Reproduction in Sminthopsis macroura (Marsupialia : Dasyuridae) I. The Female
Reproduction in Sminthopsis macroura (Marsupialia : Dasyuridae) I. The Female
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Sminthopsis macroura（有袋动物纲：Dasyuridae）的繁殖 I. 雌性
DOI：
10.1071/zo9900187
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发表时间：
1990
影响因子：
0.8
通讯作者：
P. Woolley
中科院分区：
文献类型：
--
作者：
P. Woolley
一个由3只雌性和4只雄性组成的实验室群维持了4个繁殖季节。繁殖成功率很高，在种群解散前繁殖了四代。这些动物的后代在殖民地建立11年后仍在另一个实验室繁殖。给出了一个繁殖地维护和管理的详细处方。这些动物在6月至2月之间繁殖，大多数雌性在该季节的前几个月，即7月或8月首次进入发情期。出生季节早（10月中旬之前）的雌幼鸟在出生季节成熟，年龄为86-159天；那些晚出生的在185-262天的时候在接下来的季节成熟。在每一组中，出生较晚的人成熟得更早。性成熟时的最小体重为12.5克。一个季节至少可以饲养两窝幼崽，个体可以在一个以上的季节繁殖。大斑蛱蝶多发期，平均周期为23.25天。妊娠期约为11天，育儿袋内最多可容纳8只幼崽。哺乳期雌鼠可在幼鼠70天断奶前10天返回卵细胞。排卵自发，平均形成黄体20.7个。黄体在妊娠后期达到最大尺寸，在哺乳期比非哺乳期退化得更快。在哺乳期不间断的雌性卵巢中，可以识别出多达三代的黄体。体重、育儿袋的变化，以及生殖道的大体和组织学外观在怀孕和假怀孕的雌性中是相同的。
A laboratory colony of S. macroura, founded by three females and four males, was maintained over four breeding seasons. Reproductive success was high and four generations were produced before the colony was disbanded. Descendants of these animals are still breeding in another laboratory 11 years after the founding of the colony. A detailed prescription for the maintenance and management of a breeding colony is given. The animals bred between June and February, most females first entering oestrus in the early months of the season, in July or August. Female young born early in the season (before mid-October) matured in the season of their birth at an age of 86-159 days; those born later matured in the following season at an age of 185-262 days. In each group, those born later matured earlier. Minimum body weight at sexual maturity was 12.5 g. At least two litters can be reared in a season and individuals may breed in more than one season. S. macroura is polyoestrous with a mean cycle length of 23.25 days. The gestation period is about 11 days and up to eight young can be accommodated in the pouch. Lactating females may return to oesrrus up to 10 days before the young are weaned at 70 days old. Ovulation occurs spontaneously and the mean number of corpora lutea formed was 20.7. The corpora lutea reach maximal size late in pregnancy and they regress more rapidly in lactating than in non- lactating females. Up to three generations of corpora lutea could be recognised in the ovaries of females undergoing cycles uninterrupted by lactation. Changes In body weight, the pouch, and the gross and histological appearance of the reproductive tract were the same in pregnant and pseudopregnant females.