Bourke D A, Adam C L, Kyle C E
Rowett Research Institute, Bucksburn, Aberdeen.
Vet Rec. 1992 May 9;130(19):424-8. doi: 10.1136/vr.130.19.424.
An ultrasonic linear array scanner with a transrectal probe was used to observe ovarian and uterine changes associated with the reproductive cycle in llamas. 'Waves' of follicular development and regression occurred in unstimulated females, during which the dominant follicle reached a maximum size of 9 to 13 mm; both ovaries were equally active. Ovulation was induced by mating in 80 per cent of cases, and when mating was accompanied by the administration of human chorionic gonadotrophin the ovulation rate increased to 90 per cent and the time to ovulation decreased from two to three days to one to two days. Some spontaneous ovulations occurred. Corpora lutea reached a maximum size of 12 mm (non-pregnant) or 14 mm (pregnant) after seven or 16 days, respectively. The lifespan of the corpus luteum was approximately 11 days in non-pregnant llamas and the regression time was advanced by the administration of prostaglandin or embryo recovery. Pregnancy could be diagnosed as early as 19 days after mating.
使用带有经直肠探头的超声线性阵列扫描仪观察美洲驼生殖周期中卵巢和子宫的变化。在未受刺激的雌性美洲驼中出现卵泡发育和退化的“浪潮”，在此期间，优势卵泡最大可达9至13毫米；两侧卵巢活动程度相同。80%的情况下交配可诱导排卵，当交配同时给予人绒毛膜促性腺激素时，排卵率增至90%，排卵时间从两到三天缩短至一到两天。也会出现一些自发排卵。黄体分别在7天或16天后达到最大尺寸，非孕时为12毫米，怀孕时为14毫米。非孕美洲驼的黄体寿命约为11天，给予前列腺素或取出胚胎可使黄体退化时间提前。交配后19天即可诊断出怀孕。
