ISSN 1392-3196 / e-ISSN 2335-8947
Zemdirbyste-Agriculture, vol. 109, No. 2 (2022), p. 185–190
DOI 10.13080/z-a.2022.109.024
Effect of restricted grazing or feeding with total mix ration environments on the properties of milk quantity and quality from dairy cows of different genotypes
Kristina de VITTE, Sigita KERZIENĖ, Jolita KLEMENTAVIČIŪTĖ, Marius de VITTE, Vaida Dilbienė, Rasa UGENSKIENĖ, Elena BARTKIENĖ, Rolandas STANKEVIČIUS
Abstract
The effect of different feeding technologies, i.e., restricted grazing and non-grazing, on milk properties such as protein, fat, lactose, fatty acid content, somatic cell count, urea, and colour, in different β-casein CSN2 genotypes (A1A1, A1A2, and A2A2) were analysed in this study. It was found that the physicochemical composition of cow milk was affected by both non-grazing and grazing environment and genotype. Compared with the other genotypes, the A2A2 genotype cow milk showed a high polyunsaturated fatty acid and decreased the content of saturated fatty acid in the milk of restricted grazing and non-grazing groups and decreased the content of monounsaturated fatty acid in the restricted-grazing group. The A1A2 genotype cow milk resulted in a higher content of monounsaturated fatty acid in the non-grazing group compared with the milk of cows in the restricted grazing group. The results of our experiment show that restricted grazing positively affects the properties of milk quantity and quality and that the cows with the A2A2 genotype were well-suited to both restricted grazing and non-grazing systems.
Keywords: milk yield, milk colour, fatty acid, β-casein.
