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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Influence of pathogens causing clinical mastitis on reproductive variables of dairy cows

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Dalanezi, F. M. [1] ; Joaquim, S. F. [1] ; Guimaraes, F. F. [1] ; Guerra, S. T. [1] ; Lopes, B. C. [1] ; Schmidt, E. M. S. [2] ; Cerri, R. L. A. [3] ; Langoni, H. [1]
Total Authors: 8
[1] Sao Paulo State Univ UNESP, Fac Med Vet & Anim Sci, Dept Vet Hyg & Publ Hlth, BR-18168681 Botucatu, SP - Brazil
[2] Sao Paulo State Univ UNESP, Fac Med Vet & Anim Sci, Dept Vet Clin Sci, BR-18168681 Botucatu, SP - Brazil
[3] Univ British Columbia, Fac Land & Food Syst, Appl Anim Biol, Vancouver, BC V6T 1Z4 - Canada
Total Affiliations: 3
Document type: Journal article
Source: JOURNAL OF DAIRY SCIENCE; v. 103, n. 4, p. 3648-3655, APR 2020.
Web of Science Citations: 0

In dairy cattle, mastitis is a disease of the mammary gland caused by pathogens such as bacteria, viruses, fungi, and algae. Mastitis causes economic losses to dairy farms as well as public health concerns. The reproductive efficiency of commercial dairy herds has important implications for the economic success of dairy operations and is strongly associated with the health status of cows. Mastitis has previously been linked with decreased fertility of dairy cows, but the effect of specific pathogens on the severity of fertility reduction is still unclear. In this study, cows diagnosed with mastitis caused by major pathogens (Staphylococcus aureus, Streptococcus agalactiae, Escherichia coli, Klebsiella spp., Mycoplasma spp., and environmental Streptococcus) needed more artificial inseminations (AI) than did cows with mastitis caused by minor pathogens (coagulase-negative Staphylococcus and Corynebacterium spp.) and healthy cows. Cows diagnosed with mastitis, independent of what pathogen was causing mastitis, had more days open compared with nonmastitic cows. The percentage of cows that successfully established pregnancy at first AI was greater for the control group than for the major pathogens group but not significantly different from the minor pathogens group. Pregnancy loss was lower in the control group than in the major pathogens group; however, there was no difference compared with the minor pathogen group. Mastitis caused by gram-negative bacteria decreased the percentage of pregnancy per first AI and increased days open and pregnancy loss compared with the control group. Cows with mastitis caused by gram-positive bacteria also had increased days open compared with control cows. This study shows that different mastitis-causing bacteria can affect the fertility of cows differently. Mastitis events caused by major pathogens and gram-negative bacteria were associated with the greatest decrease in reproductive efficiency. (AU)

FAPESP's process: 15/26055-1 - Influence of pathogens causing clinical mastitis in dairy cows reproductive indices
Grantee:Felipe Morales Dalanezi
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 15/19688-8 - E. coli, Klebsiella pnemoniae and Enterococcus spp: impact of virulence factors in bovine mastitis and public health concern
Grantee:Helio Langoni
Support type: Research Projects - Thematic Grants