Phenotypic and genetic relationships between somatic cell counts and clinical mastitis in French dairy Holstein cows
Year: 2000
Type: article
Abstract: This paper summarizes three already published studies about the relationships between somatic cell counts (SCC) and clinical mastitis (CM) in French Holstein.These studies were based on CM data collected by the milk recording technicians at each test-day since September 1995 in Western France.The first two studies focused on the putative risk of CM associated with very low SCC.The first one analyzed the risk of the first CM occurrence according to the SCC level at first test-day by survival analysis.The second one analyzed the risk of CM in second lactation by logistic regression according to SCC criteria measured in first lactation.Results were consistent and showed that lower the SCC level, lower the risk of CM.Decreasing SCC level in the population should not increase CM risk and there is no intermediate optimum.In the third analysis, genetic parameters were estimated.The genetic correlation between SCC and CM was high (0.72) and selection for lower SCC level should increase resistance to both clinical and subclinical mastitis.
Authors: Didier Boichard, Rachel Rupp
Language: English
Subfield: Animal Science and Zoology
Domain: Life Sciences
Open Access status: diamond
OpenAlex ID: W1941318291