NEOPLASTIC DISEASES IN CHICKENS 



15 



of an egg, as a misshapen egg was found in the oviduct. The period between the 

 last egg laid and necropsy did not seem to be affected either by the type or by the 

 extent of the disease. 



Table 10. — Dal-^ on Egg Production of Chickens with Lymphocytoma. 



Productive life is the interval between first and last eggs laid. Production 

 index is the factor obtained by dividing the number of eggs laid by the productive 



life in da vs. 



T 2104 



T 13 75 



T 124 



T 43 

 T 168 



Form of Tumor — Diffuse 



K 306 



D 379 



D 354 

 K 253 



K 345 

 D 338 



K 268 



28 

 116 

 2 

 173 

 176 



63 



.596 

 .552 

 .667 

 .520 

 .863 

 .074 



39 



73 

 44 

 44 

 4 

 13 



Liver 4, intestine 4 



Peritoneurn 4 



Ovary 3, heart 3. marrow 3 



Skin and subcutis 4 



Bursa of Fabricius 4 



Ovary 4, liver 2, kidney 2, 

 lung 3, adrenal 2, periton- 

 eum 1, nerve in 4 sites 



Ovary 4, peritoneum 4, ad- 

 renal 4, pancreas 3, intes- 

 tine 2, nerve in 2 sites 



108 



Form of Tumor— 



67 .62C 



Nodular 



40 



Liver 4, spleen 4, kidney 2, 

 marrow 1 



Form of Tumor — Diffuse and Nodular 



122 

 34 



79 

 129 



89 

 16 



52 

 43 



.730 

 .470 



.659 

 .333 



.678 



21 



47 

 35 



30 



Liver 1, kidney 1, peritoneum 

 1, Bursa of Fabricius 4 



Liver 3, kidney 4, marrow 2, 

 adrenal 1 



Liver 4, spleen 3. kidney 3 



Ovary 4, kidney 4, adrenal 4, 

 musculature 3, heart 3, 

 lung 2, spleen 1 



Ovary 3, skin and subcutis 4, 

 thymus 4, adrenals 2, peri- 

 toneum 2, lung 3, proven- 

 triculus 2, intestine 4. 

 spleen 1, kidney 1, one 

 nerve 



Liver 3, peritoneum 4, one 

 nerve 



Liver 3, lungs 3, peritoneum 

 4, adrenal 2, proventricu- 

 lus 1, one nerve 



Average 



38 Four organs per case 



*K indicates that bird was killed for examination; D, that it died. 



Discussion 



Deposits of neoplastic lymphoid tissue in nerves of chickens are the subject 

 of controversy as to whether they represent foci of lymphocytoma or are a part 

 of the disease known as fowl paralysis. A consideration of this controversy 

 naturally leads to the question of whether or not a distinction should be drawn 

 between fowl paralysis and lymphocytoma. In other words, should each of these 

 conditions be considered as a separate entity? During the last fifteen years this 

 subject has been argued pro and con. The results of attempts at experiniental 

 transmission of the conditions have not led to a conclusive answer. The results 

 and conclusions as set forth in the excellent monograph on fowl paralysis by 

 Pappenheimer, Dunn, and Cone (24) pilblished in 1926 are most modern and are 



