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Five lactation curve models were compared for their fitness to milk data of indigenous and crossbred cows using data from Bako Agricultural Research Center and Debre Zeit Research Station. The fit of the models was compared using the model Rz value. The overall mean RZ value was 81.5 t 0.12% and ...


Gebreyohannes, G.Tegegne, AzageDiedhiou, M.L.Hegde, B.P.[Modeling lactation curve and comparison of models fitness to different lactation data of indigenous and crossbred cows]Modeling lactation curve and comparison of models fitness to different lactation data of indigenous and crossbred cows
Autor: Jabbar, M.A.

In sub-Saharan Africa, animal traction is well developed in the Ethiopian highlands and common in the highlands of Kenya and Madagascar, but it is abscent in other highland areas. The technique is also well develop in areas of the semi-arid tropics and is emerging in some parts of the subhumid zo...


Jabbar, M.A.[Research on cow traction in Africa: Some lessons to be learned]Research on cow traction in Africa: Some lessons to be learned

Peripheral blood leukocytes of 11 normal cows, 7 cows heterozygous and 2 heifers homozygous for bovine leukocyte adhesion deficiency (BLAD) were analysed by flow cytometry for the intensity of their B2 integrin expression (LFA-1 (CD11a/CD18), CR3 (CD11b/CD18) and CR4 (CD11c/CD18)). BLAD-homozygot...


Cox, E.Mast, J.MacHugh, Niall D.Schwenger, B.Goddeeris, B.M.[Expression of beta 2 integrins on blood leukocytes of cows with or without bovine leukocyte adhesion deficiency]Expression of beta 2 integrins on blood leukocytes of cows with or without bovine leukocyte adhesion deficiency

The 2002 World Summit on Sustainable Development focussed attention on agricultural sustainability and biodiversity in developing countries. These goals are relevant for livestock production in Kenya, where development agencies encourage resource-poor smallholders to acquire large, exotic, high-y...


King, J.M.Parsons, D.J.Turnpenny, J.R.Nyangaga, J.Bakari, P.Wathes, C.M.[Modelling energy metabolism of friesians in Kenya smallholdings shows how heat stress and energy deficit constrain milk yield and cow replacement rate]Modelling energy metabolism of friesians in Kenya smallholdings shows how heat stress and energy deficit constrain milk yield and cow replacement rate

Cardio-respiratory and mechanical work output variables were measured for four F1 crossbred dairy cows (average weight 475 kg) over a range of work levels. Resting (standing prior to exercise) heart rates (average 62 beats per min) and respiratory rates (average 21 breaths per min) were similar t...


Zerbini, E.Gemeda, T.O'Neill, D.H.Howell, P.J.Schroter, R.C.[Relationships between cardio-respiratory parameters and draught work output in F1 crossbred dairy cows under field conditions]Relationships between cardio-respiratory parameters and draught work output in F1 crossbred dairy cows under field conditions

Assesses reproductive performance, body weight & live weight, pre-weaning growth, and viability of progeny sired by various unrelated breeds which are representative of the Sanga X Sanga, Sanga X Zebu, Bos taurus X Sanga, Bos taurus X Zebu, and Bos taurus X Bos taurus crossbred groups. Measures t...


Tawonezvi, H.P.R.Ward, H.K.Trail, J.C.M.Light, D.E.[Evaluation of beef breeds for rangeland weaner production in Zimbabwe. 2. Productivity of crossbred cows and heterosis estimates]Evaluation of beef breeds for rangeland weaner production in Zimbabwe. 2. Productivity of crossbred cows and heterosis estimates
Tawonezvi, H.P.R.Ward, H.K.Trail, J.C.M.Light, D.E.[Evaluation of beef breeds for rangeland weaner production in Zimbabwe. 1. Productivity of purebred cows]Evaluation of beef breeds for rangeland weaner production in Zimbabwe. 1. Productivity of purebred cows

A study undertaken to characterise the oestrous cycle in Zebu cows following oestrous induction with PGF (Prostaglandin F2alpha) and examines the function of the subsequently formed CL (corpus luteum) by monitoring levels of peripheral plasma progesterone.


Mukasa-Mugerwa, E.Tegegne, AzageMattoni, M.Cecchini, G.[Effect of oestrous synchronization with prostaglandin F2alpha in Ethiopian highland Zebu (Bos indicus) cows]Effect of oestrous synchronization with prostaglandin F2alpha in Ethiopian highland Zebu (Bos indicus) cows

Forty F1 crossbred dairy cows (20 Friesian X Boran and 20 Simmental X Boran) in a 2x2 factorial arrangement (not working-not supplemented, NWNS, not working-supplemented, NWS, working-not supplemented, WNS and working-supplemented, WS) were used to study the effect of work and diet supplementatio...


Zerbini, E.Gemeda, T.Gebre-Wold, A.Nokoe, S.Demissie, D.[Effect of draught work on performance and metabolism of crossbred cows. 2. Effect of work on roughage intake, digestion, digesta kinetics and plasma metabolites]Effect of draught work on performance and metabolism of crossbred cows. 2. Effect of work on roughage intake, digestion, digesta kinetics and plasma metabolites

Groups of lactating N'Dama cows maintained under traditional husbandry conditions were given dry season supplements of locally available oil seed residues to establish nutritional recommendations for improving livestock productivity in the sub-humid zone of West Africa. In one experiment cows wer...


Little, D.A.Wassink, G.J.Agyemang, K.Leperre, P.Janneh, L.Badjie, B.[Feed supplementation of lactating N'Dama cows under village husbandry]Feed supplementation of lactating N'Dama cows under village husbandry

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