Staphylococcus aureus intramammary infection affects milk yield and SCC of dairy cows

Autor(es)

Botaro, Bruno Garcia ^{[1, 2]} ; Cortinhas, Cristina Simoes ^[3] ; Dibbern, Aline Gerato ^[3] ; Prada e Silva, Luis Felipe ^[3] ; Benites, Nilson Roberti ^[1] ; dos Santos, Marcos Veiga ^[3]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sch Vet Med & Anim Sci, Dept Prevent Vet Med & Anim Hlth, BR-05508270 Sao Paulo - Brazil

^[2] Univ Norte Parana, Dairy Sci & Technol Grad Program, BR-86041100 Londrina, PR - Brazil

^[3] Univ Sao Paulo, Sch Vet Med & Anim Sci, Dept Anim Prod & Nutr, BR-13635900 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: TROPICAL ANIMAL HEALTH AND PRODUCTION; v. 47, n. 1, p. 61-66, JAN 2015.
• Citações Web of Science: 9

Resumo

Staphylococcus aureus (S. aureus) is the most prevalent infectious microorganism affecting dairy cattle worldwide, and its pathogenic characteristics facilitate its spread in dairy herds. S. aureus intramammary infections (IMI) are mainly subclinical, and associated losses can exceed average herd losses where the pathogen is not isolated. However, the extent it affects milk composition at udder and quarter levels is still unknown, and cow composite milk losses may be underestimated due to the dilution effect. The aim of this study was to investigate the effects of S. aureus subclinical mastitis on mammary quarter milk yield and composition. In order to determine the effects of the pathogen on milk yield and composition at quarter level, a pairwise comparison of infected and non-infected mammary quarters (n = 28) from two dairy herds was carried out. Quarters were individually milked, and milk production and composition were assessed. S. aureus has increased somatic cell counts at quarter level; however, no effect of S. aureus IMI on milk lactose, fat, and protein contents was observed. Fat yield from infected quarters decreased, but losses due to the infection caused by S. aureus were not associated with quarter positioning in cows. (AU)

• Processo FAPESP: 08/05077-3 - Identificação e contagem de agentes causadores de mastite bovina pela reação em cadeia da polimerase
• Beneficiário: Bruno Garcia Botaro
• Modalidade de apoio: Bolsas no Brasil - Doutorado