Meek L R, Lee T M
Department of Psychology, University of Michigan, Ann Arbor 48104-1687.
Physiol Behav. 1993 Dec;54(6):1201-10. doi: 10.1016/0031-9384(93)90349-k.
In a previous study, Meek and Lee found that female meadow voles mated within three distinct time periods after pairing with a male, and fertility was influenced by the time of mating and photoperiod. In the present studies, we tested the hypothesis that different patterns of mating would correlate with high and low fertility. We found two very different patterns of mating were correlated with high fertility. Females housed in long daylengths (long day; 14 h light/day) and mating within 48 h of pairing with a male, received few mounts, intromissions, and intromissions per ejaculatory series, with very short interintromission intervals. All long-day females utilizing this mating pattern ovulated, and 86-100% produced litters. We suggest this pattern of mating is associated with spontaneous estrus. In contrast to long-day females mating within 48 h, females housed in short daylengths (short day; 10 h light/day) and mating between 14-48 h after pairing with a male, received significantly more short mounts and intromissions, with longer interintromission intervals. These short day females all ovulated and 86% produced litters. We suggest that this pattern of mating is associated with an induced estrus. Short-day females that did not exhibit this pattern of mating (66%) produced far fewer litters. We discuss two mechanisms by which fertility may be inhibited in most short-day females.
在之前的一项研究中，米克和李发现雌性草甸田鼠在与雄性配对后的三个不同时间段内交配，并且生育能力受交配时间和光照周期的影响。在本研究中，我们检验了不同交配模式与高生育力和低生育力相关的假设。我们发现两种截然不同的交配模式与高生育力相关。饲养在长日照（长日；14小时光照/天）条件下且在与雄性配对后48小时内交配的雌性，接受的爬跨、插入次数以及每次射精系列中的插入次数较少，插入间隔非常短。所有采用这种交配模式的长日照雌性都排卵，并且86% - 100%产仔。我们认为这种交配模式与自发发情有关。与在48小时内交配的长日照雌性相反，饲养在短日照（短日；10小时光照/天）条件下且在与雄性配对后14 - 48小时交配的雌性，接受的短时间爬跨和插入显著更多，插入间隔更长。这些短日照雌性都排卵，并且86%产仔。我们认为这种交配模式与诱导发情有关。未表现出这种交配模式的短日照雌性（66%）产仔数要少得多。我们讨论了在大多数短日照雌性中生育能力可能受到抑制的两种机制。
