Short communication: Validation of estimates of genetic trend in the Norwegian cattle population

Authors
Heringstad, B Klemetsdal, G Ruane, J
Citation
B. Heringstad et al., Short communication: Validation of estimates of genetic trend in the Norwegian cattle population, J DAIRY SCI, 82(12), 1999, pp. 2811-2812
Citations number
8
Categorie Soggetti
Food Science/Nutrition
Journal title
JOURNAL OF DAIRY SCIENCE
ISSN journal
00220302 → ACNP
Volume
82
Issue
12
Year of publication
1999
Pages
2811 - 2812
Database
ISI
SICI code
0022-0302(199912)82:12<2811:SCVOEO>2.0.ZU;2-8
Abstract
We examined alternative definitions of herd x year effects in models used t o estimate genetic trends for clinical mastitis in Norwegian Cattle. The mo del with random herd x year effects showed significant bias and clearly ove restimated genetic trend. To obtain unbiased estimates of genetic trend for clinical mastitis with this data, herd x year should be defined as fixed. Our results emphasized the importance of validating estimates of genetic tr end.