Random regression

Genetic parameters for test day somatic cell score in Brazilian Holstein cattle

C. N. Costa, Santos, G. G., Cobuci, J. A., Thompson, G., and Carvalheira, J. G. V., Genetic parameters for test day somatic cell score in Brazilian Holstein cattle, vol. 14, pp. 19117-19127, 2015.

Selection for lower somatic cell count has been included in the breeding objectives of several countries in order to increase resistance to mastitis. Genetic parameters of somatic cell scores (SCS) were estimated from the first lactation test day records of Brazilian Holstein cows using random-regression models with Legendre polynomials (LP) of the order 3-5. Data consisted of 87,711 TD produced by 10,084 cows, sired by 619 bulls calved from 1993 to 2007.

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