Abstract
The significance of seasonal fluctuations in the components of the reproductive cycle is complex. In mammals, high environmental temperature may cause delayed puberty, delayed onset of sexual season, irregularity in cycle length, duration of estrus, ovulation rate, frequency of anovulatory estrus,morphological abnormalities in ova, fetal size and semen characteristics. High temperatures, in birds, may affect rate of egg laying, egg weight, shell quality, fertility, size of blastoderm and hatchability. Animals have developed effective thermoregulatory mechanisms for the testis. The effects of extremes of temperatures on reproduction vary with the species,breed, age, stage of reproductive cycle,period of temperature exposure, nature of temperature fluctuation and altitude. Effects of low temperature on reproduction have been little studied.
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