Changes in triglyceride fatty acid composition of mammary secretions during involution.
Changes in fatty acid composition were determined for fat triglycerides from mammary secretions of 5 Holstein cows during the first 31 d of the nonlactating period. Proportions of short-chain (4:0 to 8:0) and medium-chain (10:0 to 14:0) fatty acids declined by about 50% during the first 3 d of involution, whereas proportions of stearic (18:0) and oleic acids (18:1) increased during the same period. Little change in proportions of those fatty acids occurred after d 3 of involution. Palmitic acid (16:0) was unchanged in proportion during involution. Fatty acid composition of mammary secretion triglycerides changed rapidly in the early nonlactating period, which may reflect a specific decline in de novo fatty acid synthesis in the involuting gland.
Hurley
W L
WL
Department of Animal Sciences, University of Illinois, Urbana 61801.
Warner
G J
GJ
Grummer
R R
RR
D000818:Animals; D002417:Cattle / Q000502:physiology*; D005223:Fats / Q000032:analysis*; D005227:Fatty Acids / Q000032:analysis*; D005260:Female; D007774:Lactation / Q000502:physiology; D008321:Mammary Glands, Animal / Q000378:metabolism / Q000502:physiology*; D008892:Milk / Q000032:analysis*; D011247:Pregnancy
D005223:Fats; D005227:Fatty Acids