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.
Zusammenfassung
Die Bedeutung von jahreszeitlichen Schwankungen der Komponenten im Fortpflanzungszyklus ist komplex. Bei SÄugetieren kann hohe Temperatur eine verspÄtere PubertÄt bewirken, spÄten Beginn der Brunst, UnregelmÄssigkeiten in der ZykluslÄnge,Oestrusdauer, Ovulationsrate und HÄufigkeit von anovulatorischen Oestrus, morphologische AbnormalitÄten der Eier, der Fötengrösse und des Samens.Bei Vögeln können hohe Temperaturen die LegetÄtigkeit, Eigewicht, SchalenqualitÄt, Fruchtbarkeit, Grösse des Blastoderms und Ausbrütbarkeit beeinflussen. Tiere haben wirksame thermoregulatorische Mechanismen für die Hoden entwickelt.Die Einflüsse von Temperaturextremen auf die Fortpflanzung variiert mit der Tierart, Zucht, Alter,Stadium im Fortpflanzungszyklus, Temperatureinwirkungszeit, Art der Temperaturschwankungen und Höhe. Die Bedeutung niedriger Temperatur für die Fortpflanzung ist noch wenig untersucht.
Resume
L'importance des fluctuations saisonnières sur le cycle de reproduction est complexe. Chez les mammifères, une température élevée peut causer un retard de la puberté et du rut des irrégularités de la durée du cycle et de l'oestrus ainsi que de la fréquence des ovulations; les cycles anovulatoires, les anomalies morphologiques de l'oeuf, de la semence et les variations de la grandeur fétale sont plus frequents. Chez les oiseaux les hautes températures peuvent influencer la ponte, le poids de l'oeuf, la qualité de la coquille, la fertilité, la grandeur de blastoderme et la tendance à couver. Les animaux ont développé des mécanismes thermorégulateurs efficaces pour les testicules. Les influences des extrÊmes de température sur la reproduction varient avec l'espèce, la race, l'âge,le stade du cycle de reproduction, la nature et la durée des différences de température et l'altitude. L'influence des basses températures sur la reproduction n'a pas encore été bien étudiée.
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Hafez, E.S.E. Effects of high temperature on reproduction. Int J Biometeorol 7, 223–230 (1964). https://doi.org/10.1007/BF02187454
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DOI: https://doi.org/10.1007/BF02187454