Abstract
This chapter will show the results of applying short wavelength near-infrared spectroscopy (SW-NIRS) for measuring the somatic cell count (SCC) in non-homogenized, raw milk using the multiple linear regression method. Near-infrared (NIR) spectra of individual samples of non-homogenized milk from seven cows were measured daily using test tubes, in the 400–1,100 nm wavelength region, commencing seven days after parturition during 23 days of the lactation period. The NIR spectral dataset included measurements from animals with different physiological conditions—both healthy and mastitic (inflammation of mammary glands). Multiple linear regression (MLR) was used to model log SCC (in the range of 3.78–7.07, i.e., SCC ~ 6.025–11.75 million cells/ml) and yielded a correlation coefficient R = 0.853, a standard error of calibration SEC = 0.377, and a standard error of prediction SEP = 0.370, respectively. These values satisfy the demands for fast screening of SCC as a criterion for mastitis diagnosis in dairy cows. In addition, the correlation between milk constituents and spectra was analyzed to determine their influence. Protein in non-homogenized milk, including the SCC, was strongly correlated with a baseline fluctuation in the 600–700 nm wavelength region. The present results demonstrate that it is possible to determine log SCC levels by use of SW-NIRS in combination with MLR.
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Tsenkova, R., Muncan, J. (2022). Non-destructive Somatic Cell Count Measurement Using Near-Infrared Spectra of Milk in the 400–1,100 nm Short Wavelength Region. In: Aquaphotomics for Bio-diagnostics in Dairy. Springer, Singapore. https://doi.org/10.1007/978-981-16-7114-2_10
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DOI: https://doi.org/10.1007/978-981-16-7114-2_10
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