AIM A cross-sectional study was conducted to estimate the prevalence and associated risk factors of mastitis in dairy cows. MATERIALS AND METHODS A total of 302 dairy cows were selected from all volunteer dairy farms in Ambo district of West Shewa Zone, Oromia region. Thorough clinical examination was made on all lactating cows for evidence of signs of clinical mastitis followed by collection...

BACKGROUND AND AIM There are global public health and economic concerns on chemical residues in food of animal origin. The use of antibiotics in dairy cattle for the treatment of diseases such as mastitis has contributed to the presence of residues in dairy products. Penicillin residues as low as 1 ppb can lead to allergic reactions and shift of resistance patterns in microbial population as we...

Invasions of gastrointestinal nematodes in dairy cows may affect animals productivity. The most frequently detected internal parasite of dairy cattle is Ostertagia ostertagi. The objective of this study was to determine O. ostertagi invasion extensiveness in selected herds of dairy cattle, with special consideration to cows being in the first lactation, and to analyze the milk yield and content...

Bovine mastitis is an important and complex disease responsible for economic losses in the dairy industry. Biotype II strains of the green alga Prototheca zopfii can be involved, most often resulting in chronic mastitis of difficult treatment associated with reduced milk production. This type of infection is rare, but the number of reported cases is increasing worldwide. In order to determine t...

Mastitis is an inflammation of the mammary gland initiated by pathogenic bacteria. In fact, mastitis second most important reason for culling cows from dairy herds, after infertility. this review we focus on various forms mastitis, including subclinical and clinical mastitis. We also stress importance dry-off period as time when bacteria might start their insult to gland. An part negative effec...

Mastitis is a significant disease of adult dairy cattle affecting up to 40 percent of cows within a herd at any given time. Recent surveys show that udder health problems are consistently the most frequent cause of morbidity with the US dairy cattle population (Table 1). The U.S. dairy industry loses an estimated $2 billion every year due to mastitis, with reduced milk production accounting for...

Mastitis is a common disease in dairy cows. The majority of the cases are subclinical, and many of those are due to infection with coagulase-negative staphylococci (CNS). CNS is a heterogeneous group of bacteria consisting of a large number of different species, but limited information is available on the epidemiology of mastitis due to these species. The overall aim of the thesis was to improv...

BACKGROUND The objectives of this study were to investigate whether there were differences between Norwegian Red cows in conventional and organic farming with respect to reproductive performance, udder health, and antibiotic resistance in udder pathogens. METHODS Twenty-five conventional and 24 organic herds from south-east and middle Norway participated in the study. Herds were matched such ...

Mastitis is the most common and costly disease of dairy cows (Hortet and Seegers, 1998; Zafalon et al., 2007); this is also the single most common reason for antimicrobial use in dairy herds, since antimicrobial therapy is the major primary tool for mastitis control in lactating and dry cows. Recently, coagulase-negative Staphylococci (CNS) are increasing in importance as cause of bovine intram...