Genetic evaluation of livestock is based on appropriate modelling of phenotypic measurements. In ruminants, faecal egg count (FEC) is commonly used to measure resistance to nematodes. A series of repeated FEC measurements may provide information about the population dynamics. A total of 6,378 FEC measures were determined for 409 animals between 1992 and 2003 from BARC Wye Angus herd. Original data were transformed using Box-Cox transformation to approach normality. The database was analysed using Random Regression Models (RRM), by the REML method. RRM may be used as a new tool for genetic and non-genetic studies of FEC. Within the different orders of Legendre polynomials used, those with more parameters (order 4) adjusted FEC data best. Results indicated FEC to be a moderately heritable characteristic.

M. VGB Silva, C. P van Tassell, T. S Sonstegard, Jaime A Cobuci, L. Gasbarre

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 15.34, 2006
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