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2023, № 108

UDC: 636.34/636.39.034
GSNTI: 68.39.29

Comparative analysis of the goat and sheep milk component composition

In the article the component composition of Lacon sheep and Alpine goats milk studied by infrared spectroscopy and flow cytometry with the use of automatic analyser CombiFoss 7 D is considered in a comparative aspect. It was revealed that in sheep milk the content of mass fraction of fat, true and total protein, casein, dry matter, saturated and unsaturated fatty acids was 1.5-1.9 times higher than in goat milk (p<0.001), while the number of somatic cells and their differential forms was lower (510.93 vs. 962.86 thousand units/mL; 55.7 vs. 82.27%). The general pattern for sheep and goat milk was a high positive relationship between protein mass fraction and casein (r = 0.95 and 0.97), fat mass fraction and fatty acids (r = 0.68-0.97), protein mass fraction and skimmed dry residue, solids (r = 0.83-0.92); medium to high between MJB and fatty acids (r = 0.31-0.99); between different classes of fatty acids (saturated and unsaturated) (r = 0.43-1.00); medium positive between the number of somatic cells (CSC) and differential number levels of somatic cells (DCSC) (r = 0.33 and 0.36). Acetone and BHB in ewe milk and were positively correlated with each other (r = 0.87 and 0.88) and negatively with other components (r = -0.22-0.66). TFA in sheep milk was positively correlated with most of the parameters (r = 0.46-0.93), whereas in goat milk the relationship was either absent, positive (r = 0.21-0.48) or negative (r = -0.26-0.36). The relationship between CSC, DCSC and other components in sheep milk was mostly absent or very weak (r = 0.13-0.17), whereas in goat milk it was weakly correlated with protein mass fraction, casein, lactose and fatty acids (r = 0.13 and 0.28).
Keywords: Goats, sheep, milk, infrared spectra, somatic cells, correlation.
DOI: 10.21515/1999-1703-108-204-211

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Authors:

1. Selionova Marina Ivanovna, DSc in Biology, professor RAS, Head of the Department, RSAU - Moscow Timiryazev Agricultural Academy.
2. Gladkikh Marianne Yur'yevna, PhD in Agriculture, associate professor, RSAU - Moscow Timiryazev Agricultural Academy.
3. Sermyagin Alexander Aleksandrovich, PhD in Agriculture, leading researcher, Head of the Department, FSC for Animal Husbandry named after Academy Member L.K. Ernst.
4. Lashneva Irina Alekseevna, post-graduate student, junior researcher, FSC for Animal Husbandry named after Academy Member L.K. Ernst.