Tag: Sperm

Timing of Mating, Sperm Dynamics: DISCUSSION(8)

Male capture rates remained relatively high until Day 21 of the rut (26 August), after which time male trapping rate declined significantly. A similar pattern of increased male activity later in the rut was obtained by radio-tracking studies and was shown to be associated primarily with movements between communal nests possibly in an effort to […]

Read more

Timing of Mating, Sperm Dynamics: DISCUSSION(7)

This supports radio-tracking data collected by Lazenby-Cohen and Cockburn from a female on Day 18 after the commencement of the rut; these data indicated that this female was not visiting male nest trees at this time and had significantly reduced her foraging range from that observed early (Day 7) in the mating period. Together, these […]

Read more

Timing of Mating, Sperm Dynamics: DISCUSSION(6)

One explanation for this might be that the duration of sperm storage in female agile Antechinus is related to the likelihood that an estrous female will encounter a male to inseminate her prior to ovulation. Hence, in a population of high density where the likelihood of encountering a male during estrus is great, lengthy periods […]

Read more

Timing of Mating, Sperm Dynamics: DISCUSSION(5)

Much has been made of laboratory studies showing that female Antechinus have the ability to store spermatozoa for extended periods (up to 2 wk) in the lower isthmus of the oviduct prior to ovulation. It was interesting to note, therefore, that the peak in the number of mated females caught (55%) and the ovulation date […]

Read more

Timing of Mating, Sperm Dynamics: DISCUSSION(4)

In captivity, females will usually mate a number of times during estrus. Captive females that have mated twice to completion typically have between 40 and 75 X 103 spermatozoa per side. In the reproductive tracts of 8 of the 11 mated females (—73%) caught in this study, less than 30 X 103 spermatozoa per side […]

Read more

Timing of Mating, Sperm Dynamics: DISCUSSION(3)

No other field data are available on length of copulation in this species. However, recent captive mating trials, both with and without competing males, showed that ejaculation in this species occurs sometime between the first and third hour of mating, adding further weight to the argument for the existence of lengthy copulations in the wild […]

Read more

Timing of Mating, Sperm Dynamics: DISCUSSION(2)

Lazenby-Cohen and Cockburn also questioned the accuracy of Scott and Tan’s data and conclusions, suggesting that they were unaware that these animals nested communally and that mating probably also occurred in the nests. As a result, they suggested that Scott and Tan may have underestimated the probability that radioactive contamination may have influenced their results. […]

Read more