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Table 1 Number of ewes registered with a lambing date in the Norwegian Sheep Recording System each year from 2000 to 2010, numbers excluded for various reasons, and final numbers of ewes and lambs included in the current study

From: Time trends and epidemiological patterns of perinatal lamb mortality in Norway

Year

Exclusions

Ewes with a lambing date

Ewes with no lambsa

Ewes with >1 recordb

Ewes in flocks with incomplete recordsc

Ewes in the study

Lambs in the study

2000

281,380

2150

563

2036

276,631

554,007

2001

292,341

2053

1073

1938

287,277

580,445

2002

293,317

3137

865

1576

287,739

587,199

2003

295,714

3150

592

1092

290,880

601,980

2004

290,680

2277

972

1722

285,709

598,821

2005

291,193

3752

582

2337

284,522

598,771

2006

283,146

3311

297

1235

278,303

593,825

2007

272,728

2443

251

1479

268,555

573,721

2008

274,219

3851

215

2065

268,088

575,752

2009

292,088

21,443

124

1636

268,885

582,797

2010

288,536

17,187

154

1084

270,111

588,397

  1. aThere was a lambing date in the registry, but the ewes were excluded because no lambs (stillborn or liveborn) were recorded
  2. bThere were two or more records for the same ewe in the same year; one record was kept when records were identical; all were deleted when records were different
  3. cAll ewes were excluded in flocks with missing lambing records for several ewes