<abstract> <p>Two handheld near infrared (NIR) spectrometers were used to quantify crude protein ($CP$) content of mixed forage and feedstuff composed Sweet Bran, distiller's grains, corn silage, stalk. First was a transportable spectrometer, which measured in the visible NIR ranges (320–2500 nm) with spectral interval 1 nm (H1). Second smartphone from 900–1700 4 (H2). Spectral data...

The article examines existing methods for assessing the homogeneity of feed mixes in industry and agriculture. As an alternative to approaches, authors offer a low-cost online technology assess feed. feedstuff under study includes cattle or compound consisting naturally-grown (green mass freshly cut grass, haylage, corn silage, etc.) concentrated components (grain milling, sunflower, soybean me...