Spermiation of paddlefish (Polyodon spathula, Acipenseriformes) stimulated with injection of LHRH analogue and carp pituary powder [induced breeding]

The potentiel of carp pituitary powder (CPP) at one dose, or the luteinizing hormone-releasing hormone (LH-RH) analogue, des-Gly10,(D-Ala6)-LH-RH-ethylamide, at three different doses to stimulate spermiation in paddlefish (Polyodon spathula) was tested. Single injections of the LH-RH analogue at 0.2...

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Bibliographic Details
Published in:Aquatic living resources (Montrouge) 2000, Vol.13
Main Authors: Linhart O, Mims S.D, Gomelsky B, Hiott A.E, Shelton W.I, Cosson J, Rodina M, Gela D
Format: Article
Language:English
Subjects:
espermatogenesis
hormonas liberadoras
hormonas pituitarias
hormonas sinteticas
hormone hypophysaire
hormone synthetique
macho
maitrise de la reproduction
male
males
pituitary hormones
polyodon
releasing hormone
releasing hormones
reproduccion dirigida
reproduction control
spermatogenese
spermatogenesis
synthetic hormones
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Summary:The potentiel of carp pituitary powder (CPP) at one dose, or the luteinizing hormone-releasing hormone (LH-RH) analogue, des-Gly10,(D-Ala6)-LH-RH-ethylamide, at three different doses to stimulate spermiation in paddlefish (Polyodon spathula) was tested. Single injections of the LH-RH analogue at 0.2, 0.1, or 0.05 mg/kg increased the number of spermatozoa per kilogram of body weight (/kg b.w.) by 4.7, 3.4, and 3.4 times respectively compared to control, but the number of spermatozoa per kilogram of body weight decreased with CPP (4 mg/kg) by 1.7 times compared to the control. The LH-RH analogue prolonged active spermiation, with numbers of spermatozoa ranging from 7.69 to 1.19 x 10(9) /kg b.w. up to 96 h after treatment. Analysis of variance showed significant influence of experimental groups on volume of sperm per male and per kilogram of body weight, and the total number of spermatozoa per kilogram of body weight, but insignificant influence on the total number of spermatozoa per male. The percentage of motile spermatozoa was not different between experimental groups for sperm collection at different times after injection. A very high positive correlation (r = 0.93) was obtained between sperm concentration and sperm transmittance measured with a spectrophotometer. This relationship was described with the following linear regression: sperm concentration (x 10(9) /mL) = 1.3244 X (-0.9969), where X is the percentage of sperm transmittance.
ISSN:0990-7440
1765-2952