Necropsy examinations (n = 277) were done on bovine mortalities from three large feedlots in cent... more Necropsy examinations (n = 277) were done on bovine mortalities from three large feedlots in central Saskatchewan and a gross diagnosis was made. Tissue samples from the heart, lung, ileum and skin were collected for each necropsy and submitted for histopathological (HP) and immunohistochemical (IHC) examination for BVDV. Joint capsule and exudates were collected and submitted in selected cases. An etiological diagnosis of mortality was made and results were categorized as follows: Bovine virus diarrhea (BVD) 7%, Interstitial pneumonia (AIP) 4%, Mycoplasma bovis associated pneumonia and/or arthritis (MBO) 28%, Digestive tract disease (DIG) 8%, Hemophilosis (HEM) 19%, Bovine respiratory disease (BRD) 17%, Others (OTH) 10%, and Unknown (UNK) 7%. The number of persistently infected (PI) animals in the study was 20, representing 7.2% of all sampled. Immunohistochemical (IHC) examination revealed that 33.1% of all mortality were concurrently infected with BVDV, persistently infected (PI)...
The Canadian veterinary journal. La revue vétérinaire canadienne, 2014
A feedlot steer died suddenly without exhibiting signs of clinical illness. Cysts containing Fasc... more A feedlot steer died suddenly without exhibiting signs of clinical illness. Cysts containing Fascioloides magna were found in the liver and lung. Fatal pulmonary hemorrhage was associated with these flukes. Neither death nor clinical pulmonary disease has been previously attributed to infections of adult cattle by F. magna.
The Canadian veterinary journal. La revue vétérinaire canadienne, 1990
The parenteral administration of the antibiotic tilmicosin given on arrival at a feedlot was eval... more The parenteral administration of the antibiotic tilmicosin given on arrival at a feedlot was evaluated in a group of 304 steer calves. These calves were allotted to 24 pens so that there were 12 replicates of both the control and medicated groups. The treatment rate was reduced significantly during the first five days (p < 0.05) and during the first month (p < 0.01) of the feeding period in the medicated group. The average days from arrival until first treatment for respiratory disease was increased to 21 days in the medicated group compared to 9 days (p < 0.01) for the controls. The medicated group had improved average daily gain (p < 0.01) and feed efficiency (p < 0.01) over the trial period when compared to the nonmedicated animals.
The Canadian veterinary journal. La revue vétérinaire canadienne, 1993
The effect of route and dosage of administration on the serological response to a vaccine contain... more The effect of route and dosage of administration on the serological response to a vaccine containing genetically attenuated leukotoxin of Pasteurella haemolytica combined with bacterial extracts of P. haemolytica and Haemophilus somnus (Somnu-Star Ph, Biostar Inc., Saskatoon, Saskatchewan) was evaluated in a controlled field trial in 301 feedlot calves. Vaccination of calves on arrival at the feedlot with Somnu-Star Ph significantly (p < 0.05) increased P. haemolytica and H. somnus serum antibody titers and reduced bovine respiratory disease (BRD) morbidity. A single subcutaneous vaccination with Somnu-Star Ph was as effective in stimulating a humoral antibody response and in reducing BRD morbidity as double vaccination by the intramuscular or the subcutaneous route. Furthermore, there were no swellings or adverse reactions observed with either subcutaneous or intramuscular administration of Somnu-Star Ph.These results suggest that feedlot calves can be immunized subcutaneously o...
Canadian journal of veterinary research = Revue canadienne de recherche vétérinaire, 1990
A case-study involving 56 randomly selected beef herds in Alberta was conducted to assess the ass... more A case-study involving 56 randomly selected beef herds in Alberta was conducted to assess the association of a number of suspected risk factors upon the odds of a high mortality from diarrhea among calves less than 30 days of age. Using stepwise logistic regression it was found that an increased percentage of heifers calving in the herd, poor drainage in the nursing area, providing limited shelter in the nursing area, a large calving area, and wintering cows and heifers on the same ground were conditionally associated with an increase in the odds of high mortality from neonatal diarrhea.
The Canadian veterinary journal = La revue veterinaire canadienne, 2017
This report describes congenital nuclear cataracts and posterior lenticonus in a closed purebred ... more This report describes congenital nuclear cataracts and posterior lenticonus in a closed purebred Holstein dairy herd in Canada. Ophthalmic examinations were completed on 30 male and 249 female cattle aged newborn to 10 years old. Nutritional, infectious, and toxic etiologies were investigated. Necropsies of 3 affected calves were performed and eyes of 2 additional affected calves were examined with light microscopy. Bilateral nuclear cataracts were identified in 53/279 (19%) animals. Additional congenital anomalies observed included posterior lenticonus, iris to lens persistent pupillary membranes (n = 7), and lenticular colobomata (n = 1). Heifers did not give birth to calves with congenital nuclear cataracts (0/105), whereas the incidence of affected calves born to multiparous cows was 31% (53/171). The animals with nuclear cataracts ranged from newborn to 8 years old. The cataracts appeared to be non- or minimally progressive. Light microscopic examination of 10 affected globes c...
Necropsy examinations (n = 277) were done on bovine mortalities from three large feedlots in cent... more Necropsy examinations (n = 277) were done on bovine mortalities from three large feedlots in central Saskatchewan and a gross diagnosis was made. Tissue samples from the heart, lung, ileum and skin were collected for each necropsy and submitted for histopathological (HP) and immunohistochemical (IHC) examination for BVDV. Joint capsule and exudates were collected and submitted in selected cases. An etiological diagnosis of mortality was made and results were categorized as follows: Bovine virus diarrhea (BVD) 7%, Interstitial pneumonia (AIP) 4%, Mycoplasma bovis associated pneumonia and/or arthritis (MBO) 28%, Digestive tract disease (DIG) 8%, Hemophilosis (HEM) 19%, Bovine respiratory disease (BRD) 17%, Others (OTH) 10%, and Unknown (UNK) 7%. The number of persistently infected (PI) animals in the study was 20, representing 7.2% of all sampled. Immunohistochemical (IHC) examination revealed that 33.1% of all mortality were concurrently infected with BVDV, persistently infected (PI)...
The Canadian veterinary journal. La revue vétérinaire canadienne, 2014
A feedlot steer died suddenly without exhibiting signs of clinical illness. Cysts containing Fasc... more A feedlot steer died suddenly without exhibiting signs of clinical illness. Cysts containing Fascioloides magna were found in the liver and lung. Fatal pulmonary hemorrhage was associated with these flukes. Neither death nor clinical pulmonary disease has been previously attributed to infections of adult cattle by F. magna.
The Canadian veterinary journal. La revue vétérinaire canadienne, 1990
The parenteral administration of the antibiotic tilmicosin given on arrival at a feedlot was eval... more The parenteral administration of the antibiotic tilmicosin given on arrival at a feedlot was evaluated in a group of 304 steer calves. These calves were allotted to 24 pens so that there were 12 replicates of both the control and medicated groups. The treatment rate was reduced significantly during the first five days (p < 0.05) and during the first month (p < 0.01) of the feeding period in the medicated group. The average days from arrival until first treatment for respiratory disease was increased to 21 days in the medicated group compared to 9 days (p < 0.01) for the controls. The medicated group had improved average daily gain (p < 0.01) and feed efficiency (p < 0.01) over the trial period when compared to the nonmedicated animals.
The Canadian veterinary journal. La revue vétérinaire canadienne, 1993
The effect of route and dosage of administration on the serological response to a vaccine contain... more The effect of route and dosage of administration on the serological response to a vaccine containing genetically attenuated leukotoxin of Pasteurella haemolytica combined with bacterial extracts of P. haemolytica and Haemophilus somnus (Somnu-Star Ph, Biostar Inc., Saskatoon, Saskatchewan) was evaluated in a controlled field trial in 301 feedlot calves. Vaccination of calves on arrival at the feedlot with Somnu-Star Ph significantly (p < 0.05) increased P. haemolytica and H. somnus serum antibody titers and reduced bovine respiratory disease (BRD) morbidity. A single subcutaneous vaccination with Somnu-Star Ph was as effective in stimulating a humoral antibody response and in reducing BRD morbidity as double vaccination by the intramuscular or the subcutaneous route. Furthermore, there were no swellings or adverse reactions observed with either subcutaneous or intramuscular administration of Somnu-Star Ph.These results suggest that feedlot calves can be immunized subcutaneously o...
Canadian journal of veterinary research = Revue canadienne de recherche vétérinaire, 1990
A case-study involving 56 randomly selected beef herds in Alberta was conducted to assess the ass... more A case-study involving 56 randomly selected beef herds in Alberta was conducted to assess the association of a number of suspected risk factors upon the odds of a high mortality from diarrhea among calves less than 30 days of age. Using stepwise logistic regression it was found that an increased percentage of heifers calving in the herd, poor drainage in the nursing area, providing limited shelter in the nursing area, a large calving area, and wintering cows and heifers on the same ground were conditionally associated with an increase in the odds of high mortality from neonatal diarrhea.
The Canadian veterinary journal = La revue veterinaire canadienne, 2017
This report describes congenital nuclear cataracts and posterior lenticonus in a closed purebred ... more This report describes congenital nuclear cataracts and posterior lenticonus in a closed purebred Holstein dairy herd in Canada. Ophthalmic examinations were completed on 30 male and 249 female cattle aged newborn to 10 years old. Nutritional, infectious, and toxic etiologies were investigated. Necropsies of 3 affected calves were performed and eyes of 2 additional affected calves were examined with light microscopy. Bilateral nuclear cataracts were identified in 53/279 (19%) animals. Additional congenital anomalies observed included posterior lenticonus, iris to lens persistent pupillary membranes (n = 7), and lenticular colobomata (n = 1). Heifers did not give birth to calves with congenital nuclear cataracts (0/105), whereas the incidence of affected calves born to multiparous cows was 31% (53/171). The animals with nuclear cataracts ranged from newborn to 8 years old. The cataracts appeared to be non- or minimally progressive. Light microscopic examination of 10 affected globes c...
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