Rotaviruses are accepted as enteric pathogens of calves but many natural infections are subclinical. In the present paper, the outcome of inoculation of gnotobiotic calves of three ages (the second day of life, the second week of life and calves aged 6 weeks and over) with doses of 10(5.0) to 10(6.5) TCID50 was compared for three bovine rotavirus isolates (C3-160, 17/4 and 39/58). The clinical ...

In the summer of 1996, we screened 18,931 calves in 128 beef herds located in five US states for persistent bovine viral diarrhea virus (BVDV) infection. Of these, 76 herds were randomly selected from the client database of collaborating veterinary practices, and 52 herds were suspected by the collaborating veterinarians to have BVDV infection based on history or clinical signs. Serum was obtai...

The in situ expression of intercellular adhesion molecule-1 (ICAM-1) mRNA in normal and pneumonic lung tissues of Holstein calves with bovine leukocyte adhesion deficiency (BLAD) was compared with that of age-matched non-BLAD Holstein calves by in situ hybridization. Twenty-four Holstein calves (both BLAD and non-BLAD) were randomly assigned to one of two experimental groups and inoculated intr...

A 1:1 matched case-control study of calves under 1 month of age was carried out by weekly visits to 7 dairy farms in Mashhad from May 2008 to October 2008. Fecal samples were collected from a total of 112 calves with clinical signs of diarrhea and from 112 matched animals without clinical signs of diarrhea as assessed by a scoring system. The samples were investigated for the presence of Rotavi...

the purpose of this study was to evaluate the changes in the serum concentrations of haptoglobin (hp), serum amyloid a (saa) and igg, iga in calves with diarrhea caused by rotavirus, coronavirus, escherichia coli f5 and eimeria species. the experiment was carried out on 40 diarrhoeic and 10 non-diarrhoeic calves (group c). a total of 13 calves were infected with rotavirus or coronavirus (group ...

the aim of this study was to compare conventional and organic diets in beef production. thirty-two dairy beef calves were used in 4 treatments: organic diet with three levels of forage [70% of organic diet with high amount of forage (orh), 55% of organic diet with medium amount of forage (orm), 38% of organic diet with low amount of forage(orl)] and conventional diet (con). the dry matter intak...

We determined regional myocardial blood flow (15-micrometer tracer microspheres) and hemodynamics in nine normal calves, seven calves with right ventricular (RV) hypertrophy induced by pulmonary artery banding (PAB) at sea level, and five calves exposed to simulated high altitude (HA) of 3,500 m (PB = 500 mm Hg) for 8--10 weeks. Progression of RV hypertrophy was very rapid in HA calves. RV weig...

cryptosporidiosis is a widespread cause of diarreheal diseases of humans, young calves, and many mammals caused by infection of intestinal epithelial cells with the protozoal agent cryptosporidium. this study that was conducted in shahriar county of tehran in 2006, altogether 573 stools of calves and 867 stools from diarreheal humans refer to hospitals of county were collected and concentrated ...

OBJECTIVE To determine effects of the selectin inhibitor TBC1269 on neutrophil-mediated pulmonary damage during acute Mannheimia haemolytica-induced pneumonia in newborn calves. ANIMALS Eighteen 1- to 3-day-old colostrum-deprived calves. PROCEDURE Mannheimia haemolytica or saline (0.9% NaCl) solution was inoculated in both cranial lung lobes of 12 and 6 calves, respectively. Calves were eut...

We investigated the effect of supplemental vitamin E on antibody titer against bovine herpesvirus-1 (BHV-1) in Japanese Black calves after vaccination with modified live virus. Thirty calves kept at the same farm were studied. They were divided into two groups; fifteen calves received 300 IU/day of vitamin E orally from 1 to 3 months of age (VE Group), and the other fifteen calves did not recei...