Sumar J, Fredriksson G, Alarcón V, Kindahl H, Edqvist L E
Acta Vet Scand. 1988;29(3-4):339-46. doi: 10.1186/BF03548627.
Six llamas and 6 alpacas were mated to vasectomized males; ovulation and corpus luteum formation followed. Progesterone in blood was elevated from day 5 and reached maximum concentrations of 10–20 nmol/1 on day 7–8. A rapid decline in progesterone levels occurred on day 9–10 in connection with repeated surge releases of prostaglandin F. Oestradiol-17β levels were > 100–200 pmol/1 during oestrus when the animals were mated. These high levels might have been caused by coital stimulation. A temporary increase was detected in connection with the rise in progesterone levels in the early luteal phase. With this exception levels of oestradiol stayed low, 20–40 pmol/1 during the luteal phase but rose in most animals after luteolysis to 40–60 pmol/1.
将6只美洲驼和6只羊驼与输精管切除的雄性交配；随后出现排卵和黄体形成。血液中的孕酮从第5天开始升高，在第7 - 8天达到10 - 20 nmol/1的最大浓度。在第9 - 10天，随着前列腺素F的反复激增释放，孕酮水平迅速下降。在发情期动物交配时，雌二醇-17β水平>100 - 200 pmol/1。这些高水平可能是由交配刺激引起的。在黄体早期，随着孕酮水平的升高检测到暂时增加。除了这种情况外，雌二醇水平在黄体期保持较低，为20 - 40 pmol/1，但在大多数动物黄体溶解后升至40 - 60 pmol/1。
