| the bionomics of the free-living larvae and the transmission of dictyocaulus filaria between lambs in north-east england. | the bionomics of the free-living larvae of dictyocaulus filaria on pasture, and the transmission of infection between lambs, were studied during different seasons of the year in north-east england. the rate of development of first-stage larvae to the third stage took 4-9 days in late spring and summer, 1 1/2-4 weeks in autumn and 5 1/2-7 weeks in winter. the proportion of first-stage larvae developing to the third stage ranged from 10-28% in autumn and winter, and 2-25% in spring and summer. the ... | 1976 | 135016 |
| the epidemiology of dictyocaulus filaria in north east england. | the seasonal pattern of dictyocaulus filaria infection in four flocks of sheep under field conditions was studied by faecal examination for larvae. the prevalence of infection in lambs was low in spring and summer but increased in late autumn or winter, then fell again to a low level by may. however, most lambs became infected at some time during their first year of life. in ewes the prevalence of infection was generally low, but rose during winter and spring. seasonal pattern and intensity of i ... | 1977 | 140454 |