New prediction models for gross energy of pig urine using urinary nitrogen concentration and body weight: technical note.

IF 2.5 2区 农林科学 Q1 AGRICULTURE, DAIRY & ANIMAL SCIENCE
Animal Bioscience Pub Date : 2025-09-01 Epub Date: 2025-05-12 DOI:10.5713/ab.25.0097
Hyunseok Do, Bokyung Hong, Jeonghyeon Son, Noa Park, Beob Gyun Kim
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引用次数: 0

Abstract

The objectives were to evaluate previous equations for estimating gross energy (GE) of pig urine using urinary nitrogen (N) and to develop novel equations for estimating GE concentrations of pig urine. A total of 136 urine samples were obtained from pigs fed 18 diets in 2 experiments. The samples were analyzed for GE and N concentrations. The accuracy of previous equations was assessed by regressing the measured values minus the predicted values for urinary GE concentration on the predicted values centered to the mean. Novel equations for estimating the urinary GE concentration were developed using urinary N concentration and body weight (BW) as independent variables. The previous equations overestimated (mean bias; p<0.001) urinary GE concentrations and the overestimation was more pronounced for the low-GE urine samples (linear bias; p<0.001). The novel equations developed in the present work were: urinary GE concentration (kcal/kg) = -7.51+12.83×urinary N (r2 = 0.92 and p<0.001) and -16.33+14.00×urinary N+0.192×BW-0.030×urinary N×BW (R2 = 0.92 and p<0.001) where N as g/kg and BW as kg. Overall, the previous equations overestimate urinary GE, particularly for low-GE urine of pigs. Gross energy concentrations in urine can be fairly accurately estimated using urinary N concentration and BW.

Abstract Image

利用尿氮浓度和体重预测猪尿总能的新模型。
本研究的目的是评估以往利用尿氮(N)估算猪尿总能(GE)的公式,并建立估算猪尿总能浓度的新方程。2个试验共采集18种饲粮猪的136份尿液样本。对样品进行GE和N浓度分析。通过将测量值减去尿GE浓度预测值回归到以平均值为中心的预测值,来评估先前方程的准确性。以尿氮浓度和体重(BW)为自变量,建立了估算尿GE浓度的新方程。前面的方程高估了(均值偏差;p
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来源期刊
Animal Bioscience
Animal Bioscience AGRICULTURE, DAIRY & ANIMAL SCIENCE-
CiteScore
5.00
自引率
0.00%
发文量
223
审稿时长
3 months
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