title: [Evaluation of fresh sample of alfalfa silage through near infrared reflectance spectroscopy (NIRS)].
abstract: It is very important to evaluate the fresh sample of alfalfa silage using near infrared reflectance spectroscopy technology (NIRS) for animal production. The nutrient content of forage means the contents of dry matter (DM), crude protein (CP), neutral detergent fiber (NDF), and acid detergent fiber (ADF) in the forage. Because of the high moisture content, it is difficult to make uniform samples for fresh forage and to get useful information from the spectrum. Therefore, it is hard to use NIRS analysis. In order to evaluate the feasibility of using NIRS to analyse the fresh alfalfa silage, the DM, CP, NDF and ADF contents of fresh alfalfa silage were evaluated by the near infrared reflectance spectroscopy model in this experiment using partial least square regression (PLS), Fourier transform technology and sample preparation with liquid nitrogen technology. The analysis samples were obtained through different cultivars, maturity, cuttings and ensiling method. The cross validation was determined between 0.884 6-0. 989 8. The standard error of cross validation was between 3.9 and 9.7 g x kg(-1) fresh weight. Fifty samples were used to test the performance of the models. The coefficients of correlation between the chemical value and the NIRS value are between 0.939 7 and 0.994 9, and the root mean square errors of prediction are between 1.9 and 8.3 g x kg(-1) fresh weight. The results showed that NIRS could be used to evaluate the nutrition of fresh forage.
authors.affiliation: College of Animal Science and Technology, China Agricultural University, Beijing 100094, China.
authors.forename: Peng-Fei
authors.initials: PF
authors.lastname: Chen
authors.forename: Yu-Ping
authors.initials: YP
authors.lastname: Rong
authors.forename: Jian-Guo
authors.initials: JG
authors.lastname: Han
authors.forename: Ji-Hua
authors.initials: JH
authors.lastname: Wang
authors.forename: Lu-Da
authors.initials: LD
authors.lastname: Zhang
authors.forename: Xiao-Jie
authors.initials: XJ
authors.lastname: Xu
mesh_terms: D000818:Animals; D004043:Dietary Fiber / Q000032:analysis; D016018:Least-Squares Analysis; D000455:Medicago sativa / Q000737:chemistry* / Q000145:classification; D009753:Nutritive Value; D010940:Plant Proteins / Q000032:analysis; D012015:Reference Standards; D012044:Regression Analysis; D015203:Reproducibility of Results; D012820:Silage / Q000032:analysis* / Q000592:standards; D013045:Species Specificity; D019265:Spectroscopy, Near-Infrared / Q000379:methods*
chemical_list: D004043:Dietary Fiber; D010940:Plant Proteins