A Field Study to Unravel Factors that are Significantly Associated with the Secretory Activity of the Corpus Luteum During the First Three Postpartum Cycles in High Yielding Dairy Cows, Based on the Amount of Steroidogenic and Endothelial Cells Present in the Luteal Tissue

摘要: Fourteen multi- and eight primiparous high-yielding dairy cows were followed from the first till fourth ovulation postpartum. Cows randomly divided into two groups supplemented with soybean (group I; n = 11) or rapeseed meal II; 11). Both subjected to a biopsy sampling of corpus luteum (CL) at cycle day 9. The luteal capillary network (visualized by Bandeiraea simplicifolia) was denser in cycles 2 3 (p 0.0005). same seen for surface occupied steroidogenic cells 3β-hydroxysteroiddehydrogenase) 0.0001). peripheral blood progesterone concentration showed an increasing trend number higher 0.013), which had also larger glands on area endothelial positively correlated (r 0.59; p < areas negatively nonesterified fatty acids (NEFAs) (respectively, r -0.377; 0.004 -0.355; 0.007). We can conclude that generally have levels during three after calving is associated CL. In comparison those post-partum cycle, corpora lutea cells, while these are only concentrations.