Aplasiaof adrenohypophysis
-Guernsey and Jersey cattle (Genetic)
-lack of fetal pituitary trophichormones
-hypoplasiaof target endocrine glands
2. Pituitary dwarfismin dogs
-failure of the oropharyngealectoderm of Rathke’s
pouch to differentiate into tropic hormone-secreting
cells of the pars distalis
-Juvenile panhypopituitarism: German shepherd
Dwarf pups:slower growth,
retention of puppy hair coat,
bilaterally symmetrical alopecia