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Abstract

A comparison of the yield of engorged nymphs of R. appendiculatus and R. pulchellus was carried out between cattle (zebu or Friesian × zebu) highly resistant to R. appendiculatus but susceptible to R. pulchellus, and cattle and rabbits susceptible to both species. Resistant cattle yielded fewer and ...

Author(s)
Castro, J. J. de; Newson, R. M.; Herbert, I. V.
Citation
Experimental & Applied Acarology, 1989, 6, 3, pp 237-244
Abstract

Experiments were performed to see if resistance to infestation by R. appendiculatus could be induced in rabbits and cattle for experimental purposes by the feeding effects of adults sterilized with gamma radiation. Doses of 0.15-2.40 krad were tested and 1.20 and 2.40 krad were found to be...

Author(s)
Newson, R. M.; Castro, J. J. de
Publisher
E.J. Brill, Leiden, Netherlands
Citation
Progress in acarology. Volume 2., 1989, pp 387-391
Abstract

A drop-off rhythm of engorged R. appendiculatus was demonstrated for females and engorged nymphs, but not for larvae. 70% of 1279 engorged R. appendiculatus females dropped off Friesian calves between 08.00 and 10.00 h, while 66% of 2736 engorged nymphs dropped between 16.00 and 18.00 h. Females...

Author(s)
Mwangi, E. N.; Newson, R. M.; Kaaya, G. P.
Citation
Insect Science and its Application, 1991, 12, 5/6, pp 629-633
Abstract

The biology of Rhipicephalus appendiculatus Neum. in a coastal area of Kenya is described from observations on 6 East African Zebu cattle in 1973-76. The numbers of adult ticks on the ears of the cattle were low in the driest weather (December-March) and increased in April with the arrival of the...

Author(s)
Newson, R. M.
Publisher
Centre for Tropical Veterinary Medicine, University of Edinburgh., Edinburgh, UK
Citation
Tick-borne diseases and their vectors., 1978, pp 46-50
Abstract

Tick-susceptible Friesian steers and resistant East African Zebu were used as bait animals to assess the availability of adults of R. appendiculatus on pasture in Rusinga Island, Kenya. Assuming that initial gross pickup rates of ticks by cattle were similar, the numbers of female ticks that...

Author(s)
Latif, A. A.; Punyua, D. K.; Capstick, P. B.; Newson, R. M.
Citation
Journal of Medical Entomology, 1991, 28, 1, pp 127-132
Abstract

In investigations on East Coast fever (caused by Theileria parva and transmitted mainly by Rhipicephalus appendiculatus Neum.) in East and Central Africa, the life-history of this vector was investigated in 1975-76 on a herd of cattle belonging to the semi-nomadic Masai tribe in central Kenya,...

Author(s)
Newson, R. M.; Punyua, D. K.
Publisher
Centre for Tropical Veterinary Medicine, University of Edinburgh., Edinburgh, UK
Citation
Tick-borne diseases and their vectors., 1978, pp 51-55
Abstract

The effects of host resistance on the population dynamics of Rhipicephalus appendiculatus was studied in herds of Maasai cattle in Kenya. Female ticks collected at one site from cattle had a scutal length of 1.22 mm, whereas in engorged females of the F1 generation reared in the laboratory on...

Author(s)
Newson, R. M.; Chiera, J. W.
Citation
ACIAR Proceedings Series, Australian Centre for International Agricultural Research, 1987, No. 17, pp 60
Abstract

In Kenya, a comparison of feeding and breeding performance was made between a laboratory strain (LS) and 2 freshly collected field strains (FS1, FS2) of R. appendiculatus. The LS had been cultured for over 30 years on tick-susceptible rabbits. When fed on susceptible rabbits LS produced smaller...

Author(s)
Chiera, J. W.; Newson, R. M.; Karuhize, G. R.
Citation
Parasitology, 1989, 99, 1, pp 149-155
Abstract

East Coast fever (ECF) (caused by Theileria parva) is an important parasitic disease of cattle in East and Central Africa. Past experimental studies have provided a great deal of information on the dynamics of the life cycle of the vector R. appendiculatus. This paper describes a mathematical model ...

Author(s)
King, D.; Gettinby, G.; Newson, R. M.
Citation
Veterinary Parasitology, 1988, 29, 1, pp 41-51
Abstract

Network representation and computer modelling techniques were used to develop a framework in which to investigate the relationship between tick resistance to acaricides and genetic fitness. The computer model simulated the day-to-day occurrences experienced by ticks and allowed constants relating...

Author(s)
Gettinby, G.; Newson, R. M.; Calpin, M. M. J.; Paton, G.
Citation
Preventive Veterinary Medicine, 1988, 6, 3, pp 183-197

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