Timing of Mating, Sperm Dynamics: RESULTS(4)

On 23 August, a further 2 (18%) of the females captured in this study that had mated but not yet ovulated were captured. The reproductive tracts of these females contained ~32.8 X 103 spermatozoa per side and ~5.1 X 103 spermatozoa per side, respectively (Fig. 3). The last female caught in this study that had mated but not yet ovulated was caught on 27 August. The reproductive tract of this animal contained —11.7 X 103 spermatozoa per side (Fig. 3). All females caught after this date had ovulated. buy yasmin online

Sperm Distribution in the Female Tract Across the Mating Season

The distribution of spermatozoa in the female reproductive tract differed significantly (p < 0.001) across the mating period. Sperm number in the lateral vagina of all mated females caught was low (1.2 X 103 ± 1.1 X 103 spermatozoa per lateral vagina) (Fig. 3; Table 1), accounting for approximately 15% (range 0-65%) of the total number of spermatozoa within the female reproductive tract (Fig. 3; Table 1). The maximum number of spermatozoa recovered from this segment of the tract in any one female was 4.2 X 103 spermatozoa per side, and the minimum was zero. Sperm numbers in the uteri were greater than those reported in the lateral vaginae (4.6 X 103 ± 7.0 X 103 sperm per uterus) but also varied considerably between animals and across the mating season (Fig. 3; Table 1).

TABLE 1. Sperm number and the percentage of sperm located in each segment of the female reproductive tract of wild-caught agile Antechinus during the rut.

Date of capture Lateral vagina Uterus Lower isthmus Upper isthmus Totalsperm
Sperm % Sperm Sperm % Sperm Sperm % Sperm Sperm % Sperm
6/8 850 50.0 300 17.6 550 32.4 0 1700
8/8 1650 16.5 550 5.5 7500 75.0 300 0 10000
20/8 1650 4.8 600 17.9 25850 75.7 550 3.0 34150
20/8 300 10.7 850 30.4 1650 58.9 0 1. 2800
20/8 300 0.5 25000 42.1 34150 57.4 0 0 59450
20/8 4150 65.4 1100 17.3 1100 17.3 0 0 6350
20/8 2200 2.9 00 9.5 64700 85.7 1400 1.9 75500
20/8 850 1.9 300 0.7 42500 94.3 1400 3.1 45050
23/8 0 0 7800 23.8 25000 76.2 0 0 32800
23/8 300 5.9 300 5.9 4450 88.1 0 0 5050
2 7/8 1100 9.4 1100 9.4 9150 78.5 300 2.6 11650
Mean 1214 15.3 4600 16.4 19691 67.2 359 1.1 25859
± S.D. + 1137 ±20.8 ±7044 ± 11.6 ±19888 ±22.8 ±521 ±1.3 ±25428

Category: Mating

Tags: Agile Antechinus, Mating, Ovulation, Sperm

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