The aim of this study was to examine virulence factors and the ability of S. aureus and CNS species isolated from milk of cows with mastitis to form biofilm, and to compare them with virulence factors of staphylococci from milk of cows without mastitis and cowshed environment. Most of S. aureus strains from cows with mastitis showed haemolytic activity (93.9%), among them 72.7% and 21.2% produc...

background: mastitis is an important health disorder in dairy herds which affects milk production, animal reproduction and production. objectives: the aim of this study was to estimate the cumulative incidence of mastitis in dairy herds in tehran province.  methods: from 679 dairy herds in tehran province that have more than 50 animals, 32 dairy herds were selected randomly and animals that had...

Milk samples were collected from quarters of 35 cows with subclinical mastitis (California mastitis test [CMT] positive and somatic cell counts [SCC] >500,000 cells/ml in individual quarter foremilk), as well as from 37 healthy controls. Compared to the levels observed in milk from healthy quarters, milk from quarters with subclinical mastitis showed elevated sodium (91.97 vs 52.93 mg/dl), chlo...

BACKGROUND The dairy industry has undergone substantial structural changes as intensive farming has developed during recent decades. Mastitis continues to be the most common production disease of dairy cows. Nationwide surveys of mastitis prevalence are useful in monitoring udder health of dairy herds and to study the impact of structural changes on the dairy industry. This survey on bovine sub...

BACKGROUND The mastitis subclinical and clinical in cows caused by fungi has been increased specially by yeast of the genus Candida. OBJECTIVE To identify what yeasts were present in milk samples obtained from mammary glands of healthy cows, and others suffering subclinical or clinical mastitis. METHODS From a total of 1,095 milk samples 342 were from mammary glands of healthy dairy cows, 3...

Coagulase-negative staphylococci (CNS) have become the most common bovine mastitis isolate in many countries and could therefore be described as emerging mastitis pathogens. The prevalence of CNS mastitis is higher in primiparous cows than in older cows. CNS are not as pathogenic as the other principal mastitis pathogens and infection mostly remains subclinical. However, CNS can cause persisten...

Abstract The study objective was to evaluate health, performance, and antimicrobial costs of heifers where targeted metaphylaxis guided by a commercial blood leukocyte analyzer compared traditional regimen. Using randomized complete block design, (n=1,271; initial body weight (BW) = 233.3±1.08 kg) were randomly allocated treatment pens (n=20; 10 blocks). Treatments were: 1) cattle administered ...

Mastitis in dairy herds can usually be brought under control by following the basic Program of the National Mastitis Council. Two points of this Program involve the use of antibiotics, one to treat clinical mastitis and the other to treat cows at the beginning of the nonlactating period. Antibiotic therapy, without identifying the mastitis causing organisms, is frequently the veterinarian and d...

Therapeutic efficacy of mastitis can result in frustrating clinical outcomes, depending on the causative pathogen, the severity and duration of infection, and expectations of the dairy producer. In herds that have controlled contagious mastitis, costs incurred from clinical mastitis likely account for the largest proportion of total herd mastitis costs, and in some instances, a majority of thes...

Mastitis in dairy cows is among the most important diseases of dairy cattle worldwide. Mastitis is most often the response of the host to an intramammary infection. Accurate and cost-effective methods of identifying mastitis pathogens are important for the diagnosis, surveillance, and control of this economically important disease. Rapid identification methods have the potential to be extremely...