Adhikari P A, Heo J M, Nyachoti C M
Department of Animal Science, University of Manitoba, Winnipeg, MB, Canada R3T 2N2.
Department of Animal Science, University of Manitoba, Winnipeg, MB, Canada R3T 2N2 Department of Animal Science and Biotechnology, Chungnam National University, Daejeon, South Korea 305-764.
J Anim Sci. 2015 Jan;93(1):209-16. doi: 10.2527/jas.2014-7569.
The aim was to determine the true total tract digestibility (TTTD) and standardized total tract digestibility (STTD) of P in canola meals from Brassica napus black (BNB) and Brassica juncea yellow (BJY) fed to growing pigs. Fifty-four barrows with an initial BW of 19.9 ± 0.22 kg (mean ± SEM) were allocated in 3 consecutive blocks to 1 of 9 dietary treatments in a randomized complete block design to give 6 replicate pigs per diet. Dietary treatments were cornstarch based with increasing concentrations of P, that is, 0.8, 1.6, 2.4, and 3.3 g/kg (as-fed basis) from either BNB or BJY as the sole source of P and a gelatin-based P-free diet. Limestone was added to maintain a Ca:total P ratio of 1.2:1 in all diets. All diets contained titanium dioxide (3 g/kg) as an indigestible marker. Daily feed allowance was calculated to supply 2.6 times the maintenance energy requirement based on the BW at the beginning of each period and offered in 2 equal portions at 0800 and 1600 h as a dry mash. Pigs were individually housed in metabolism crates and fed experimental diets for 16 d, including 9 d for adaptation to feed and 5 d for total but separate collection of feces and urine. The apparent total tract digestibility values of P increased from 19.0 to 30.0% for BNB and from 17.3 to 28.3% for BJY as the dietary P content increased from 0.8 to 3.3 g/kg DM. The TTTD of P was determined using the regression analysis as dietary P content increased from 0.8 to 3.3 g/kg whereas the STTD of P was calculated for the diet with the highest P content (i.e., 3.3 g/kg, as-fed basis) using the P-free diet to estimate endogenous P losses (EPL). The total and basal EPL estimates obtained with regression analysis and the P-free diet were 665 ± 0.03 and 209 ± 96 mg/kg DMI, respectively. The TTTD of P was 33.3 and 32.0% in BNB and BJY, respectively. Respective STTD values were 31.0 and 28.3%. The results indicated that the TTTD and STTD of P were comparable in the 2 canola meals from BNB and BJY canola.
本研究旨在测定饲喂生长猪的甘蓝型油菜黑籽粕（BNB）和芥菜型油菜黄籽粕（BJY）中磷的真全肠道消化率（TTTD）和标准全肠道消化率（STTD）。将54头初始体重为19.9±0.22千克（均值±标准误）的公猪按连续3个区组随机分配到9种日粮处理中的1种，采用随机完全区组设计，每种日粮6头重复猪。日粮处理以玉米淀粉为基础，磷浓度逐渐增加，即分别以BNB或BJY为唯一磷源，磷浓度为0.8、1.6、2.4和3.3克/千克（风干基础），以及一种无磷的明胶日粮。添加石灰石以使所有日粮中钙与总磷的比例维持在1.2:1。所有日粮均含有二氧化钛（3克/千克）作为不消化标记物。根据各期开始时的体重，计算每日采食量以提供维持能量需求的2.6倍，并在0800和1600时以干粉料形式分两次等量投喂。猪单独饲养在代谢笼中，饲喂试验日粮16天，包括9天适应期和5天粪便和尿液完全但分开收集期。随着日粮中磷含量从0.8克/千克干物质增加到3.3克/千克，BNB中磷的表观全肠道消化率值从19.0%增加到30.0%，BJY中从17.3%增加到28.3%。当日粮中磷含量从0.8克/千克增加到3.3克/千克时，采用回归分析测定磷的TTTD，而采用无磷日粮估计内源磷损失（EPL），计算磷含量最高的日粮（即3.3克/千克，风干基础）的STTD。通过回归分析和无磷日粮获得的总内源磷损失估计值和基础内源磷损失估计值分别为665±0.03和209±96毫克/千克干物质采食量。BNB和BJY中磷的TTTD分别为33.3%和32.0%。各自的STTD值分别为31.0%和28.3%。结果表明，BNB和BJY两种油菜籽粕中磷的TTTD和STTD相当。
