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Investigations on 54 Italian ganders from which semen was collected by massage showed that, as the breeding season advanced, the number of males that responded to massage increased. Increases were also observed in sperm concentration and the percentage of normal spermatozoa, but mean ejaculate...

Chelmonska, B.
Polskie Archiwum Weterynaryjne, 1972, 15, 3, pp 575-596