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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