Vie CONG. INTERN. REPROD. ANIM. INSEM. ARTIF., PARIS, 1968, VOL. I

Technicians that have tried straws (paillettes) and pellets,
prefer to use the pellets.

In our country storage costs are important since our breeding
program requires a heavy sorting-out, so that only 30 - 40 %
of the long time stored pellets may come to use.Pellet freez-
ing is simple and labour-saving and storing 1is inexpensive.

RESULTS. As shown in Table II, the frozen pellet-semen has
given somewhat better results than one day old fresh semen.If
it can be assumed that there was no difference between the
years the result which is 0.8 higher 60 days N.R.% for pellet
semen, must be considered significant.

In Finland all A.I. associations have adopted +the pellet
freezing system and thus within the year 1968 about 800,000
cows will be inseminated by means of pellet-semen.

References

l. H. NAGASE & E.F. GRAHAM: Pelleted semen: Comparison of
different extenders and processes on fertility of bovine
spermatozoa. 1964. V Internat. Congr. Anim. Reprod.Vol.IV,
387.

2. B. STROM: Djupfrysningstekni%hoch fertilitetsresultat med
pelleterad tjursperma.1966.10 =~ Nordic Veterinary Congress
Vol & 3T T 45:706%

3, H. NAGASE, E.F. GRAHAM & T. NIWA:Pelleted semen:The effect
of glycerol 1level and composition thawing solution on
fertility of bovine spermatozoa. V Internat. Congr. Anim.
Reprod. 1964. Vol. IV, 404.

4. H. NAGASE & T. NIWA:Deepfreezing bull semen in concentrat-
ed pellet form. I. -Factors affecting survival of sperma-
tozoa. 1964. V Internat. Congr. Anim. Reprod.Vol.IV, 410.

5. H. NAGASE, T. NIWA, S. YAMASHITA & S. IRIE: Deepfreezing
bull semen in concentrated pellet form. II. -Protective
action of sugars. 1964. V Internat. Congr. Anim. Reprod.
Vol. IV, 498.

6. H. NAGASE, T. NIWA, S. YAMASHITA & S. IRIE: Deep freezing
bull semen in concentrated pellet form. III. -Fertility.
1964. V Internat. Congr. Anim. Reprod. Vol. IV, 503.

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