摘要:

An attempt has been made to determine whether abnormalities in the composition of the milk from streptococcus-free quarters are due to bacterial infection.Four normal young animals whose previous history was known in considerable detail were selected for study. Series of samples from consecutive milkings were examined at intervals over a period of several months. Unfortunately none of the quarters studied showed more than a transitory rise in the level of catalase values during these detailed studies, so that the findings reported do not settle the question. Regular rhythmic fluctuations in counts from the foremilk were again noted, extremely high counts for the morning milkings alternating with low counts for the afternoon milkings.The relation between bacterial numbers and abnormal composition of the foremilk is not a simple one. High biochemical values may accompany low count levels while extremely high counts may exert no apparent influence upon the composition of the milk at that time. Possibly a second agent in addition to bacteria is concerned.More intensive studies of a single animal yielding milk with very high counts revealed higher biochemical values for strippings than for foremilk, those for catalase being surprisingly high. Despite the unusual nature of these findings, none of the four quarters became definitely abnormal during the fourteen weeks during which this animal was under observation, but subsequent routine samplings have shown that all four quarters must now be regarded as abnormal.No one type of organism appears to be associated with changes in the composition of the secretion.

ISSN:1923-4287    

DOI:10.1139/cjr38d-003

出版商:NRC Research Press    

年代:1938

数据来源: NRC

摘要:

A differential lipid analysis was performed by oxidative micromethods on heparinized plasma and red blood cells of 89 normal healthy rabbits and the normal means and range of blood lipid values established. Within this normal range, the amounts of all lipids in plasma were found to increase at the same relative rate, but a similar relation was found only for phospholipid and cholesterol in the red blood cells. Sex, body weight, blood hemoglobin and season were found to be without effect on the average lipid content of the blood of normal rabbits.

ISSN:1923-4287    

DOI:10.1139/cjr38d-004

出版商:NRC Research Press    

年代:1938

数据来源: NRC