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Please use this identifier to cite or link to this item: http://hdl.handle.net/11019/463

Title: Cow factors affecting the risk of clinical mastitis
Authors: Berry, Donagh P.
Meaney, William J
Keywords: Clinical Mastitis
History
Odds
Probability
Issue Date: 2005
Publisher: Teagasc (Agriculture and Food Development Authority), Ireland
Citation: D.P. Berry, W.J. Meaney. (2005) Cow factors affecting the risk of clinical mastitis. Irish Journal of Agricultural and Food Research 44: 147–156
Series/Report no.: Irish Journal of Agricultural and Food Research;vol 44
Abstract: The objective of the present study was to identify cow risk factors associated with development of clinical mastitis (CM) in subsequent stages of lactation. A total of 3,309 lactations from spring-calving Holstein-Friesian cows were included in the analysis; parity number ranged from one to three, inclusive. A generalised estimating equations approach with a logit link function was used to account for the binary nature of the data and the unequal number of repeated records per cow. The dependent variable was the probability of developing CM in the subsequent stage of lactation. Independent variables included in the model were chosen using stepwise selection; herd, year of birth, month of calving, parity, period of lactation and previous CM history significantly affected the probability of CM. Two-way interactions between parity and period of lactation and between parity and incidence of CM in the previous lactation were also included in the model. A greater probability of developing CM is expected in cows that experienced CM in the previous lactation and/or previously within the same lactation. The probability of CM occurring in cows that experienced at least one case of CM in the previous lactation was 0.92 to 3.75 times that of a cow that experienced no CM in the previous lactation. It is possible to predict the probability of an animal developing CM in the subsequent stage of lactation when information is available on the parity and month of calving of the animal and its previous history of CM.
Description: peer-reviewed
URI: http://hdl.handle.net/11019/463
http://www.teagasc.ie/research/journalarchives/vol44no2/0904.pdf
ISSN: 0791-6833
Appears in Collections:Animal & Bioscience
IJAFR, volume 44, 2005

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