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首页> 外文期刊>Journal of Animal Science >The use of a covariate reduces experimental error in nutrient digestion studies in growing pigs.
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The use of a covariate reduces experimental error in nutrient digestion studies in growing pigs.

机译：使用协变量可减少生长中猪的营养物质消化研究中的实验误差。

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Covariance analysis limits error, the degree of nuisance variation, and overparameterizing factors to accurately measure treatment effects. Data dealing with growth, carcass composition, and genetics often use covariates in data analysis. In contrast, nutritional studies typically do not. The objectives of this study were to (1) determine the effect of feeding diets containing dehulled, degermed corn, corn-soybean meal, or distillers dried grains with solubles on nutrient digestibility coefficients, (2) evaluate potential interactive effects between initial and final treatment diets on the final treatment diet effects, and (3) determine if initial criterion (digestibility or physiological values) would effectively correct for variation among pigs that could thereby affect final treatment diet digestibility coefficients. Seventy-two crossbred barrows [(Yorkshire x Landrace x Duroc) x Chester White] were randomly assigned to 1 of the 3 diets within initial dietary treatment for Phase-2 (P2; 14 d). Fecal and blood samples were collected after feeding the Phase-1 (P1) diets for 14 d (trial d-14) and on d 28 after feeding the P2 diets for 14 d. Fecal samples were dried and analyzed for C, ether extract, GE, N, NDF, P, and S. Plasma samples were analyzed for plasma urea N and triacylglycerides. Pigs were fed diets that differed widely in CP, NDF, and P, resulting in an overall decrease in C, GE, NDF, N, P, and S digestibility and plasma urea N and triacylglycerides as dietary fiber increased in P1 and P2 (P<0.10). There were no differences in P2 criteria due to blocking for the P1 diet. There tended (P=0.10 to 0.20) to be P1 x P2 interactions for NDF and S, indicating that the response of pigs to the P2 diet may depend on the P1 diet. In contrast, when the P1 variable was used as a covariate for P2 data, it was statistically significant for GE, NDF, N, S, and plasma urea N (P<0.10) whereas C and ether extract showed tendencies but not for P digestibility or plasma triacylglycerides. In conclusion, if initial diets are known, subsequent treatments should be balanced for the initial diet because of potential of initial diet x final diet interactions. If the initial diets are not known, then the initial digestibility coefficient would be effective in reducing the variation associated with subsequently obtained data and should be considered as a covariate in future grower-finisher swine digestibility research.
机译：协方差分析可限制误差，扰动变化的程度以及过度参数化的因素，以准确衡量治疗效果。有关生长，car体组成和遗传的数据通常在数据分析中使用协变量。相反，营养研究通常不这样做。这项研究的目的是（1）确定含有脱皮的，脱玉米的玉米，玉米豆粕或带有可溶物的干酒糟的日粮对营养物质消化率的影响，（2）评估初始和最终处理之间的潜在相互作用日粮对最终处理日粮消化率的影响;以及（3）确定初始标准（消化率或生理值）是否能有效纠正猪之间的差异，从而可能影响最终处理日粮的消化率。在第2阶段的初始饮食治疗中，将72头杂种公猪[（Yorkshire x Landrace x Duroc）x Chester White]随机分配给3种饮食中的1种（P2; 14 d）。喂食阶段1（P1）日粮14 d（试验d-14）和喂食P2日粮14 d后28 d，收集粪便和血液样本。干燥粪便样品并分析其C，醚提取物，GE，N，NDF，P和S。分析血浆样品中的血浆尿素N和三酰基甘油酯。猪的日粮中CP，NDF和P差异很大，随着P1和P2中膳食纤维的增加，其C，GE，NDF，N，P和S的消化率总体下降，血浆尿素氮和甘油三酯含量降低（P <0.10）。由于阻断P1饮食，P2标准没有差异。 NDF和S趋向于（P = 0.10至0.20）P1 x P2相互作用，表明猪对P2日粮的反应可能取决于P1日粮。相反，当将P1变量用作P2数据的协变量时，它对GE，NDF，N，S和血浆尿素N具有统计学意义（P <0.10），而C和醚提取物则显示出趋势，但对P的消化率没有影响。或血浆甘油三酯。总之，如果已知初始饮食，则由于初始饮食的潜力x最终饮食之间的相互作用，应在初始饮食中平衡后续治疗。如果不了解初始日粮，则初始消化系数将有效减少与随后获得的数据相关的变化，并且应在以后的生长肥育猪消化率研究中将其视为协变量。

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