Genetic variability of mastitis resistance is well established in dairy cattle. Many studies
focused on polygenic variation of the trait, by estimating heritabilities and genetic correlation …

The Canadian Test-Day Model is a 12-trait random regression animal model in which traits
are milk, fat, and protein test-day yields, and somatic cell scores on test days within each of …

Our data included 119,205 first-parity, test-day records from 15,002 Holsteins in 134 Georgia
farms with temperature and humidity data from 21 weather stations throughout Georgia. The …

A model that contains both fixed and random linear regressions is described for analyzing
test day records of dairy cows. Estimation of the variances and covariances for this model …

Electrical conductivity (EC) of milk has been introduced as an indicator trait for mastitis over
the last decade, and it may be considered as a potential trait in a breeding program where …

Using a mixed linear animal model, genetic parameters were estimated for clinical mastitis
(MAST), lactation average somatic cell score (LSCS), and milk production traits in the first 3 …

The literature on somatic cell count (SCC) is reviewed with particular emphasis on genetic
and phenotypic parameters and the suitability of the trait as an indirect means of reducing …

Data from 274 Dutch herds recording clinical mastitis (CM) over an 18-mo period were used
to investigate the effect of pathogen-specific CM on the lactation curve for somatic cell count …

Genetic parameters of subjectively scored milking speed and somatic cell score were
estimated using REML and a sire model. Approximately 250,000 records were used …

In test-day (TD) models, records from individual test days are used to determine lactation
production instead of aggregating records. Test-day models have recently gained …