Influence of floristic grazing cover on sheep milk quality | Vplyv floristického zloženia pasienkového porastu na kvalitu ovčieho mlieka
2009
Meľuchová, B., Comenius University, Bratislava (Slovak Republic). Faculty of Natural Sciences. Institute of Chemistry | Blaško, J. | Kubinec, R. | Górová, R. | Michalec, M. | Vargová, V. | Kováčiková, Z. | Margetín, M. | Soják, L.
Changes in the fatty acids (FA) composition of pasture plant species during pasture season in two meteorologically different years and their changes in ewes milk were analyzed by gas chromatography. The changes in cis-9, trans-11 18:2 (CLA) content are determined primarily by the alpha-linolenic acid (ALA) content in pasture plants. The content of ALA as the most abundant FA in pasture, in dryer year 2007 decreased from mid-May to mid-August from 62.4% to 38.8% (g 100/g plant fat content) (P lt 0.001) and that in mid-September increased to a similar value as that in May. A similar trend was also found in CLA content in milk, when 2.3% content in May decreased to 1.3% (P lt 0.001) content in July and subsequently it increased to 2.3% content in September (g 100/g milk fat content). In the year 2008, which was colder and rainier during pasture season, the highest CLA contents were noted in May (2.3%) and September (2.0%), nevertheless, a minimum in milk CLA content (1.3%) was found in June linked with a higher average temperature and lesser rainfall compared to July 2008. According to the FA composition of ewes milk fat, including CLA content, the September ewes milk was similar in quality to the May milk.
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