University of Veterinary Science

About: University of Veterinary Science is a education organization based out in Pyinmana, Myanmar. It is known for research contribution in the topics: Population & Receptor. The organization has 597 authors who have published 650 publications receiving 14262 citations.

Relationship between thyroid function and seasonal reproductive activity in mares.

Abstract: The relationship between thyroid function and seasonal reproductive activity in mares was investigated by comparing plasma triiodothyronine and thyroxine concentrations in anoestrous mares and in mares with cyclic ovarian activity during the anovulatory season. In study 1, the diurnal changes in plasma triiodothyronine and thyroxine concentrations on a single day were compared in anoestrous and cyclic mares. The mean thyroxine concentrations were significantly higher (P < 0.001) in the cyclic mares than in the anoestrous mares, whereas mean triiodothyronine concentrations were similar in both groups. In study 2, plasma thyroid hormone concentrations were monitored in mares that foaled before the vernal equinox. Nine mares resumed cyclic ovarian activity shortly after parturition and ten mares remained in anoestrus. Mean plasma triiodothyronine and thyroxine concentrations were significantly lower in the first 60-90 days after foaling in the mares undergoing anoestrus than in the mares undergoing normal ovarian activity after parturition (P < 0.001). In these mares, the increases in triiodothyronine and thyroxine concentrations were associated with the first ovulation after parturition. In study 3, thyroid hormone concentrations were monitored in adult (n=14) and young (n=14) mares. Mean thyroxine concentrations were significantly lower in adult anoestrous mares during the anovulatory period than in cyclic mares and in anoestrous mares before and after the anovulatory period (P < 0.01). Mean plasma triiodothyronine concentrations were also significantly lower (P < 0.001) in anoestrous mares from December until March. There were no significant differences between the plasma triiodothyronine and thyroxine concentrations in young cyclic and anoestrous mares. This relationship between thyroid function and expression of seasonal reproductive activity does not indicate that the thyroid gland is involved in the control of seasonality in horses. The decreased triiodothyronine and thyroxine concentrations in anoestrous mares may be the result of a hypothalamic control similar to that described for seasonal reproductive activity.

Two-dimensional echocardiographically guided pericardiocentesis in a horse with traumatic pericarditis.

Abstract: Two-dimensional echocardiographic (2DE) examination was performed on a horse with clinical signs of pericardial effusion. Thickening of the pericardium, excess amount of pericardial fluid, elevation of the cardiac apex, and right ventricular compression, characteristic of cardiac tamponade, could be seen on 2DE recordings. Fibrinous pericarditis was suspected by observation of fibrinous strands in the pericardial fluid and epicardial fibrin deposits. Echocardiographically guided pericardiocentesis was performed, and 4 L of fluid was removed from the pericardial sac. Streptococcus zooepidemicus was isolated from the fluid. Pericardiocentesis was repeated for 3 days, and medication was administered. Despite temporary improvement in cardiac function, the horse's condition deteriorated gradually, and euthanasia was performed on the ninth day of hospitalization. Necropsy revealed chronic serofibrinous pericarditis of traumatic origin, attributable to an intercostal stab wound entering the pericardium and the apical portion of the myocardium.

Treatment of calf pneumonia with tilmicosin.

Abstract: The therapeutic effect of a single injection of tilmicosin (10 mg/kg body mass) against natural cases of pneumonia of calves, compared to other conventionally used antibiotics, was examined under field conditions. The trials were conducted in three cattle herds and included the treatment of 135 calves with 82 controls. The animals' age ranged from 1 week to 4 months. Prior to the treatment and in case of death bacteriological examinations from nasal swabs and from the lungs were carried out. Clinical signs were recorded in all groups and in one group body mass gains were also recorded. After tilmicosin treatment, the body temperature returned to the normal level within 24 h and the animals recovered within 1 to 2 days. Ten calves (7.41%) showed relapse during the 3rd and 4th week after treatment in contrast to 9 (10.98%) in the control group. Three calves (2.22%) died in the groups treated with tilmicosin and 6 calves (7.32%) among the controls. In one of the treated groups the body mass gain was 6.2% higher compared to the controls at the age of 3 months. These results suggest that treatment with a single dose of tilmicosin is effective in most cases of calf pneumonia caused by bacteria.