Attempts on freezing the Greylag (Anser anser L.) gander semen.
Semen of Greylag (Anser anser L.) ganders was frozen according to a method previously elaborated by the authors for freezing the White Koluda gander semen. Semen was collected from five to eight Greylag ganders, twice a week during three succeeding reproductive cycles, by dorso-abdominal massage. Semen samples were diluted in the ratio of 1:1 or 2:1 (two parts semen: one part diluent) with EK diluent, supplemented by 6% DMF, equilibrated and pre-frozen to -140 degrees C at a rate 60 degrees C/min, before being transferred into liquid nitrogen container. Semen samples thawed in a water bath of 60 degrees C were used for twice a week insemination in a volume of 200 microl. Three Greylag and three White Koluda geese were involved in frozen-thawed semen fertilizing ability test. The reproductive cycle of wild geese lasts usually about 6-7 weeks. The ejaculate volume (30-140 microl) and sperm concentration (10x10(6) to 150x10(6) ml(-1)) are much lower than these of domestic ganders, but spermatozoa morphology is similar, particularly while compared to 1-year-old White Koluda ganders semen. There are about 90% of live spermatozoa and about 30% of live morphologically normal cells in Greylag gander fresh semen. The Greylag gander spermatozoa susceptibility to cryopreservation procedure is as high as in domestic ganders. Dilution ratio 2:1 resulted in higher number of live spermatozoa, which withstood cryoinjury stress. In relation to fresh semen about 60% of spermatozoa remained intact (on the basis of light microscope examination) in the frozen-thawed semen. Insemination of frozen-thawed semen resulted in 37.5% of fertile eggs in Greylag and 25.0% in White Koluda geese. Low fertility rate was caused by an insufficient number of live normal spermatozoa used for insemination (about three million in every dose).
Łukaszewicz
E
E
Department of Poultry Breeding, Institute of Animal Breeding, Agricultural University of Wrocław, 51-630 Wrocław, Poland. ewa@gen.ar.wroc.pl
Chrzanowska
M
M
Jerysz
A
A
Chełmońska
B
B
D000818:Animals; D002470:Cell Survival; D015925:Cryopreservation / Q000662:veterinary*; D005260:Female; D005777:Geese; D007315:Insemination, Artificial / Q000662:veterinary; D008297:Male; D012662:Semen Preservation / Q000662:veterinary*; D013076:Sperm Count; D013094:Spermatozoa / Q000002:abnormalities / Q000502:physiology; D020858:Tissue and Organ Harvesting / Q000379:methods / Q000662:veterinary