title: Atherogenicity index and health-related fatty acids in different stages of lactation from Friesian, Jersey and Friesian×Jersey cross cow milk under a pasture-based dairy system.
abstract: The objective of the study was to investigate the effect of stage of lactation on the fatty acid profiles of milk from Friesian, Jersey and Friesian×Jersey cows. Linoleic acid in pastures was highest in the second phase which coincided with mid-lactation days (p<0.05). Highest milk moisture content and lowest fat free dry matter content was seen in early lactation (p<0.05). Higher fat content was observed in late lactation than early lactation. Highest butyric, caproic, linoleic, omega-6 and polyunsaturated fatty acids were observed for milk from Friesian cows. Highest conjugated fatty acids, α-linolenic acid, linoleic acid, saturated fatty acids, polyunsaturated fatty acids, omega-6, and omega-3 were observed in early lactation. Atherogenicity index and desaturase activity indices were highest in late lactation. In conclusion, stage of lactation and genotype affected milk health-related fatty acid profiles.
authors.affiliation: Department of Livestock and Pasture Science, Faculty of Science and Agriculture, University of Fort Hare, P Bag X1314, Alice 5700, South Africa.
authors.forename: C T W
authors.initials: CT
authors.lastname: Nantapo
authors.forename: V
authors.initials: V
authors.lastname: Muchenje
authors.forename: A
authors.initials: A
authors.lastname: Hugo
mesh_terms: D000822:Animal Husbandry / Q000379:methods; D000818:Animals; D002417:Cattle / Q000235:genetics / Q000254:growth & development* / Q000502:physiology; D005227:Fatty Acids / Q000032:analysis* / Q000378:metabolism; D005260:Female; D006824:Hybridization, Genetic; D007774:Lactation; D008892:Milk / Q000737:chemistry* / Q000378:metabolism
chemical_list: D005227:Fatty Acids
keywords: Conjugated fatty acids; Desaturase activity; Genotype