BIOL30001 Lecture Notes - Lecture 9: Estrous Cycle, Cervical Ganglia, Corpus Luteum
17 Aug 2018
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Document Summary
Humans aren"t seasonal breeders but we do respond slightly to environment/season/weather. Percentage of lactating females dropped virtually to zero between december and april but feeding grain to one group overcame the seasonal decline and the mice regained reproductive activity. Is it the calorie balance of the food, or perhaps the hormones/ other factors in feed that allow her to be reproductively active. Correlation among annual pattern of rainfall, number of insects available, and percentage of sheath-tailed bats lactating in costal kenya. Rain drives rst reproductive phase, and rain and/or food drives secondary reproductive phase. Observed breeding seasons (% females pregnant) of deer mouse over usa same species but use di erent cues therefore rapid genetic selection for variants that maximise success e. g. light. Photoperiodic control requires 3 components: photoreceptor (clock, neural pathway linking clock to neuroendocrine pathways, endocrine response of hypothalamo-pituitary-gonadal axis.
