Morphometric and steroid hormone changes associated with experimental anovulatory follicles in the sow.

Steroid levels and ovarian follicular morphology were examined in sows on days 19 and 26 (day 5 of next cycle) after injection of adrenocorticotropic hormone (ACTH) or dexamethasone (DXM). Five sows received DXM (30 micrograms/kg bodyweight, intramuscularly) at 12 h intervals from days 9 to 14. Another five sows were given ACTH (2 IU/kg bodyweight, intramuscularly) from day 17 to day 19 or the end of estrus.

"mdx" mouse myopathy: histopathological, morphometric and histochemical observations on young mice.

Histopathological examination of tibialis anterior (TA) and lateral gastrocnemius (LG) muscles from "mdx" mice sometimes revealed lesions of calcification and the close proximity of degenerative lesions with regenerative changes. Morphometric examinations showed that the TA was more severely affected than the LG in mice of all age groups. The soleus muscle was less severely affected than the TA in very young mice, but appeared to be affected almost as severely as the TA in older mice.

Scanning and transmission electron microscopic studies on the oviducts of Pekin ducks fed methyl mercury containing diets.

This study was undertaken to examine the effects of varying levels of methyl mercury (MeHg) on the ultrastructure of the surface epithelium of the oviduct of ducks. Accordingly, Pekin ducks were maintained on feed containing varying doses of (0.0; 0.

Copper-induced myopathy in rabbits: ultrastructural observations.

Mature rabbits were injected intra-muscularly into the hamstring (HS) muscles with doses of 1.66 mg Cu/kg/day, as cupric acetate, in aqueous solution. Similar doses of Na acetate were injected into control rabbits.