DOI: 10.11118/nutrinet2026_007

EFFECT OF CATTLE BREED ON MUSCLE PROTEIN

Natalie Klessy¹, Eva Straková¹, Pavel Suchý¹

¹ Department of Animal Breeding, Animal Nutrition and Biochemistry, Faculty of Veterinary Hygiene and Ecology, University of Veterinary Sciences Brno, Palackého tř. 1946/1, 612 42 Brno, Czech Republic

The study evaluated differences in muscle protein quality in the m. longissimus, pars thoracis of bulls from the Aberdeen Angus and Czech Fleckvieh breeds reared under identical extensive pasture-based conditions. A significantly higher crude protein content (P ≤ 0.05) was found in Czech Fleckvieh bulls (886.96 ± 87.36  g/kg of dry matter) compared to Aberdeen Angus bulls (812.48 ± 59.31 g/kg of dry matter). The Czech Fleckvieh breed also exhibited greater concentrations of non-essential amino acids (389.79 ± 37.92 vs. 363.91 ± 44.48 g/kg of dry matter; P ≤ 0.05), essential amino acids (405.95 ± 38.95 vs. 382.25 ± 41.00 g/kg of dry matter; P ≤ 0.05), and total analysed amino acids (795.74 ± 74.85 vs. 746.16 ± 82.71 g/kg of dry matter; P ≤ 0.05) than Aberdeen Angus. Breed significantly affected the content of most analysed amino acids (P ≤ 0.05), whereas no breed differences were detected for tyrosine and phenylalanine (P > 0.05). Lysine was the most abundant essential amino acid, with contents of 73.43 ± 8.23 g/kg of dry matter in Aberdeen Angus and 76.57 ± 8.87 g/kg of dry matter in Czech Fleckvieh (P ≤ 0.05). Among non-essential amino acids, glutamic acid was the most abundant, reaching 108.97 ± 14.35 g/kg of dry matter in Aberdeen Angus and 119.42 ± 12.47 g/kg of dry matter in Czech Fleckvieh (P ≤ 0.05). These findings suggest that breed influences crude protein concentration and the amino acid profile of muscle tissue.

Keywords: genotype; pasture; beef; nutrients; nutritional quality

pages: 66-71, online: 2026