DOI: 10.11118/978-80-7701-100-6-0204

VYUŽITÍ DISKRIMINAČNÍ ANALÝZY PRO POSOUZENÍ ROZDÍLŮ PRSNÍ SVALOVINY

USE OF DISCRIMINANT ANALYSIS TO ASSESS DIFFERENCES IN BREAST MUSCLE OF CHICKENS FED WITH DIFFERENT FEEDS WHILE MAINTAINING THE SAME NUTRIENT CONTENT

Michaela Králová¹, Eliška Dračková², Filip Dytrt², William Owusu-Afriyie², Martina Lichovníková², Vladimír Zmrhal²

¹ Ústav hygieny a technologie potravin živočišného původu a gastronomie, Fakulta veterinární hygieny a ekologie, Veterinární univerzita Brno, Palackého tř. 1946/1, 612 42 Brno, Česká republika

² Ústav chovu a šlechtění zvířat, Agronomická fakulta, Mendelova univerzita v Brně, Zemědělská 1665/1, 613 00 Brno, Česká republika

The aim of the work was to use discriminant analysis to assess differences in the breast muscle spectra of chickens fed different feeds (control, 10% and 20% rapeseed meal, 10% and 20% sorghum) while maintaining the same nutrient content, where two criteria (sex, feed) were evaluated. The spectra of chicken breast muscle (n = 60) were measured by the method of near-infrared spectroscopy with Fourier transform on the integrating sphere in the reflectance mode using a compression cuvette in the spectral range of 10,000–4,000 cm⁻¹. 37 Principal Components were found for both calibration models. When evaluating the sex criterion, 15 samples were not assigned to the correct class, but to the secondary class. For the feed effect criterion, 9 samples were not assigned correctly. The results of the Mahalanobis distance indicate that it increases between classes, but is not large enough, to find variability between classes. The results show that there are no noticeable differences in the Musculus pectoralis spectra between roosters and hens. These differences were not found even among chickens fed different diets.

Keywords: FT-NIR spectroscopy, discriminant analysis, Mahalanobis distance, chicken meat, feed

pages: 204-210, online: 2026