The purpose of this study was to determine the prevalence of bovine leukemia virus (BLV) in Khorasan Razavi and Khorasan Shomali provinces which are the main provinces located in the northeast of Iran. Total number of 429 blood samples were collected from industrial dairy herds. The samples were categorized based on province, age (2-3, 4-6, and 7-10 years old), calving (≤ 2, 3-5, and > 5) and h...

The objective of this review is to describe recent research findings related to the use of milk or blood urea nitrogen to identify inefficiencies in protein nutrition and estimate nitrogen excretion. A mathematical model was developed to integrate milk urea nitrogen (MUN) and milk composition to predict urinary and fecal excretion, intake, and utilization efficiency for nitrogen in lactating da...

Staphylococcus aureus is one of the most common causes of mastitis in US dairy herds. It is a major source of expense and lost revenues on many dairies. Therefore, the mastitis control program on every dairy must include measures designed to limit the degree and spread of Staph aureus infections. As herds grow larger, it becomes even more critical that these control programs are designed carefu...

A cross-sectional study was carried out in spring 2007, at the end of the first bluetongue outbreak season, to determine the geographical spread of bluetongue virus serotype 8 (btv-8) infection in cattle in the Netherlands and the consequences for some production parameters. Blood samples from cattle submitted to the laboratory of the Dutch Animal Health Service for other voluntary and obligato...

BACKGROUND The south of Chile constitutes the main cattle milk producing area of the country. Regarding leptospirosis control in Chile, there is neither an official program nor an epidemiological characterization of smallholder dairy farms. This study was carried out to determine Leptospira seroprevalence and to evaluate risk factors associated with seropositivity at herd level in smallholder b...

BACKGROUND Pre-recorded register data from dairy herds are available in almost all Nordic countries. These databases can be used for research purposes, and one of the research areas is animal welfare. The aim of this study was to investigate if pre-recorded register data could be used to identify herds with good welfare, and to investigate if a combination of register data sets could be used to...

BACKGROUND Infections with bovine herpesvirus 1 (BoHV-1) and bovine viral diarrhoea (BVD) virus cause diseases of cattle with a worldwide distribution. The primary objective of the present study was to describe aspects of herd-level BoHV-1 and BVDV seroprevalence (based on testing of pooled sera) and control on farms in Northern Ireland, including vaccine usage. An indirect antibody ELISA test ...

background: q fever is a zoonosis disease caused by an obligate intracellular organism coxiella burnetii. raw milk or dairy products that are produced by unpasteurized milk may contain virulent coxiella burnetii. the objective of this study was to determine the prevalence rate of c. burnetii in bulk milk samples from dairy sheep herds in fars, ghom, kerman, khuzestan and yazd provinces, iran. m...

Peter T. Thomsen1,2, Tine Rousing1, Jan Tind Sørensen1 & Anne Mette Kjeldsen3 Danish Institute of Agricultural Sciences, Department of Animal Health and Welfare, Research Centre Foulum, P.O. Box 50, DK-8830 Tjele, Denmark, The Royal Veterinary and Agricultural University, Department of Animal Science, Grønnegårdsvej 8, DK-1870 Frederiksberg C, Denmark, Danish Cattle Federation, Udkærsvej 15, Sk...

Delayed conception is defined as an interval of greater than 90 days postpartum before a cow becomes pregnant again. In this study, the risk factors for delayed conception in Korean dairy herds were determined by evaluating several reproductive factors in individual cows. The following data was recorded from 1,012 pregnancies in eight dairy herds (designated A-H) from July 2001 to June 2006: he...