Streptococcus agalactiae , S. dysgalactiae and S. uberis are Gram-positive bacterial pathogens that affect cows in dairy herds. These are considered as the major causes of economic losses of dairy producers without a control program. To reveal the role of these agents in inducing subclinical mastitis in dairy cattle in Ahvaz, 100 CMT-positive milk samples and 20 CMT-negative milk samples were c...

Mastitis is the more economically important disease in dairy herds. Costs originated by this disease are not only those related to lost of milk production, treatment of sick animals or culled cows, but also those related with the prevention of this disease. Intramammary infections (IMI) are most of the times caused by infection with bacterial pathogens that could be divided into contagious or e...

Data from a prospective longitudinal study carried out from 1986 to 1990 in 47 commercial Holstein dairy herds from western France were used to quantify the effects of udder health disorders on the risk of culling. Logistic regression was used to assess the relationship between 4 udder health disorders and early and late culling. Teat injuries were associated with an increased risk of early cul...

As livestock production systems have changed to intensive commercial structures meet the increasing demand for animal-based products, there has been an increase in food diseases, subsequently resulting animal welfare issues. After mastitis and infertility, lameness is one of three major issues affecting dairy cattle globally, reduced productivity, economic losses, problems. Lameness associated ...

Bovine herpesvirus-4 (BHV-4), genus Rhadinovirus, is a member of the family Herpesviridae, subfamily Gammaherpesvirinae with a worldwide distribution. This study was conducted to investigate the role of the virus in mastitis and/or subclinical mastitis in the Canadian dairy herds.Milk samples from 176 dairy cows were divided into 2 main groups; “A” contained samples with no bacterial isolates, ...

Mastitis, an inflammation of the mammary gland, is the most widespread health problem of dairy cows, goats and sheep (Bačić et al. 2015., Mačešić et al. 2012). Its prevention and treatment contribute to significant financial loss to the milk producers. New research shows that the total loss due to clinical mastitis in dairy cows is estimatedbetween 110 and 550 litres of milk per lactation, depe...

Over the past thirty-five years, milk production has dramatically increased in Western Europe and North-America. Producers attempt to increase milk yield as a means an increase profitability. However, several studies have demonstrated that high-producing cows are at increased risk of infectious diseases (Grohn et al., 1994). Among those diseases, clinical mastitis is the most costly disease of ...