Effect of feed intake level on the determination of apparent and standardized total tract digestibility of phosphorus for growing pigs
Effect of feed intake level on the determination of apparent and standardized total tract digestibility of phosphorus for growing pigs
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DOI：
10.1016/j.anifeedsci.2018.10.012
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发表时间：
2018-12-01
影响因子：
3.2
通讯作者：
Zhang, H. F.
中科院分区：
文献类型：
--
作者：
Liu, J. B.;Yan, H. L.;Zhang, H. F.
研究了不同采食量(FI)对饲喂中、低磷日粮的生长猪磷的表观全肠道消化率(ATTD)和标准全肠道消化率(MID)的影响。选用72头公猪(初始体重41.2+/-0.8 kg)，采用完全随机区组设计，采用3×3因子设计，3个日粮(无磷日粮、低磷玉米日粮或中磷玉米-豆粕日粮)和3个FI水平(每天添加3、4或5%SW)，每个处理组8头重复。采用总收集法计算P的ATTD，调整期为5d，收集期为7d。通过对基础内源性磷损失(EPL)的磷的ATTD进行校正来计算磷的STTD。数据采用SAS混合统计软件进行统计分析。各日粮中FI水平的线性和二次效应由正交多项式对比来确定。结果表明，随着FI水平的提高，猪的日基础EPL呈线性增加(P<；0.05)。饲喂低磷日粮的仔猪日粮磷摄入量、粪磷排出量、消化磷、磷的ATTD和STTD均低于中磷日粮(P<；0.01)。饲料中磷的摄入量、粪磷排出量和消化磷随饲料中FI水平的增加而增加(线性，P<；0.01)。P的ATTD(P<；0.01)和STTD(P<；0.1)随FI水平的增加而降低。随着FI水平的提高，中磷日粮仔猪磷的ATTD和STTD呈线性下降(P<；0.05)。然而，在低磷日粮中，FI水平对P的ATTD和STTD没有线性或二次效应。综上所述，生长猪体内磷的ATTD和STTD随FI水平的升高而降低。然而，日粮磷浓度影响猪磷对FI水平的ATTD和STTD反应。
The present study was conducted to investigate the effect of feed intake (FI) level on the determination of apparent total tract digestibility (ATTD) and standardized total tract digestibility (MID) of phosphorus (P) for growing pigs fed diets containing moderate and low P concentrations. Seventy-two barrows (initial body weight (BW) = 41.2 +/- 0.8 kg) were used in a randomized complete block design with a 3 x 3 factorial arrangement of 3 diets (a P-free diet, a cornstarch based low-P diet or a corn-soybean meal based moderate-P diet) and 3 graded FI levels (3, 4 or 5% of SW per day) with 8 replicate pigs per treatment group. The total collection method was used to calculate ATTD of P with a 5-d adjustment period followed by a 7-d collection period. The STTD of P was calculated by correcting ATTD of P for basal endogenous P losses (EPL) determined from feeding a P-free diet. Data were analyzed by the MIXED procedure of SAS. Linear and quadratic effects of FI level within each diet were determined by orthogonal polynomial contrasts. The results showed that daily basal EPL of pigs increased linearly with increasing FI level (P < 0.05). Pigs fed a low-P diet had lower dietary P intake, fecal P output, digested P, ATTD and STTD of P than that in pigs fed a moderate-P diet (P < 0.01). Dietary P intake, fecal P output, and digested P increased with increasing FI level within each diet (linear, P < 0.01). The ATTD (P < 0.01) and STTD (P < 0.1) of P decreased with increasing FI level. There were linear decreases in ATTD and STTD of P for pigs fed the moderate-P diet as the level of FI increased (P < 0.05). However, no linear or quadratic effect of FI level on ATTD and STTD of P was found in pigs fed a low-P diet. In conclusion, the ATTD and STTD of P decrease with increasing FI level for growing pigs. However, dietary concentration of P affects the ATTD and STTD of P responses of pigs to FI level.