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J L van Os

Publications and source records attributed to J L van Os.

11 recordsLinked to original sources
PubMed1981

Oestrus control and the incidence of mammary nodules in bitches, a clinical study with two progestogens.

The incidence, size and location of mammary nodules were established in 10 practices in The Netherlands by the clinical examination of bitches in which oestrus was controlled with proligestone (P), 331 animals, or medroxyprogesterone acetate (MAP), 341 animals and in 339 animals never medicated with such compounds. In comparison with the unmedicated control and the P-medicated animals of comparable age the incidence of mammary nodules of all sizes was significantly increased in the MAP-medicated animals. There was no significant difference in nodule incidence between the P-medicated animals and the control animals. Based on the assumption that nodules above a certain size are most likely tumours, these results indicate that oestrus control with MAP stimulates tumour development even in animals medicated for less than four years. The practical value of the reported differences, especially in relation to the subsequent requirement for surgical removal of tumours in bitches, medicated for oestrus control, is discussed.

Animals↗
PubMed1980

[Veterinarians and computers (author's transl)].

Because of the fact that the use of computers depends both on the user and on the apparatus, some characteristics of veterinarians and computers are discussed. Although veterinarians probably are not pre-eminently computer-minded in view of their choice of profession and training, they will be increasingly confronted with disciplines tending to employ data-processing systems as an item of training and field of interest. The extent to which computers can be used, will depend on their accessibility, reliability in operation, accuracy, flexibility and cost price. A discussion of these features shows that the fear of computers usually is greater than that warranted by the technology currently available. Their use commences at the point at which large numbers of data have to be processed and automation offers advantages from the point of view of economy or organization (systems of administration and payment). Moreover, data which has already been available for a certain period, is rendered accessible for the first time by automatic processing (meat inspection). Finally, a demand will be created by the supply of data. A number of uses in the various veterinary disciplines are discussed. Part of a computer teaching programme of a faculty of veterinary medicine is described as a practical instance.

Computer-Assisted Instruction↗
PubMed1979

[Injections].

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Animal Diseases↗
PubMed1978

[Veterinarians and computers (author's transl)].

Uses of the computer in veterinary medicine are reviewed. The fact that the constantly increasing volume of the literature continues to be accessible is mainly due to the use of computers. In scientific research, the results of measurements and studies are being increasingly recorded and processed automatically. Diagnosis and epidemiology are promoted by more adequate processing and analysis of centrally collected data, as are herd management and disease control programmes in farm animals. In veterinary education, the computer is used as an aid in instruction. Administrations of practices are eminently suited for automation. Future developments in these fields are also discussed.

Animal Husbandry↗
PubMed1977

[The use of a dry cow preparation for the prevention of summer mastitis in maiden heifers (author's transl)].

An investigation was made of the preventive value of topical application to juvenile udders of a dry cow preparation containing 300,000 IU of procaine penicillin G (Penzal N 300). Penicillin concentrations in udder secretions of 30 young cows were examined. In calves up to 10 weeks and in maiden heifers up to 7 weeks after application an average concentration of 0.05 ml IU per ml of secretion was found. In the same groups, 12 and 9 weeks respectively after application, the concentration was 0.01 IU per ml of secretion. Experiences in practice in an area with a high infection rate have shown an obvious protection in 700 maiden heifers. Some cases of infection did occur both shortly (1.0%) and from 5 weeks after application (1.9%). The clinical character of the latter was much milder than is usual for summer mastitis. When administered in time and in the correct manner the dry cow preparation examined showed reasonable protection against summer mastitis.

Administration, Topical↗