ISSN:
1439-0426
Quelle:
Blackwell Publishing Journal Backfiles 1879-2005
Thema:
Biologie
,
Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
Notizen:
A study of motility was carried out on spermatozoa of the Siberian sturgeon (Acipenser baerii Brandt) reared at the Cemagref experimental research station, St Seurin sur l'Isle, France. About 90% spermatozoa are activated within a few seconds after a double step dilution (final dilution 1/600) and the number of motile cells declines regularly to 10–20% after 2 mn. During the same period of time, the flagellum beat frequency remains stable at about 50 Hz for 30 sec and drops to 30 Hz after 60 sec. A morphological analysis of the movement of the flagellum shows that during the first 20 sec, waves are distributed on the entire length of the flagellum; later, they disappear progressively from the distal part within 1 mn in the case of 90% of the spermatozoa. Finally after 2 mn, most of the flagella are straight and devoid of wave. The ATP content declines very rapidly after activation from 7.58 ± 1.85 to 4.05 ± 1.51 nmol/108 spermatozoa within 5 sec (P=0.004). Spermatozoa left in the genital tract of the males over a period of 24 hrs (in vivo survival) do not show significant change in the percentage of motile cells (82 ± 14 vs 74 ± 15) nor in the ATP content (6.13 ± 2.37 vs 4.59 ± 1.42 nmoles/108 spermatozoa). An aliquot of these spermatozoa stripped from testis and stored during the same period of 24 hrs at 4°C shows a significant decrease in the percentage of motile cells from 82 ± 14 to 59 ± 30 (P〈0.01) and in the ATP content from 6.15 ± 2.4 to 1.95 ± 1.37 nmoles/108 spermatozoa (P=0.001).
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1111/j.1439-0426.1999.tb00234.x
