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Blood samples were collected from parasitaemic cattle in the Ghibe Valley, Ethiopia, frozen in liquid nitrogen and transported to Nairobi, Kenya. Twelve of the stabilates were inoculated into individual Boran (Bos indicus) calves and characterised for their sensitivity, in turn, to diminazene ace...


Codjia, V.Mulatu, W.Majiwa, P.A.O.Leak, S.G.A.Rowlands, G.J.Authié, E.D'Ieteren, G.D.M.Peregrine, A.S.[Epidemiology of bovine trypanosomiasis in the Ghibe valley, southwest Ethiopia. 3. Occurrence of population of Trypanosoma congolense resistant to diminazene, isometamidium and homidium]Epidemiology of bovine trypanosomiasis in the Ghibe valley, southwest Ethiopia. 3. Occurrence of population of Trypanosoma congolense resistant to diminazene, isometamidium and homidium

An average of 840 East African Zebu cattle from nine herds in the Ghibe Valley, southwest Ethiopia were monitored from 1986 to 1990. Each month blood samples were collected from analysis of packed red cell volume and detection of trypanosomes. Animals were found to be parasitaemic and with a PCV ...


Rowlands, G.J.Mulatu, W.Authie, A.D'Ieteren, G.D.M.Leak, S.G.A.Nagda, S.M.Peregrine, A.S.[Epidemiology of bovine trypanosomiasis in the Ghibe Valley, southwest Ethiopia. 2. Factors associated with variations in trypanosome prevalence, incidence of new infections and prevalence of recurrent infections]Epidemiology of bovine trypanosomiasis in the Ghibe Valley, southwest Ethiopia. 2. Factors associated with variations in trypanosome prevalence, incidence of new infections and prevalence of recurrent infections

Approximately 320 East African Zebu cows over 36 months of age were monitored monthly from 1986 to 1992 in nine village herds in an area of high trypanosomiasis risk in southwest Ethiopia where there was resistance to all available trypanocidal drugs. Cows were individually treated with diminazen...


Rowlands, G.J.Woudyalew MulatuNagda, S.M.D'Ieteren, G.D.M.[Variations in packed red cell volume and trypanosome prevalence and relationships with reproductive traits in East African Zebu cows exposed to drug-resistant trypanosomes]Variations in packed red cell volume and trypanosome prevalence and relationships with reproductive traits in East African Zebu cows exposed to drug-resistant trypanosomes

Multilevel data structures can occur in many areas of agricultural research for instance on-farm trials, where there can be information at the village, farm and plot or animal level. Analysis of variance except in balanced or nested designs - has been difficult to apply to data with a multilevel ...


Allan, E.Rowlands, G.J.[Mixed models and multilevel data structures in agriculture]Mixed models and multilevel data structures in agriculture

The pick-up rates of tick species by various resistant groups of animals, dipped once a month and not dipped were investigated under ranch conditions in Nabiswera, Luwero district, Uganda. During the first three weeks of exposure of cattle to natural tick infestation, two phases of tick build-up ...


Okello-Onen, J.Tukahirwa, E.M.Pery, B.D.Rowlands, G.J.Nagda, S.M.Musisi, G.Bode, E.Heinonen, R.Mwayi, W.Opuda-Asibo, J.[The effects of host resistance on the pick-up rates of ticks under natural infestation in Uganda]The effects of host resistance on the pick-up rates of ticks under natural infestation in Uganda

We considered the analysis of a study for Dorper, Red Maasai and crossbred lambs born over a period of 6 years at the Diani Estate, Kenya. The study was designed to compare survival and performance traits of genotypes with differing susceptibilities to helminthiasis. The available data include in...


Nguti, R.Burzykowski, T.Rowlands, G.J.Renard, D.Janssen, P.[Joint modelling of repeated measurements and event time: Application to performance traits and survival of lambs bred in sub-humid tropics]Joint modelling of repeated measurements and event time: Application to performance traits and survival of lambs bred in sub-humid tropics

Studies on seasonality and population dynamics of ticks on indigenous cattle and their crosses (calves) were carried out in Buruli Ranching Scheme, Nabiswera, Luwero District of Uganda on three treatment groups of animals: group 1 (twice a week dipping), group 2 (once a month dipping) and group 3...


Okello-Onen, J.Tukahirwa, E.M.Perry, Brian D.Rowlands, G.J.Nagda, S.M.Musisi, G.Bode, E.Heironen, R.Mwaji, W.Opuda-Asibo, J.[Population dynamics of ticks on indigenous cattle in a pastoral dry to semi-arid rangeland zone of Uganda]Population dynamics of ticks on indigenous cattle in a pastoral dry to semi-arid rangeland zone of Uganda

John Rowlands, former Head of Biometrics at the International Livestock Research Institute introduces the second version of the 'biometrics' teaching resource. This version was 'launched' at ILRI Addis Ababa on 10 November 2011 as part of the 'Livestock Exchange' event. Supported by the Rockefell...


Rowlands, G.J.[ILRI's biometrics and research methods teaching resource launched in Addis Ababa]ILRI's biometrics and research methods teaching resource launched in Addis Ababa

Approximately 390 East African Zebu calves from birth to 3 years of age and their dams were monitored monthly from 1986 to 1992 in nine village herds in an area of high trypanosomiasis risk in southwest Ethiopia where there was resistance to all available trypanocidal drugs. Cattle were individua...


Rowlands, G.J.Mulatu, W.Authié, E.D'Ieteren, G.D.M.Leak, S.G.A.Nagda, S.M.[Effects of trypanosomiasis on growth and mortality of young East African Zebu cattle exposed to drug-resistant trypanosomes]Effects of trypanosomiasis on growth and mortality of young East African Zebu cattle exposed to drug-resistant trypanosomes

The survival rates of Dorper, Red Maasai and crossbred lambs born over a period of 6 years at Diani Estate, Coast Province, Kenya were compared using the Cox mixed proportional hazards model with a random (frailty) term for sire. Of the 1785 lambs born, proportionately 0.44 died before they were ...


Nguti, R.Janssen, P.Rowlands, G.J.Audho, James O.Baker, R.L.[Survival of Red Maasai, Dorper and crossbred lambs in the sub-humid tropics]Survival of Red Maasai, Dorper and crossbred lambs in the sub-humid tropics

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