Prediction of the Chemical Composition of Fresh Whole Crop Barley Silages by Near Infrared Spectroscopy

Abstract

Near infrared reflectance spectroscopy (NIRS) has become increasingly used as a rapid and accurate method of evaluating some chemical compositions in forages and feedstuff. This study was carried out to explore the accuracy of near infrared spectroscopy (NIRS) for the prediction of chemical parameters of fresh whole crop barley silages. A representative population of 284 fresh whole crop barley silages was used as a database for studying the possibilities of NIRS to predict chemical composition. Samples of silage were scanned at 1 nm intervals over the wavelength range 680~2,500 nm and the optical data were recorded as log 1/Reflectance (log 1/R) and were scanned in fresh condition. NIRS calibrations were developed by means of partial least-squares (PLS) regression. NIRS analysis of fresh whole crop barley silages provided accurate predictions of moisture, acid detergent fiber (ADF), neutral detergent fiber (NDF), crude protein (CP) and pH, as well as lactic acid content with correlation coefficients of cross-validation (R 2 cv) of 0.96, 0.81, 0.79, 0.84, 0.72 and 0.78, respectively, and standard error of cross-validation (SECV) of 1.26, 2.83, 2.18, 1.19, 0.13 and 0.32% DM, respectively. Results of this experiment showed the possibility of the NIRS method to predict the chemical parameters of fresh whole crop barley silages as a routine analysis method in feeding value evaluation and for farmer advice.

Effects of hybrid and bacterial inoculation on fermentation quality and fatty acid profile of barley silage

“…The chemical compositions of the fresh barley forages and of silages ensiled for 100 days are similar to those reported in previous studies using the same hybrids (Lee et al 2014;Kim et al 2015). Park et al (2008) reported higher concentrations of DM and CP in their fresh forages relative to those of the hybrids in this study, presumably reflecting differences in soil type, fertilization and maturity at harvest. For unknown reasons, the CP concentration was reduced by inoculation after 100 days of ensiling.…”

“…Two barley hybrids used in this study were developed at National Institute of Crop Science, RDA, Suwon, South Korea by the conventional crossbreeding method (Park et al 2008). Yuyeon (Fig.…”

“…The Youngyang silage had higher DM and lower NDF and ADF concentrations and less IVDMD than the Yuyeon silage. Yuyeon is classified as a 'smoothawn', lower production (9.5 tonnes, DM/ha) and average silage quality (Flieg's score: 2) hybrid, whereas Youngyang is a 'rough awn', higher productivity (10.6 tonnes, DM/ha) and average silage quality (Flieg's score: 3) hybrid (Park et al 2008). Rough awn silking barley hybrids (Fig.…”

Prediction of the Chemical Composition and Fermentation Parameters of Winter Rye Silages by Near Infrared Spectroscopy

“…The statistics of the calibrations with the lowest SECV on the whole data set and those of the corresponding calibrations on the calibration set are given in The moisture content of silage is very important in the forage quality control and feeding system. The standard error of cross validation (SECV) for the prediction of moisture content in winter rye silage sample (1.51%) was similar to those reported by Park et al (2013; and Sinnaeve et al (1994).…”

Predicción de la calidad fermentativa de ensilados de girasol mediante espectroscopía de reflectancia en el infrarrojo cercano (NIRS) sobre muestras secas

“…Un trabajo realizado con un colectivo similar al de este trabajo, una colección de 50 muestras secas y molidas de ensilados experimentales de girasol, cuyo resultado mostró una menor capacidad predictiva para la estimación del pH que en el presente trabajo, con valores inferiores de r 2 vc (0.86), RER (5.9), RPD (2.5) y mayor de EEVC (0.44) (22) . En otros trabajos, sobre muestras en estado fresco, han obtenido una menor capacidad predictiva para el valor de pH que en este trabajo, con valores de r 2 vc de 0.85, 0.72 y 0.78 en ensilados de hierba (4) , ensilados de cebada (23) y ensilados de raigrás (24) , respectivamente.…”