[Comparative studies of some methods of freezing bull sperm]

Comparative studies were carried out with a total of 27 ejaculates obtained from 20 bulls to establish the alleged advantages of some of the tested technological methods for freezing the semen in the form of pellets, ampules, straws, and minitubes. All four methods showed comparable results. The morphologic changes in the thawed semen, resp., spermatozoa varied within close limits--from 41 up to 42.5 per cent of the cells had secondary defects. So far as the extent of contamination was concerned the investigations showed that the four methods should be improved in terms of the hygiene standard in the collection and handling of semen, especially in the granulation of semen and its storage in the form of pellets.