Effects of the Ageing of Rabbit Spermatozoa in Utero on Fertilization and Prenatal Development

Tesh, J.M.

doi:10.1530/jrf.0.0200299

Cited by 28 publications

(16 citation statements)

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“…The probability ofconception is affected by the length of time that sperm have resided in the female reproductive tract (Tesh, 1969;Edwards, 1980), and a male that deposits relatively few motile sperm at the optimal time may have a greater probability of siring an offspring than a male who ejaculates a voluminous quantity of relatively nonmotile sperm at suboptimal times, regardless ofthe two males' relative testicular sizes.…”

Section: Sperm Competition Testicle Size Andmentioning

confidence: 99%

Body Size, Sperm Competition, and Determinants of Reproductive Success in Male Savanna Baboons

Bercovitch

1989

Evolution

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Abstract. -One component of sexual selection is sperm competition. It has been reasoned that the intensity of sperm competition may be reflected in the relative testicular sizes of animals. Among males residing in multi male breeding systems, testicular size is relatively larger than among males residing in unimale mating systems. Information on whether differences in testicular size within a species can account for differences in male reproductive success is unavailable for natural populations of primates.A population ofsix troops ofsavanna baboons in Kenya was surveyed for morphometric analysis, and one of these troops was the subject of extensive behavioral observations afterwards. Testicular weights could not be obtained, but measurements of linear dimensions were transformed into volumetric estimates. Male weight accounted for 30% of the variance in testicular volume. Neither body size nor testicular volume was associated with differences in male reproductive activity. The outcome of fights over access to females could not be related to male body size, and ejaculatory patterns of males were independent of testicle size. Both sperm competition and aggressive competition intensified during the four-day optimum conception period, but fightsover access to consort females were infrequent.Among savanna baboons, the probability of an ejaculation resulting in a conception is fairly low, which may account for the infrequency of injurious fights. Although testicle size influences sperm production, it does not influence either the timing of mating or the fertilizing capacity of spermatozoa, and both of these factors probably account for a substantial fraction of the variance in male baboon paternity. Sperm competition is an adjunct to agonistic competition as a mechanism affecting male baboon reproductive success. It is concluded that male reproductive success in baboons is affected more by social factors than by morphological traits associated with size.

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Section: Sperm Competition Testicle Size Andmentioning

confidence: 99%

Body Size, Sperm Competition, and Determinants of Reproductive Success in Male Savanna Baboons

Bercovitch

1989

Evolution

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“…The longer the interval between intercourse, the greater the chance that fertilization, if it does take place, will involve gametes that have been in the reproductive tract for some time. There is much evidence from animals that delay in fertilization is associated with serious embryological consequences both in the case of the aged spermatozoon (Tesh & Glover, 1966;Thibault, 1970Thibault, , 1972, but especially in the case of the egg (Blandau & Young, 1938;Austin, 1961;Witschi, 1971). Butcher, Blue & Fugo (1969) found chromosomal changes following fertilization of 'overripe' ova in the rat.…”

Section: Variation In Abortion Ratementioning

confidence: 99%

Seasonality of birth in India

Bernard¹,

Bhatt

Potts

et al. 1978

J. Biosoc. Sci.

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The conception rate in Baroda and Manipal, India, is lowest during the hottest weather. The greatest extremes are found in Baroda and, following high summer temperatures, there is a prolongation of low conception rates which may indicate that part or all of the effect is mediated through an effect on scrotal temperature. However, other factors may also be involved and a reduction of coital frequency is likely at extremes of temperature. Seasonal changes in abortion, stillbirths and prematurity are also observed. Changes in spontaneous abortion could be due to heat stress in the mother or possibly to abnormal sperm production at high temperature or to less frequent coitus, leading to embryonic defects.

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“…The sperm enter the epididymis the next day after they are shed in the tubules and traverse the epididymis of the bull in 8 to 11 days (Noyes, 1968), 1960) reported that this transport time can be shortened by increasing the frequency of ejaculation, Since, under normal conditi.ons, only half of the sperm that enter the top of the epididymis emerge at the.tail, there must be resorption, disintegration or liquefaction of sperm by the epididymis (Noyes, 1968;Amann·and Almquist, 1961;Amann, 1969 (Dukelow, Frederick and Graham, 1960;Amann and Almquist, 1961;Almquist and Cunningham, 1967). Most studies on sperm aging and its effects on fertility have been conducted on rabbits (Glover, 1962;Gaddum and Glover, 1965;Tesh and Glover, 1966;Bedford, 1967;Paufler and Foote, 1968;Tesh and Glover, 1969). In general, they reported an increase in coiled tails and tailless heads due to aging of sperm in.the epididymis.…”

Section: Sperm Maturation and Transportmentioning

confidence: 99%

Evaluation of Epididymal Sperm by the Cannulation Technique and the Effects of In Vivo Storage in Angus Bulls

Deutscher

Wells

Battaglia

1974

Journal of Animal Science

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Effects of the Ageing of Rabbit Spermatozoa in Utero on Fertilization and Prenatal Development

Cited by 28 publications

References 0 publications

Body Size, Sperm Competition, and Determinants of Reproductive Success in Male Savanna Baboons

Body Size, Sperm Competition, and Determinants of Reproductive Success in Male Savanna Baboons

Seasonality of birth in India

Evaluation of Epididymal Sperm by the Cannulation Technique and the Effects of In Vivo Storage in Angus Bulls

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