After calling the college, I finally got a copy of the necropsy report emailed to me. A lot of what is in here is not what was said during the phone call after the Vet had finished the necropsy and right now I don't know what to think. I'll put it here and maybe you can get something out of it that I may be missing.
Species: Avian,Chicken
Black Jersey Giant hen, 22 weeks old, died Friday, Sept 21; arrived at the lab via mail on Sept. 26, necropsy on Sept. 27. body weight 1.5 lbs.; skin in the abdominal area was green-blueish discolored.
Breast muscles were thin and keel bone was prominent but firm and straight. Feathers below the vent were moderately soiled with fecal matter and urates.
The leg bones were firm and the feet clean. The beak was prominent. There was some mucus in the nasal passages.
Remnants of the thymus gland and bursa of Fabricius were of normal size for this age.
Cervical nerves, brachial, lumbar, sciatic plexus, Remaks and sciatic nerve showed no gross abnormalities.
Size and shape of the liver was normal. There was a small, lentil sized nodule on the ventral margin of the left liver lobe.
The spleen was slightly enlarged (in relation to the size of the bird) and mottled and pale. The ovary was underdeveloped for this age. The kidney was pale brown with no apparent lesions.
There a small amount of mucus in the trachea and bronchial bifurcation. The lungs were of normal pink color, but slightly edematous. There was one pinhead sized pale spot in the right lobe with a 1 mm wide reddish ring around it.
The bone marrow in the femur was pale.
There were no apparent lesions in the esophagus. The crop was filled with yellowish slightly moist mash resembling chicken feed. The lining of the esophagus, crop, and proventriculus was w/o apparent lesions. There was little feed in the gizzard and some grit pebbles.
The pancreas showed no apparent lesions.
The abdominal cavity was filled will rather large, moist and distended intestines and the wall of the mid section small intestines was reddish discolored. The intestines contained a moderate amount of mucus and small amount of undigested feed. The mucus of the midsection of the small intestines was of reddish color and contained a moderate to high amount of coccidia oocysts and some irregular crystals.
Summary of the Findings:
Intestinal coccidiosis
Anemia
No lesions suggestive of Marek’s disease
Severe retardation and loss of muscle mass
Conclusions:
None of the gross pathological lesions, including the coccidiosis, can fully explain the extremely severe retardation of the body size of the bird.
Marek’s disease was not the cause of death or retardation.
Drug overdosing may be a factor in the anemia.
Nutrient imbalance or deficiency in the feed may be a factor (feed sample analysis is recommended).
Other advices:
1. use of any vaccine other than Marek’s vaccines should be discontinued..
2. Use Chick starter feed medicated feed for 8 weeks; chick grower feed with 14 to 16% protein and coccidiosis medication up to 16 weeks and non-medicated feed thereafter.
3. Make sure feed and water is available ad lib for growing birds
4. Cull severely retarded birds. They will not catch up even under best circumstances and will remain seeders of problems, such as coccidia oocysts, because of their lower immune defenses.