Summary Isolations of M. hyorhinis from the lungs and nasal mucosa were compared with the histopathologic lesions established in these organs in lung and nasal mucosal samples from 525 piglets of different ages. M. hyorhinis was isolated considerably more often from pneumonic than from negative lungs, and the same applied to rhinitic and negative nasal mucosal samples. The differences in the frequency of M. hyorhinis in positive and negative cases were statistically significant. The results for the lungs distributed according to the age of the pigs showed that M. hyorhinis was considerably more infrequent in the pneumonic lungs of pigs aged under two weeks than in those of older animals in which no distinct difference could be demonstrated. The mycoplasma was not isolated at all from samples taken from pigs under one week of age. Zusammenfassung Über das Vorkommen von Mycoplasma hyorhinis in Respirationsorganen von Schweinen unter besonderer Berücksichtigung der enzootischen Pneumonie Lungen und Nasenschleimhaut von 525 Ferkeln wurden auf das Vorkommen von M. hyorhinis kulturell untersucht und die Ergebnisse mit den histopathologischen Befunden verglichen. M. hyorhinis wurde aus pneumonisch veränderten Lungen wesentlich häufiger isoliert als aus Lungen, die keine histopathologischen Veränderungen aufwiesen. Ebenso waren Isolierungen des Agens aus Nasenschleimhaut bei Vorliegen von Rhinitis‐Veränderungen zahlreicher als aus Schleimhaut von Tieren, bei denen keine solchen histopathologischen Veränderungen nachzuweisen waren. Der zahlenmäβige Unterschied war statistisch signifikant. Bei Ferkeln im Alter von weniger als 1 Woche konnte M. hyorhinis nicht isoliert werden. Bei Tieren, die 1–2 Wochen alt waren, wurde das Agens weniger oft isoliert als bei älteren Schweinen. Résumé Sur la présence de Mycoplasma hyorhinis dans les organes repiratoires de porcs, en considérant plus particulièrement la pneumonie enzootique On examine des cultures des poumons et des muqueuses nasales de 525 porcelets, quant à la présence de M. hyorhinis, et l'on compare les résultats avec les observations pathohistologiques. On isole beaucoup plus souvent M. hyorhinis dans des poumons à lésions pneumoniques que dans des poumons sans modifications pathohistologiques. De même, on isole plus souvent l'agent dans des muqueuses nasales présentant les modifications de la rhinite que dans des muqueuses d'animaux dépourvus de telles modifications. La différence numérique est statistiquement significative. Chez des porcelets âgés de moins d'une semaine, on n'a pas isolé de M. hyorhinis. Enfin, chez des animaux âgés de 1–2 semaines, on a isolé l'agent moins souvent que chez des porcs plus âgés. Resumen Sobre la presencia de Mycoplasma hyorhinis en los órganos respiratorios de cerdos bajo la consideración especial de la neumonía enzoótica Se examinaron en cultivos los pulmones y la mucosa nasal de 525 lechones en cuanto a la presencia de M. hyorhinis, comparándose los resultados con los hallazgos histopatológicos. M. hyorhinis se aisló con bastante mayo...

The effect of amprolium and of payzone on the functional state of the thyroid in growing chickens. Acta vet. scand. 1973, 14, 225-228. -Amprolium fed to growing chickens in a concentration of 125 p.p.m, in a commercial diet was accompanied by a small but significant decrease in th yroid activity compared with the results for untreated chickens, judged by serum PBI values. The epithelium: colloid relation was lowered. This was presumed to be a con sequence of the antagonistic effect of amprolium on thiamine. Pa yzon e feeding, 10 p.p .m. in commercial feed, caused a more pronounced retardation of th yroid activity, judged by the same criteria. A possible connection between the depressed th yroid function and the well-established improvement in weight gain and feed conversion in connection with payzone feeding is discussed.

Tissue selenium in pigs with dietetic microangiopathy (MAP, "mulberry heart"). Acta vet. scand. 1972, 13, 238-241. -Mean selenium contents of liver, heart muscle and skeletal muscle of pigs with dietetic microangiopathy (MAP), but without waxy muscle degeneration (MD) and hepatosis diaetetica (HD), were 1113, 85() and 265 ng/g d.s., respectively. These values were not lower than corresponding values of control pigs without MAP, MU and HD. MAP; microangiopathy; mulberry heart; pig; selenium.* Supported by grants from Statens RM fOr Skogsoch-Jordbruksforskning.

ANDERSSON, P. and ANNA-STINA GARRY-ANDERSSON : On the effect of payzone-feeding on some blood constituents of growing chickens. Acta vet. scand. 1973, 14, 229-232. -Payzone-feeding has been found to cause a decrease in thyroid activity. In this study the blood of payzone-fed birds was investigated to find if this decrease would be strong enough to cause any changes in the content of GPT, GOT, alkaline phosphate, glucose, cholesterol, BUN, UA, total protein or globulin. No significant changes were found . A slight increase in GOT and UA was observed. pay z 0 n e; chi c ken; b I 0 0 d.