2015
DOI: 10.3168/jds.2014-8913
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Risk factors for the occurrence of new and chronic cases of subclinical mastitis in dairy herds in southern Brazil

Abstract: The aim of this research was to evaluate the risk factors for new and chronic subclinical intramammary infections (IMI) using the monthly somatic cells count of dairy cows. The study took place at 30 dairy herds with approximately 1,700 cows in lactation. Data characterizing the dairy farms and their milking management were obtained from a survey questionnaire. The somatic cells count values from 2 consecutive months were used to classify cows as either healthy or with new or chronic infections. A chi-squared … Show more

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Cited by 34 publications
(42 citation statements)
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“…In this regard, clusters 2 and 3 present the best udder cleanliness score when compared with cluster 1, as cows from cluster 2 present deeper udders. However, due to an increased parity, the udder tends to become more pendular, which may increase traumas during locomotion as well as dirtiness and, thus, the SCS (Pérez-Cabal and Alenda, 2002;Cardozo et al, 2015).…”
Section: Discussionmentioning
confidence: 99%
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“…In this regard, clusters 2 and 3 present the best udder cleanliness score when compared with cluster 1, as cows from cluster 2 present deeper udders. However, due to an increased parity, the udder tends to become more pendular, which may increase traumas during locomotion as well as dirtiness and, thus, the SCS (Pérez-Cabal and Alenda, 2002;Cardozo et al, 2015).…”
Section: Discussionmentioning
confidence: 99%
“…Cows with higher parity present deeper udders due to a weakening of the suspensory ligaments and an increase in udder size with the advancement of lactations. Therefore, udder tends to get closer to the floor, being exposed to pathogens and increasing the risk of new and chronical intramammary infections, which also increase SCS in milk (Ruegg and Pantoja, 2013;Cardozo et al, 2015). Cluster 2, however, is comprised of cows with deeper and cleaner udders in CBP, a factor that can be related to the good management of the compost bed.…”
Section: Discussionmentioning
confidence: 99%
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“…Staphylococcus aureus, continuam sendo o maior problema na maioria das regiões do país (Fontana et al, 2010;Jobim et al, 2010;Oliveira et al, 2011;Mello et al, 2012;Mota et al, 2012;Bandeira et al, 2013;Cardozo et al, 2015;Martins et al, 2015) e são responsáveis pela maior parte dos casos de MS (Dias, 2007). A ocorrência de patógenos contagiosos é menos afetada pelas mudanças ambientais de umidade e temperatura quando comparados com patógenos ambientais pelo fato da principal forma de transmissão ocorrer durante o procedimento de ordenha (Voltolini et al, 2001).…”
Section: Discussionunclassified
“…A análise rotineira de CCS individual das vacas é essencial para os programas de qualidade do leite (Ruegg e Pantoja, 2013;Cardozo et al, 2015…”
Section: Discussionunclassified