title: Quality and quantity of smelt (Osmerus eperlanus L.) sperm in relation to time after hormonal stimulation.
abstract: The effect of Ovaprim (salmon GnRH analogue and a dopamine antagonist) treatment on the quantity and quality of smelt (Osmerus eperlanus L.) sperm was studied in relation to time after hormonal stimulation. Sperm was obtained at 0, 24, 48 and 72 h after treatment (n=13/each time point). Computer Assisted Sperm Analysis (CASA) was used to evaluate sperm motility parameters and histological analysis was used to examine the testis morphology. Only a small volume of semen (1-5 µl) was collected at the beginning of the experiment (time 0) but it dramatically increased 24 h after hormonal treatment. A further increase in semen volume was recorded 48 h after hormonal stimulation. CASA parameters, such as percentage of motile cells, progressive motility, curvilinear velocity, straightlinear velocity, straightness and amplitude of lateral head displacement of stripped sperm increased 48 h after hormonal treatment, which indicates high quality of sperm. No further increase in sperm quality was recorded at 72 h. Compared to stripped semen, testicular semen was characterized by a slightly lower quality. In addition, histological analysis indicated that 24 h after hormonal treatment, a high number of spermatozoa was released from the testis. Ovaprim-stimulated smelt became clearly darker than the control fish. In conclusion, our results suggest that smelt semen should be collected 48 h after hormonal stimulation to ensure high quality of semen. This time may vary depending on maturation status of testis.
authors: Institute of Animal Reproduction and Food Research of Polish Academy of Sciences, ul. Tuwima 10, 10-747 Olsztyn, Poland. b.cejko@pan.olsztyn.pl
authors: Radosław K
authors: RK
authors: Kowalski
authors: Piotr
authors: P
authors: Hliwa
authors: Beata I
authors: BI
authors: Cejko
authors: Jarosław
authors: J
authors: Król
authors: Robert
authors: R
authors: Stabiński
authors: Andrzej
authors: A
authors: Ciereszko
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D004294:Domperidone / Q000008:administration & dosage / Q000494:pharmacology*; D004338:Drug Combinations; D007987:Gonadotropin-Releasing Hormone / Q000008:administration & dosage / Q000494:pharmacology*; D006652:Histological Techniques / Q000662:veterinary; D008297:Male; D008853:Microscopy / Q000662:veterinary; D036441:Osmeriformes; D011044:Poland; D055101:Semen Analysis / Q000662:veterinary*; D013076:Sperm Count / Q000662:veterinary; D013081:Sperm Motility / Q000187:drug effects; D013094:Spermatozoa / Q000187:drug effects* / Q000502:physiology*; D013737:Testis / Q000033:anatomy & histology / Q000187:drug effects*; D013997:Time Factors
chemical_list: D004338:Drug Combinations; C527878:ovaprim; D007987:Gonadotropin-Releasing Hormone; D004294:Domperidone