جستجوی مقالات مرتبط با کلیدواژه "holstein calves" در نشریات گروه "دامپزشکی"

A four-month-old female Holstein calf was presented to the Veterinary Teaching Hospital of Urmia University with a history of abnormal hairy growth on the right eye since birth.

Clinical Findings:

- On general examination, the animal was alert. Body temperature, heart rate, respiratory rate, menace test, and pupillary light reflex were normal. On ophthalmic examination, a hairy mass was observed on the conjunctivae, third eyelid, sclera, and cornea of the right eye. Histopathological examination revealed the mass with three distinct areas of skin. It was diagnosed as an ocular dermoid cyst and surgical treatment was warranted. Treatment and Outcome- The mass was surgically excised to prevent damage to the anterior chamber of the eye. Ocular healing was satisfactory in a 4 week follow up.

This report described an ocular dermoid cyst in a four-month Holstein calf. There was just lacrimation, possibly due to irritation caused by the hairs. The ocular dermoid cyst could be excised surgically, and the prognosis is good.

Glucocorticoids are the steroidal drugs which are very widely used in large animal medicine. These agents have advantages in large animals but they have been also associated with many potential adverse effects especially at high doses or prolonged use.
The present experimental study was designed to clarify the effects of dexamethasone (DEXA) and isoflupredone (ISO), as the most common glucocorticoids in large animal medicine, on bovine thyroid hormones.
Ten clinically healthy Holstein calves (6-8 months old) were assigned into 2 equal groups. Dexamethasone (1 mg/kg) and isoflupredone (1 mg/kg) were administered intramuscularly in DEXA and ISO groups, respectively, for two consecutive days. Blood samples were taken at days 0 (before the 1st dose), 1 (before the 2nd dose), 2, 3, 5 and 7, from all studied animals and serum concentrations of T3, T4, fT3 and fT4 were determined in all specimens.
Levels of T3 and T4 were decreased significantly after both drugs administrations. The concentrations of T3 and T4 in Iso group were significantly lower than DEXA one (P Pharmacological doses of dexamethasone and isoflupredone have suppressive actions on the circulating levels of thyroid hormones in Holstein calves possibly via inhibition of TSH production at hypothalamic-pituitary-thyroid level.

Glucocorticoids have several benefits in large animal medicine but apart from their benefits, there are several disadvantages attributed to the use of these drugs. Among the disadvantages, disturbance in protein metabolism is one of the side effects of glucocorticoids which has been investigated in human and laboratory animals. There are no information regarding the effects of glucocorticoids on protein metabolism in large animals. Hence, the present experimental study was performed to evaluate the protein metabolism following glucocorticoids administration in Holstein calves. Ten clinically healthy Holstein calves (6 to 8 months old) were assigned into 2 equal groups (n=5), containing Dexa and Iso. Dexamethasone (1 mg/kg, intramuscularly) and isoflupredone(1 mg/kg, intramuscularly) were administered in Dexa and Iso groups, respectively, on two consecutive days. Blood samples were taken at days 0 (1st drug administration), 1 (2nd drug dministration), 2, 3, 5 and 7, from all studied animals. Sera were assayed for total protein, albumin, globulin, serum amyloid A and haptoglobin. Serum amyloid A and haptoglobinexperience significant increase after administration of both drugs. Isoflupredone induced the synthesis of serum amyloid A and haptoglobin more than dexamethasone (p<0.05). Serum concentrations of total protein, albumin and globulin experienced significant decrease after infusion of dexamethasone and isoflupredone (p<0.05). Circulating levels of these proteins in Iso group were lower than Dexa one, significantly. Isoflupredone and dexamethasone can induce the protein catabolism. Furthermore, the concentrations of serum amyloid A and haptoglobin, as oxidative stress biomarkers, increased following both drugs administrations due to their oxidation effects on proteins. Finally, the effects of isoflupredone on the metabolism of proteins are significantly higher than dexamethasone in Holstein calves.