本研究通过2个试验探讨了饲粮纤维素添加水平对生长猪内源磷损失(EPL)和玉米-豆粕型饲粮中磷的标准回肠消化率(SID)、标准全肠道消化率(STTD)的影响。选用28头回肠末端安装了简单T型瘘管、平均体重为(25.1±2.0) kg的生长猪,按完全随机试验设计,分为4个组,每组7个重复,每个重复1头猪,试验1饲喂4个纤维素添加水平分别为0(对照)、3%、6%和9%的无磷饲粮。试验2饲喂4个纤维素添加水平分别为0(对照)、3%、6%和9%的玉米-豆粕型饲粮。2个试验均包括5 d的预试期、2 d的粪样收集期(第6天和第7天)和2 d的食糜收集期(第8天和第9天)。以三氧化二铬作为指示剂测定生长猪EPL和磷的消化率。结果表明,生长猪全肠道EPL随饲粮纤维素添加水平提高而线性降低(P<0.05);磷的表观回肠消化率(AID)、SID和STTD也随饲粮纤维素添加水平提高而线性降低(P<0.05或P<0.01)。根据以上结果,在本试验条件下,猪对无磷饲粮纤维素的适宜添加水平为3%~6%,而玉米-豆粕型饲粮建议不添加纤维素;饲粮纤维素添加水平显著影响生长猪EPL和玉米-豆粕型饲粮中磷消化率的测定。
Two experiments were conducted in this study to investigate the effects of dietary fiber supplemented level from purified cellulose on the estimation of endogenous phosphorus (P) loss (EPL), and standardized ileal digestibility (SID) and standardized total tract digestibility (STTD) of P in corn-soybean meal diets for growing pigs. Twenty-eight growing pigs with initial body weight of (25.1±2.0) kg were surgically fitted with simple T-cannulas at the distal ileum. According to a completely randomized design, the pigs were assigned to 4 groups with 7 replicates in each group and 1 pig in each replicate. In experiment 1, four groups were assigned to P-free diets containing 4 levels of purified cellulose supplementation [0 (control), 3%, 6% and 9%]. In experiment 2, four groups were assigned to corn-soybean meal diets containing 4 levels of purified cellulose supplementation [0 (control), 3%, 6% and 9%]. In two experiments, the experimental period consisted of a 5 days pre-test period, 2 days for feces collection on days 6 and 7, and 2 days for ileal digesta collection on days 8 and 9. Chromic oxide was included in diets to determine basal EPL and apparent digestibility of P. The results showed that the estimates of basal EPL for total tract of pigs was linearly decreased with dietary fiber supplemented level from purified cellulose (P<0.05). The apparent ileal digestibility (AID), SID and STTD of P in diets were linearly decreased with increasing fiber supplemented level (P<0.05 or P<0.01). In conclusion, under the condition of this experiment, the suitable addition level of cellulose is 3% to 6% in P-free diets for growing pigs, and no add recommend for the corn-soybean meal diet. Dietary fiber supplemented level significantly influence the determination of EPL for growing pigs, and P digestibility in corn-soybean meal diets.
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