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diff --git a/Excel/van der Werf.xlsx b/Excel/van der Werf.xlsx
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diff --git a/data/sample.csv b/data/sample.csv
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+id,birthdate,dam,sire,year,sex,weaning_weight
+1,1/1/1990,,,1990,male,354
+2,1/1/1990,,,1990,female,251
+3,1/1/1991,,1,1991,male,327
+4,1/1/1991,,1,1991,female,328
+5,1/1/1991,2,1,1991,male,301
+6,1/1/1991,2,,1991,female,270
+7,1/1/1992,,,1992,male,330