动物粪便近红外光谱的应用潜力

Potential Applicability of Fecal NIRs:A Review

近红外光谱技术(NIRS)以其低成本、高效、环保、无损的优势在日粮和畜产品品质分析中得到广泛应用。饲料品质参数(如粗蛋白)的获取对于日粮营养的合理搭配不可或缺,传统的近红外光谱技术将日粮的近红外光谱与日粮品质参数的化学测定值进行回归,建立预测模型对日粮品质参数进行检测。然而,在放牧条件下日粮近红外光谱的难以获取限制了这一传统建模方法在动物营养中的应用。作为动物代谢性产物,动物粪便不仅包含有日粮信息也携带有动物自身信息。近年来,基于动物粪便近红外光谱和日粮信息(日粮植物学成分、化学成分及其消化率)建立的回归模型,也已被用于动物日粮信息的检测。简要介绍F.NIRS在动物性别、品种鉴定及繁殖和寄生虫感染状态检测中的应用。NIRS在动物粪肥分析中的应用结果表明NIRS能够对粪肥中主要成分含量进行快速分析。尽管F.NIRS预测准确性有待提高,但已显示出其作为快速、有效的分析工具用于检测日粮品质参数及动物生理状态的潜力。相关的英文评述性文章业已出版,但在中国F.NIRS的研究和应用非常欠缺。期望本文的呈现有助于F.NIRS在国内的发展。推荐将NIRS作为快速分析工具用于对粪肥主要成分(DM,OM,TS,VS,TN,TKN和NH3-N)含量进行检测。

Near-infrared reflectance spectroscopy（NIRS）is an inexpensive,rapid,environment-friendly and non-invasive analytical technique that has been extensively applied in the analysis of the dietary attributes and the animal products.Acquisition of dietary attributes is essential for nutritional diagnoses to provide animals with reasonable diet.Traditionally,the calibration equations for the prediction of dietary attributes（e.g.crude protein）are developed from feed NIR spectra and the results of conventional chemical analysis（i.e.reference data）.It is difficult to obtain the NIR spectra of forages consumed by grazing animals,so the method of this calibration is inappropriate for free-grazing herbivores.Feces,as the animal＇s metabolites,contain the information about both the animal＇s diet and the animal itself.Recently,Fecal-NIRS（F.NIRS）has been directly used to monitor diet information（botanical composition,chemical composition and digestibility）,based on correlation between reference data and fecal NIR profile.Subsequently,some additional application（such as sex and species discrimination,reproductive and parasite status）of F.NIRS also is outlined.In the last,application of NIRS in animal manure is summarized.NIRS was shown to be an alternative to conventional wet chemical methods for analyzing some nutrient concentrations in animal manure rapidly.Overall,this paper proves that F.NIRS is a rapid and valid tool for the determination of the dietary attributes and of the physiological status of animal,although more efforts need to be done to improve the accuracy of the F.NIRS technique.Several researchers in English have reviewed the applications of F.NIRS.In China,however,there is a paucity of research and application regarding F.NIRS.We expect that this paper in Chinese will be helpful to the development of F.NIRS in China.At the same time,we propose NIRS as a simple and rapid analytical method for predicting the main chemical composition（dry matter,organ matter,total solid,volatile solid,total nitrogen,total Kjeldahl nitrogen and ammonium nitrogen）in animal manure.