 days for diets adaptation, 3 days for fecal collection, and 2 days for ileal digesta collection. The results indicated that coarse diets decreased (P < 0.05) the apparent ileal digestibility (AID) of gross energy (GE), dry matter (DM), organic matter (OM), total dietary fiber (TDF) and insoluble dietary fiber (IDF), but tended to increase (P < 0.10) the hindgut disappearance of GE. Feed particle sizes did not affect the apparent total tract digestibility (ATTD) of dietary nutrients except for ether extract (EE), the AID of amino acid (AA) and SCFA concentrations in ileal digesta, but fiber sources had significant effects on (P < 0.05) the AID, ATTD and hindgut disappearance of most nutrients in diets and the fecal SCFA concentrations. Moreover, there were interactive effects (P < 0.05) between particle sizes and fiber sources on the hindgut disappearance of fiber fractions. Coarse CB diets increased (P < 0.05) the hindgut disappearance of TDF, soluble dietary fiber (SDF), IDF, neutral detergent fiber (aNDF), acid detergent fiber (ADF) and cellulose, but the different particle size of SBP and SH did not affect the hindgut disappearance of TDF, ADF and cellulose. In conclusion, particle size mainly affected the ileal digestibility of nutrients and fiber fractions in pigs, but had few effects on their whole gastrointestinal digestibility, and these influences varied among different dietary fiber sources.