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Abstract

The performance of Nguni, Bonsmara and Hereford cattle which were maintained free of ticks by short-interval treatment with acaricide irrespective of tick load (tactical) was compared with similar groups which were treated for tick infestation only when the numbers of adult ticks reached moderately ...

Author(s)
Fivaz, B. H.; Waal, D. T. de
Citation
Tropical Animal Health and Production, 1993, 25, 1, pp 19-28
Abstract

A comparison of the tick resistance of indigenous Mashona and crossbred Africander × Sussex oxen following natural tick infestation indicated that significantly more African blue ticks (Boophilus decoloratus) were found on the crossbred than the indigenous cattle. The two groups of cattle had been...

Author(s)
Fivaz, B. H.; Waal, D. T. de; Lander, K.
Citation
Tropical Animal Health and Production, 1992, 24, 2, pp 81-89
Abstract

The performance of alphamethrin [alpha-cypermethrin] and flumethrin treated and untreated Bonsmara cows and calves grazing in the thornveld of the Eastern Cape Province, South Africa, was compared over a 2-year period (1988-90). The economically important tick species (Rhipicephalus appendiculatus, ...

Author(s)
Fivaz, B. H.; Waal, D. T. de
Citation
Tropical Animal Health and Production, 1993, 25, 3, pp 131-143
Abstract

A comparison of the serological responses of tick-free and tick-infested cattle following inoculation with the Botswana SAT 2 foot-and-mouth disease vaccine indicated that infestation by the brown ear tick, Rhipicephalus appendiculatus, did not affect serological responses to the vaccine. This...

Author(s)
Fivaz, B. H.; Blackburn, N. K.
Citation
Research in Veterinary Science, 1990, 49, 1, pp 113
Abstract

Controlled repeated infestation of Bos taurus (Friesland×Hereford) and B. indicus (Brahman×Afrikander) cattle resulted in a decline in the recovery of all R. appendiculatus instars. Resistance to infestation varied between individuals although all individuals manifested severe hypersensitivity at...

Author(s)
Fivaz, B. H.; Norval, A.
Citation
Experimental & Applied Acarology, 1990, 8, 1,2, pp 51-63
Abstract

Three infestations of stantioned Jersey and Friesland bull calves with adult A. hebraeum did not affect the rate of engorgement of female ticks and resulted in an insignificant decline in the mean engorgement weight of female ticks recovered from the Friesland group. Repeated infestations...

Author(s)
Fivaz, B. H.; Nurton, J. P.; Petney, T. N.
Citation
Veterinary Parasitology, 1991, 38, 4, pp 299-315
Abstract

Repeated sensitization of Friesland × Hereford cattle resulted in reduced rates of recovery of the tick at each instar. Specific antibodies to tick salivary gland were formed, and there was an enhanced skin reaction at the site of attachment. Principal factors in the immune response were...

Author(s)
Fivaz, B. H.; Norval, R. A. I.; Brown, A.
Citation
Proceedings of the 13th World Congress on Diseases of Cattle, Durban, South Africa, 1984, 1, pp 455-460
Abstract

Current cattle tick control practices and producer attitudes towards tick control in the eastern Cape Province of South Africa are discussed. These were ascertained from answers to a questionnaire survey to which 31.2% of farmers responded. In general, producers favoured tick control. Beef and...

Author(s)
Spickett, A. M.; Fivaz, B. H.
Citation
Onderstepoort Journal of Veterinary Research, 1992, 59, 3, pp 203-210
Abstract

Of 7 cross-bred cattle, aged about 18 months and weighing approximately 450 kg, 4 were resistant to R. appendiculatus and 3 were tick naive. All were experimentally infested with adult R. appendiculatus (25 male and 25 female ticks/ear) infected with the Boleni strain of T. parva bovis, and...

Author(s)
Fivaz, B. H.; Norval, R. A. I.; Lawrence, J. A.
Citation
Tropical Animal Health and Production, 1989, 21, 2, pp 129-134

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