Evolution of the metabolic activity of goat fatty tissue during the two first months of lactation; relation with the milk secretion

Le poids de l’épiploon (rapporté au DNA) de 5 chèvres en 9e semaine de lactation est en relation inverse avec la quantité de lait produite au cours des 2 premiers mois de lactation. Cette relation semble résulter d’un dépôt de lipides dans le tissu adipeux, d’autant plus précoce que les animaux produisent moins de lait. L’activité de 4 enzymes lipogéniques et la monoinsaturation des acides gras de l’épiploon tendent par ailleurs à augmenter chez 4 des 5 chèvres, entre la 3e et la 9e semaine de lactation.Omental adipose tissue weight ( relative to DNA) from 5 French Alpine goats at week 9 after parturition was closely and negatively related to the amount of milk produced during the first two months of lactation. The relationship seemed to result from a lipid deposition into adipose tissue which was earlier in lower-yielding animats. This emphasizes the competition between adipose and mammary tissues in milking ruminants. On the other hand, omental acetyl-CoA carboxylase, glucose-6-phosphate deshydrogenase, malic enzyme and lipoprotein lipase activities, and percent of monounsaturated fatty acids in this tissue tended to increase in 4 goats among 5, between 3 and 9 weeks post-partum