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The development of sexual activity and semen production in ram lambs of two prolific breeds: Romanov and Finnish Landrace

Published online by Cambridge University Press:  02 September 2010

F. Louda ,
J. M. Doney ,
L. Štolc ,
J. Křížek  and
J. Šmerha
F. Louda
Affiliation:
Department of Cattle Breeding, Agricultural University, Prague, Czechoslovakia
J. M. Doney
Affiliation:
Department of Cattle Breeding, Agricultural University, Prague, Czechoslovakia
L. Štolc
Affiliation:
Department of Cattle Breeding, Agricultural University, Prague, Czechoslovakia
J. Křížek
Affiliation:
Department of Cattle Breeding, Agricultural University, Prague, Czechoslovakia
J. Šmerha
Affiliation:
Department of Cattle Breeding, Agricultural University, Prague, Czechoslovakia
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Abstract

The development of sexual activity, sperm production, semen characteristics, testis growth and body size was studies in 10 male sheep (ram lambs) of the Romanov breed and 11 of the Finnish Landrace breed between the ages of 4 and 15 months.

The sexual responses, observed daily for 40 days from the age of 4 months, developed earlier and more intensively in the Romanov than in the Finnish ram lambs, being fully developed in the former breed after 4 days as compared with 14 days in the latter breed. All lambs of both breeds, however, were considered capable of impregnating females by 5 months of age.

In both breeds there was a considerable delay between the onset of sexual maturity and the time at which it became possible to collect semen by means of an artificial vagina. Successful collection was not achieved until the age of 11 months, there being no difference between breeds in this respect.

Subsequent semen production increased to the 14th month of age, with little difference between breeds. Respectively for Romanov and Finnish rams at this age (±s.e.), the mean ejaculate volume was 0·85 + 0·062 and 0·77±0·052ml; motility 64·6 ± 1·62 and 59·7±l·66%; sperm concentration 4·75±0·198 and 4·7 ± 0·197 ×1012perl; number of sperm per ejaculate 4 09±0·338 and 3·63 ±0·259 × 109; and fructose concentration 6·84 × 0·2606 and 4·87 ± 0·2707g/1. In the 15th month there was a tendency for these values to decline except in the case of sperm concentration and, hence, total sperm number.

Mean live weight and size increased until the 14th month and there was no difference between breeds, but testis length and diameter were greater in the Romanov rams at this age.

Type
Research Article
Information
Animal Production , Volume 33 , Issue 2 , October 1981 , pp. 143 - 148
Copyright
Copyright © British Society of Animal Science 1981

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References

REFERENCES

Alberio, R. and Colas, G. 1976. Influence of photoperiodism on the sexual development of the young Ile-de-France ram. VIIth Int. Congr. Anim. Reprod. Artif. Insem., Krakov, Vol. 3, pp. 26–29.Google Scholar
Colas, G., Personnic, D., Courot, M. and Ortavant, R. 1975. Influence de rythme de recolte sur la production de spermatozoides chez le jeune belier romanov. Annls Biol. anim. Biochim. Biophys. 24: 189–198.Google Scholar
Doney, J. M., Louda, F., Smerha, J. and Skrivan, M. 1977. [The effect of season on sperm production in rams.] Zivoc. Vyroba 22: 923–929.Google Scholar
Dyrmundsson, Ó. R. 1973. Puberty and early reproductive performance in sheep. II. Ram lambs. Anim. Breed. Abstr. 41:419–430.Google Scholar
Jakubec, V. and Krízek, J. 1976. The fertility of prolific breeds (the Finnish sheep, Romanov and East Friesian milk-sheep) and their crosses with the mutton Merino. 27th A. Meet. Eur. Ass. Anim. Prod., Zurich (Abstr.).CrossRefGoogle Scholar
Kastyrak, L. 1969. [effect of age on quantity and quality of semen in the ram.] Zesz. probl. Postep. Nauk roln. 95: 203–208.Google Scholar
Land, R. B. 1970. The mating behaviour and semen characteristics of Finnish Landrace and Scottish Blackface rams. Anim. Prod. 12: 551–560.Google Scholar
Land, R. B. 1977. Genetic variation and improvement. In Reproduction in Domestic Animals, 3rd ed., (ed. Cole, H. H. and Cupps, P. T.), pp. 577–604. Academic Press, New York.Google Scholar
Land, R. B. and Carr, W. R. 1975. Testis growth and plasma LH concentration following hemicastration and its relation to female prolificacy in sheep. J. Reprod. Fert. 45: 495–501.CrossRefGoogle ScholarPubMed
Lopyrin, A. I. 1971. [Biology of Reproduction in Sheep.] Kolos, Moscow.Google Scholar
Louda, F., Krízek, J., Ŝtolc, L. and Reksoprodjo, P. 1978. [Sperm quality of rams in commercial conditions with respect to their fertilization capacity.] Zivoĉ. Výroba 23: 423–428.Google Scholar