From: Time trends and epidemiological patterns of perinatal lamb mortality in Norway
2000 | 2010 | |
---|---|---|
% | % | |
Litter size | ||
1 | 22.9 | 17.7 |
2 | 55.9 | 51.3 |
3 | 19.3 | 26.8 |
4 | 1.7 | 3.8 |
>4 | 0.2 | 0.4 |
Age of ewe (year) | ||
1 | 21.4 | 23.1 |
2 | 24.0 | 24.0 |
3 | 19.4 | 18.7 |
4 | 15.4 | 13.7 |
5 | 10.3 | 9.8 |
6 | 6.3 | 6.7 |
>6 | 3.2 | 4.0 |
Lambing ease | ||
Normal | 78.3 | 75.0 |
Assistance, not dystocia | 11.0 | 12.0 |
Assistance, dystocia | 10.7 | 13.0 |
Time of lambing | ||
Prior to April 1 | 1.1 | 2.2 |
April 1–15 | 10.5 | 14.0 |
April 16–30 | 39.0 | 40.2 |
May 1–15 | 39.3 | 35.2 |
May 16–31 | 9.4 | 7.9 |
After May 31 | 0.7 | 0.5 |
Breed | ||
Norwegian White | 77.1 | 80.4 |
Spæl | 17.6 | 13.0 |
Old Norwegian breedsa | 1.4 | 2.2 |
Otherb | 3.9 | 4.4 |