摘要:

Extract

ISSN:0048-0169    

DOI:10.1080/00480169.1979.34616

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

The prevalence of subclinicalSalmonellainfection in sheep at slaughter was monitored at two slaughter-houses in the southern part of the North Island over a 17-month period during 1975 and 1976. The crude prevalence rate was 4.7% (96/2027). Prevalence rates were greatest in the 2 and 4-tooth age group, with maximum monthly rates of 30%and 32% during 1975 and 1976 respectively. The seasonal distribution of infections was similar in each age group, prevalence rates being greatest in March, April and May, and least in October, November and December.

ISSN:0048-0169    

DOI:10.1080/00480169.1979.34617

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Extract

ISSN:0048-0169    

DOI:10.1080/00480169.1979.34619

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Thehardjocomponent of a bivalenthardjo/pomonavaccine prepared from cultures grown in a protein-free medium was tested in calves which experienced a natural challenge about 7 months after vaccination. A significant degree of protection was obtained using either seroconversion or positive urine cultures as in-dicators of infection. Seroconversion occurred in 10/10 non-vaccinates and 2/9 vaccinates (p <0.01), Leptospires of serovarhardjowere isolated from the urine of 6/10 non-vaccinated calves and 0/9 vaccinated animals (p <0.05).

ISSN:0048-0169    

DOI:10.1080/00480169.1979.34620

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

ISSN:0048-0169    

DOI:10.1080/00480169.1979.34621

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Pig kidneys naturally infected withLeptospira interrogansserovapomonawere subjected to chilling (0 ° C) and freezing storage (−15 ° C). Seven out of 9 (78%) kidneys still contained viable leptospires after 14 days at 0 ° C and 8 out of 10 (80%) after 30 days at −15 ° C. Both experimental chilling and freezing occurred at an average rate of l ° C/h. It is concluded that the commercial processes of chilling and freezing do not eliminate leptospires from infected pig kidneys.

ISSN:0048-0169    

DOI:10.1080/00480169.1979.34622

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

A trial was conducted to assess the efficacy of a single intra-muscular injection of 25mg per kg of streptomycin in stopping leptospiruria in growing pigs exposed to a natural infection.

ISSN:0048-0169    

DOI:10.1080/00480169.1979.34623

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Inherited goitre in a flock of sheep possessing a proportion of Polled Dorset blood is reported and discussed. The cases en-countered were not induced by a simple deficiency of iodine, or the presence of goitrogenic substances in their feed. Further work is recommended on the nature of the defect and its method of inheritance.

ISSN:0048-0169    

DOI:10.1080/00480169.1979.34624

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor