饲粮类型和磷水平对生长猪后肠磷消化率的影响

摘要

The present study was conducted to investigate the effects of dietary type and phosphorus ( P) level on the post-ileal P digestibility and digestible P content for growing pigs. Thirty-two barrows with average body weight of (34.1±1.2) kg fitted with T-cannula were used in a randomized complete block design with a 2×2 factorial arrangement of 4 treatment, there were 8 replicates per treatment with 1 pig per replicate. The corn-soybean meal ( CSBM) and wheat-soybean meal ( WSBM) diets supplemented with or without inorganic were used to study the effects of dietary type and P level on the estimation of ileal and post-ileal digestibility of P for growing pigs. The results showed that pigs fed the WSBM diet had greater ileal and fecal P output than pigs fed the CSBM diet ( P<0.01) . Therefore, ileal digestible P, total tract digestible P, apparent ileal P digestibility and apparent total tract P digestibility were greater in the WSBM diet than that in the CSBM diet (P<0.01). Regardless of diet type, dietary inorganic P supplementation significantly increased dietary total P intake, ileal P output, ileal digestible P, total tract digestible P, apparent ileal and total tract digestibility of P (P<0.01). There were no influences of diet type and dietary P level on post-ileal digestible P and apparent post-ileal P di-gestibility ( P>0.05 ) . The differences between apparent ileal and total tract P digestibility were 9. 69%, 6.79%, 9.36% and 10.53% for pigs fed the CSBM diet at low P level, the CSBM diet at high P level, the WSBM diet at low P level and the WSBM diet at high P level, respectively ( P<0.05) . In conclusion, there is a minimal amount of post-ileal digestible P for growing pigs. However, the amount of post-ileal digestible P and post-ileal P digestibility are not affected by diet type and dietary P level.%本试验旨在研究饲粮类型和磷水平对生长猪后肠磷消化率和可消化磷含量的影响。选用32头平均体重为(34.1±1.2) kg安装了简单T型瘘管的生长公猪，采用2×2因子完全随机区组设计分为4个处理，每个处理8个重复，每个重复1头猪。以玉米-豆粕型和小麦-豆粕型饲粮作为基础饲粮，通过添加磷酸氢钙提高饲粮总磷水平，研究其对生长猪后肠磷消化率的影响。结果表明：小麦-豆粕型饲粮组的回肠食糜磷排泄量和粪磷排泄量显著低于玉米-豆粕型饲粮组( P<0.01)，从而增加了回肠可消化磷和全肠道可消化磷含量以及磷的表观回肠消化率和全肠道消化率( P<0.01)。通过添加磷酸氢钙增加饲粮磷含量，可显著提高采食玉米-豆粕型和小麦-豆粕型饲粮生长猪的总磷摄入量、回肠食糜磷排泄量、回肠可消化磷和全肠道可消化磷含量以及磷的表观回肠消化率和全肠道消化率(P<0.01)。后肠可消化磷和磷的表观后肠消化率不受饲粮类型和磷水平的影响( P>0.05)。玉米-豆粕型饲粮低磷组、玉米-豆粕型饲粮高磷组、小麦-豆粕型饲粮低磷组和小麦-豆粕型饲粮高磷组磷的表观全肠道消化率比磷的表观回肠消化率分别高9.69%、6.79%、9.36%和10.53%( P<0.05)。由此可见，生长猪后肠存在磷的消化吸收，但其消化吸收能力有限，且不受饲粮类型和磷水平的影响。