Serum Levels of Luteinizing Hormone and Progesterone During the Estrous Cycle, Pseudopregnancy and Pregnancy in the Dog

摘要: Serum levels of LH and proges-terone were measured by radioimmunoassay competitive protein binding techniques respectively in nonmated, sterile-mated (to a vasectomized male) fertile-mated female beagles. There no differences the pattern secretion non-pregnant pregnant animals. The elevated for approximately 4 days, with peak concentration (27 ± 5.2 ng/ml) occurring on day prior t o first standing estrus. At all other times, remained between 2–4 ng/ml. Ovulation was observed late estrus or nearly 24 hr after peak. By 10 days peak, progesterone had increased to 20–30 ng/ml nonpregnant dogs. In nonpreg-nant animals, similar: decreasing from subsequently waning nondetectable (<0.5 80 On hand, dogs, progesterone...