Kruczek M, Gruca A
Department of Genetics and Evolution, Jagiellonian University, Kraków, Poland.
Lab Anim. 1990 Jan;24(1):36-9. doi: 10.1258/002367790780890392.
The sexual maturation of male mice reared under constant laboratory conditions was studied in animals born in different months of the year. The body weights were significantly affected by the month of birth. Males born in March and May were heavier at 4 and 5 weeks of age than those born in autumn and winter. As indicated by the relative weights of accessory glands, males born in spring matured earlier compared with animals born in other months of the year. Variation in the relative testicular weights during maturation was not influenced by the month of birth. Female mice also showed a significant relationship between the month of birth and sexual maturation. Females born in March reached puberty, as measured by the age of vaginal opening and first oestrus, earlier than those born in other months of the year.
在恒定实验室条件下饲养的雄性小鼠的性成熟情况，在一年中不同月份出生的动物身上进行了研究。出生月份对体重有显著影响。3月和5月出生的雄性小鼠在4周和5周龄时比秋冬出生的小鼠更重。从附属腺的相对重量来看，春季出生的雄性小鼠比一年中其他月份出生的动物成熟更早。成熟过程中睾丸相对重量的变化不受出生月份的影响。雌性小鼠出生月份和性成熟之间也存在显著关系。3月出生的雌性小鼠，以阴道开口年龄和首次发情来衡量，比一年中其他月份出生的雌性更早达到青春期。
