Yang H, Li A K, Yin Y L, Li T J, Wang Z R, Wu G, Huang R L, Kong X F, Yang C B, Kang P, Deng J, Wang S X, Tan B E, Hu Q, Xing F F, Wu X, He Q H, Yao K, Liu Z J, Tang Z R, Yin F G, Deng Z Y, Xie M Y, Fan M Z
Department of Food Science and Engineering, Nanchang University, Nanchan, Jiangxie 330047, China.
Animal. 2007 Mar;1(2):213-20. doi: 10.1017/S1751731107257945.
The objectives of this study were to determine true phosphorus (P) digestibility, degradability of phytate-P complex and the endogenous P outputs associated with brown rice feeding in weanling pigs by using the simple linear regression analysis technique. Six barrows with an average initial body weight of 12.5 kg were fitted with a T-cannula and fed six diets according to a 6 × 6 Latin-square design. Six maize starch-based diets, containing six levels of P at 0.80, 1.36, 1.93, 2.49, 3.04, and 3.61 g/kg per kg dry-matter (DM) intake (DMI), were formulated with brown rice. Each experimental period lasted 10 days. After a 7-day adaptation, all faecal samples were collected on days 8 and 9. Ileal digesta samples were collected for a total of 24 h on day 10. The apparent ileal and faecal P digestibility values of brown rice were affected ( P < 0.01) by the P contents in the assay diets. The apparent ileal and faecal P digestibility values increased from - 48.0 to 36.7% and from - 35.6 to 40.0%, respectively, as P content increased from 0.80 to 3.61 g/kg DMI. Linear relationships ( P < 0.05), expressed as g/kg DMI, between the apparent ileal and faecal digestible P and dietary levels of P, suggested that true P digestibility and the endogenous P outputs associated with brown rice feeding could be determined by using the simple regression analysis technique. There were no differences ( P>0.05) in true P digestibility values (57.7 ± 5.4 v. 58.2 ± 5.9%), phytate P degradability (76.4 ± 6.7 v. 79.0 ± 4.4%) and the endogenous P outputs (0.812 ± 0..096 v. 0.725 ± 0.083 g/kg DMI) between the ileal and the faecal levels. The endogenous faecal P output represented 14 and 25% of the National Research Council (1998) recommended daily total and available P requirements in the weanling pig, respectively. About 58% of the total P in brown rice could be digested and absorbed by the weanling pig. Our results suggest that the large intestine of the weanling pigs does not play a significant role in the digestion of P in brown rice. Diet formulation on the basis of total or apparent P digestibility with brown rice may lead to P overfeeding and excessive P excretion in pigs.
本研究的目的是通过简单线性回归分析技术，测定断奶仔猪采食糙米时的真磷（P）消化率、植酸磷复合物的降解率以及内源性磷排出量。选用6头平均初始体重为12.5 kg的公猪，安装T型套管，并按照6×6拉丁方设计饲喂6种日粮。用糙米配制6种以玉米淀粉为基础的日粮，每千克干物质摄入量（DMI）中磷含量分别为0.80、1.36、1.93、2.49、3.04和3.61 g/kg。每个试验期持续10天。经过7天的适应期后，在第8天和第9天收集所有粪便样本。在第10天收集回肠食糜样本共24小时。试验日粮中的磷含量影响糙米的表观回肠和粪便磷消化率值（P<0.01）。随着磷含量从0.80 g/kg DMI增加到3.61 g/kg DMI，表观回肠和粪便磷消化率值分别从-48.0%增加到36.7%和从-35.6%增加到40.0%。表观回肠和粪便可消化磷与日粮磷水平之间呈线性关系（P<0.05，以g/kg DMI表示），这表明可以通过简单回归分析技术测定真磷消化率以及与糙米采食相关的内源性磷排出量。回肠和粪便水平的真磷消化率值（57.7±5.4对58.2±5.9%）、植酸磷降解率（76.4±6.7对79.0±4.4%）和内源性磷排出量（0.812±0.096对0.725±0.083 g/kg DMI）没有差异（P>0.05）。内源性粪便磷排出量分别占美国国家研究委员会（1998年）推荐的断奶仔猪每日总磷和有效磷需求量的14%和25%。糙米中约58%的总磷可被断奶仔猪消化吸收。我们的研究结果表明，断奶仔猪的大肠在糙米磷消化中不起重要作用。基于糙米总磷或表观磷消化率的日粮配方可能导致猪的磷过量采食和过量磷排泄。
