DOI - Mendel University Press

DOI identifiers

DOI: 10.11118/978-80-7509-994-5-0136

EFFECT OF SORGHUM SILAGE IN DIET OF DAIRY COWS ON EIGHTEEN-CARBON FATTY ACIDS IN MILK FAT

PETR MALÝ1, LUDMILA KŘÍŽOVÁ1, KATEŘINA DADÁKOVÁ1, TOMÁŠ KAŠPAROVSKÝ1
1 Department of Biochemistry, Faculty of Science, Masaryk University, Kotlářská 267/2, 611 37 Brno, Czech Republic

The aim of the study was to evaluate the effect of inclusion of sorghum silage into dairy cow diets on the eighteen-carbon fatty acids (FA) in milk fat. The on-farm experiment was carried out on mid-lactating Czech Fleckvieh cows (Agrospol a.d. Knínice, farm Vanovice) and was divided into two consecutive periods of 3 months each. In the first period cows were fed a total mixed ration (TMR) based on maize silage and grass haylage (Control) while in the second period grass haylage was partially replaced by sorghum silage (Sorghum). In each period samples of evening and morning milk were taken from ten cows and were analysed for basic constituents and FA profile. The basic milk components were analysed in an accredited laboratory (LRM Brno-Tuřany). The FA profiles were analysed using gas chromatography with flame ionization detection. The total content of C18 acids was on average 34.6% of all FAs in Sorghum and 29.4% in Control (P < 0.05). Similarly, a higher content of stearic (C18:0), oleic (C18:1n9c), linoleic (C18:2n6c) and α-linolenic (C18:3n3) acid was found in Sorghum compared to Control (P < 0.05). Content of linolelaidic acid (C18:2n6t) was not affected by the treatment (P > 0.05). The inclusion of sorghum silage into the ration had a positive effect on the content of polyunsaturated FAs and n-3 FAs (P < 0.05) and tended to increase n-6 FAs (P = 0.064).

Keywords: α-linolenic acid; linoleic acid; n-3 fatty acids; n-6 fatty acids; saturated fatty acids; unsaturated fatty acids

pages: 136-151, online: 2024



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