ADSC 3400 Chapter Notes - Chapter 7-9: Cell Membrane, Gonadotropin, Theca Interna
16 Oct 2016
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A period when cyclicity stops: due to inadequate nutrition or environmental conditions. Period between one estrus and the next: 3 types of estrous cyclicity: polyestrus, seasonally polyestrus, monoestrus. 4 stages of an estrous cycle: proestrus, estrus, metestrus, diestrus. Reproductive pattern; refers to several estrous cycles that may occur during a certain season of the ear: two things that influence the onset of seasonal breeding are photoperiod and temperature. Females can become pregnant throughout the year without regard to season. Display clusters of estrous cycles that occur only during a certain season of the year: examples: sheep, goats, mares, deer, and elk. Short-day breeders which begin cycle as day length decreases in autumn: examples: sheep, goats, deer, and elk. Long-day breeders which initiates cyclicity as day length increases in the spring: example: mare. Females that have 1 cycle per year: examples: dogs, wolves, foxes, and bears. Periods of estrus last for several days.
