V.L. Estergreen

TL;DR: The corpus luteum of pregnancy appeared essential for maintaining pregnancy in the bovine prior to Days 165–180; thereafter, a viable fetus was sometimes maintained in the absence of the gland, but the corpus lutenum was essential during late pregnancy to prevent shortened gestations and abnormal parturitions.

TL;DR: Plasma levels of cortisol and corticosterone were determined in 18 lactating, nonpregnant dairy cows of three breeds and also at hourly intervals following a single injection of 200 IU ACTH to five cows and no treatment to one cow.

TL;DR: Evaluated luteal function during pregnancy in cows 11 to 284 days after estrus, breeding, or pregnancy and partial correlations between content and concentration of progesterone, 20 β -ol, and total progestin in the CL were 0.87.

TL;DR: An enzyme immunoassay (EIA) for determination of progesterone in unextracted whole milk and to apply it to pregnancy diagnosis was developed and showed that this EIA was comparable to the RIA.

TL;DR: Progesterone and Δ 4 -pregnene-20 β -ol-3-one (20 β-ol) were chemically assayed in 42 corpora lutea, ovaries, ovarian venous blood plasma, and jugular venous lymphocyte blood plasma samples collected from 31 non-pregnant dairy cows and heifers.