Infectivity of equine H3N8 influenza virus in bovine cells and calves.

Background: Serological evidence for influenza A, subtype H1 and H3 virus infections of bovines, associated with respiratory disease and decreased milk production, has been reported. Equine H3N8 influenza virus circulates widely and was responsible for the introduction of H3N8 influenza into canines.

Objective: To explore the possibility that equine H3N8 influenza might also infect bovines.

Livestock producers' views on accessing food-animal veterinary services: implications for student recruitment, training, and practice management.

Nationally, shortages of food-animal veterinary practitioners have been projected over the next several years. The purpose of this study was to ascertain livestock producers' perceptions on access to veterinary services and to measure opinions on potential solutions to access problems. Data for the study were from a 2006 survey of livestock producers in Tennessee.

Changes in antibiotic susceptability of Escherichia coli isolated from steers exposed to antibiotics during the early feeding period.

The influence of therapeutic choices on antibiotic resistance of intestinal bacteria may have food safety consequences. Changes in antibiotic susceptibility of Escherichia coli to antibiotics currently approved for prevention and treatment of bovine respiratory disease were evaluated in 260 feedlot steers. Susceptibilities to antimicrobial compounds were compared among three treatment groups at three times between arrival at the feedlot and harvest to assess changes over the course of the feeding period.

Influence of extracellular matrix on bovine mammary gland progenitor cell growth and differentiation.

Objective: To examine the impact of simple versus complex extracellular matrices (ECMs) on morphologic development and differentiation of bovine mammary gland progenitor cells (BMGPCs).

Sample Population: Cultures of BMGPCs.

Procedures: BMGPCs were grown on the following extracellular matrices: collagen I, collagen IV, laminin, and a commercially available gelatinous protein mixture.

Genetic diversity of Cryptosporidium spp. in cattle in Michigan: implications for understanding the transmission dynamics.

Epidemiological and molecular data on 248 bovine, 17 human, and 16 water samples of Cryptosporidium spp. collected from the lower peninsula of Michigan between 1997 and 2000 were analysed. Cryptosporidium parvum bovine genotype and Cryptosporidium andersoni were found in 56 and four cattle samples, respectively.

Isolation and differentiation of bovine mammary gland progenitor cell populations.

Objective: To isolate bovine mammary gland cells with stem cell characteristics.

Sample Population: Monolayers of bovine mammary gland cells.

Procedure: Mammary gland cell populations were separated by use of selected media supplements.

Caspase activation in equine influenza virus induced apoptotic cell death.

Equine influenza virus (EIV) is the leading cause of acute respiratory infection in horses worldwide. In recent years, the precise mechanism by which influenza infection kills host cells is being re-evaluated. In this report, we examined whether caspases, a group of intracellular proteases, are activated following EIV infection and contribute to EIV-mediated cell death.