| Autor: |
de Blockey MA, Parr RA, Restall BJ |
| Jazyk: |
angličtina |
| Zdroj: |
Australian veterinary journal [Aust Vet J] 1975 Jun; Vol. 51 (6), pp. 298-302. |
| DOI: |
10.1111/j.1751-0813.1975.tb06957.x |
| Abstrakt: |
Eight sub-flocks each of 48 to 51 Merino ewes were mated for 18 days with 1 ram to each subflock. Four of the sub-flocks were of non-parous 1.5-year-old ewes and the other 4 were of parous 2.5-year-old ewes. Fertilisation rates for the subflocks of 1.5-year-old ewes varied from 83 to 94%, and the sub-flocks of 2.5-year-old ewes ranged from 81 to 94%. By day 29 post coitum 42% and 56% of 1.5-year-old ewes in sub-flocks 1 and 2 respectively were no longer pregnant. Embryonic mortality was low in other sub-flocks of 1.5- and 2.5-year-old ewes. Virtually all embryonic death occurred after day 12 post coitum. The sporadic occurrence of high ova wastage in maiden 1.5-year-old ewes in this experiment and in others is discussed in relation to the short duration of oestrus in young ewes and the great variation in service activity of rams. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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