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Limited By:	Author = Green, Martin J.;

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Association between somatic cell count during the first lactation and the cumulative milk yield of cows in Irish dairy herds (2019)

McCoy, Finola; Archer, Simon; Wapenaar, Wendela; Green, Martin J.

Association between somatic cell count during the first lactation and the cumulative milk yield of cows in Irish dairy herds (2019)

McCoy, Finola; Archer, Simon; Wapenaar, Wendela; Green, Martin J.

Abstract:

Reduced potential milk yield is an important component of mastitis costs in dairy cows. The first aim of this study was to assess associations between somatic cell count (SCC) during the first lactation, and cumulative milk yield over the first lactation and subsequent lifetime of cows in Irish dairy herds. The second aim was to assess the association between SCC at 5 to 30 d in milk during parity 1 (SCC1), and SCC over the entire first lactation for cows in Irish dairy herds. The data set studied included records from 51,483 cows in 5,900 herds. Somatic cell count throughout the first lactation was summarized using the geometric mean and variance of SCC. Data were analyzed using linear models that included random effects to account for the lack of independence between observations, and herd-level variation in coefficients. Models were developed in a Bayesian framework and parameters were estimated from 10,000 Markov chain Monte Carlo simulations. The final models were a good fit to...

http://hdl.handle.net/11019/1816