Prediction of Cortisol and Progesterone Concentrations in Cow Hair Using Near-Infrared Reflectance Spectroscopy (NIRS)
Autor: | Elena Albanell, Oriol Tallo-Parra, Laura Monclús, Xavier Manteca, Annaïs Carbajal, Manel Lopez-Bejar |
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Rok vydání: | 2017 |
Předmět: |
0301 basic medicine
Hydrocortisone Reflectance spectroscopy Analytical chemistry Sensitivity and Specificity 01 natural sciences Immunoenzyme Techniques Matrix (chemical analysis) 03 medical and health sciences medicine Animals Steroid Measurement Instrumentation Progesterone Spectroscopy Spectroscopy Near-Infrared Chromatography medicine.diagnostic_test Chemistry 010401 analytical chemistry Reproducibility of Results Predictive value Reflectivity 0104 chemical sciences 030104 developmental biology Immunoassay Linear Models Cattle Female Near infrared reflectance spectroscopy Reproductive state Hair |
Zdroj: | Applied Spectroscopy. 71:1954-1961 |
ISSN: | 1943-3530 0003-7028 |
Popis: | Concentrations of different steroid hormones have been used in cows as a measure of adrenal or gonadal activity and, thus, as indicators of stress or reproductive state. Detecting cortisol and progesterone in cow hair provides a long-term integrative value of retrospective adrenal or gonadal/placental activity, respectively. Current techniques for steroid detection require a hormone-extraction procedure that involves time, several types of equipment, management of reagents, and some assay procedures (which can also be time-consuming and can destroy the samples). In contrast, near-infrared reflectance spectroscopy (NIRS) is a multi-component predictor technique, characterized as rapid, nondestructive for the sample, and reagent-free. However, as a predictor technique, NIRS needs to be calibrated and validated for each matrix, hormone, and species. The main objective of this study was to evaluate the predictive value of the NIRS technique for hair cortisol and progesterone quantification in cows by using specific enzyme immunoassay as a reference method. Hair samples from 52 adult Friesian lactating cows from a commercial dairy farm were used. Reflectance spectra of hair samples were determined with a NIR reflectance spectrophotometer before and after trimming them. Although similar results were obtained, a slightly better relationship between the reference data and NIRS predicted values was found using trimmed samples. Near infrared reflectance spectroscopy demonstrated its ability to predict cortisol and progesterone concentrations with certain accuracy (R2 = 0.90 for cortisol and R2 = 0.87 for progesterone). Although NIRS is far from being a complete alternative to current methodologies, the proposed equations can offer screening capability. Considering the advantages of both fields, our results open the possibility for future work on the combination of hair steroid measurement and NIRS methodology. |
Databáze: | OpenAIRE |
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