“Global” and “local” predictions of dairy diet nutritional quality using near infrared reflectance spectroscopy

• Published in: Journal of dairy science 2010-10, Vol.93 (10), p.4961-4975
• Main Authors: Tran, H., Salgado, P., Tillard, E., Dardenne, P., Nguyen, X.T., Lecomte, P.
• Format: Article
• Language: English
• Subjects: accuracy; Animal Feed - standards; Animal Nutritional Physiological Phenomena; Animal productions; Animals; Biological and medical sciences; Calibration; Cattle; dairy cattle; dairy diet; diet; Diet - standards; Diet - veterinary; diet study techniques; digestibility; equations; feces; Feces - chemistry; feed intake; Feeding. Feeding behavior; France; Fundamental and applied biological sciences. Psychology; milk yield; monitoring; near infrared reflectance spectroscopy; nutritional adequacy; Nutritive Value; prediction; quality; Quality Control; Reproducibility of Results; sampling; Spectroscopy, Near-Infrared - methods; Spectroscopy, Near-Infrared - veterinary; Terrestrial animal productions; Vertebrates; Vertebrates: anatomy and physiology, studies on body, several organs or systems; Vietnam
• ISSN: 0022-0302; 1525-3198
• DOI: 10.3168/jds.2008-1893

The objective of the study was to evaluate performance of classic (global) and innovative (local) calibration techniques to monitor cattle diet, based on fecal near infrared reflectance spectroscopy (NIRS). A 3-yr on-farm survey (2005–2008) was carried out in Vietnam and La Reunion Island to collect animal, feed intake, and feces excretion data. Feed and feces were scanned by a Foss NIRsystem 5000 monochromator (Foss, Hillerød, Denmark) to estimate diet characteristics and nutrient digestibility. A data set including 1,322 diet-fecal pairs was built and used to perform global and local calibrations. Global equations gave satisfactory accuracy [coefficient of determination (R2) >0.8, 10% ≤ relative standard error of prediction (RSEP) ≤20%], whereas local equations gave good accuracy (R2 >0.8, RSEP 0.9, RSEP