Descubre y comparte nuestro conocimiento público

Se han encontrado 390 recursos

Resultados de búsqueda

Zak, T.Deshev, R.Benet-Perlberg, A.Naor, A.Magen, I.Shapira, Y.Ponzoni, R.W.Hulata, G.[Genetic improvement of Israeli blue (Jordan) tilapia, Oreochromis aureus (Steindachner), through selective breeding for harvest weight]Genetic improvement of Israeli blue (Jordan) tilapia, Oreochromis aureus (Steindachner), through selective breeding for harvest weight

Carcass characters for 365 male castrated cattle of the Africander, Angoni, Barotse and Boran breeds, and the reciprocal crossbreds of the latter three were reported. In each of the two year-of-birth groups, different slaughter-age/management regimes were used. For all carcass characters except t...


Thorpe, W.R.Cruickshank, D.K.R.Thompson, R.[Genetic and environmental influences on beef cattle production in Zambia. 3. Carcass characteristics of purebred and reciprocally crossbred castrated males]Genetic and environmental influences on beef cattle production in Zambia. 3. Carcass characteristics of purebred and reciprocally crossbred castrated males

Live weights from birth to 3.5 years are reported for beef cattle reared under ranching conditions in Zambia. The 809 cattle were purebred Africanders, Angonis, Barotses and Improved Borans and the reciprocal crossbreds of the latter three breeds born in 2 years. All animals born in the 1st year ...


Thorpe, W.R.Cruickshank, D.K.R.Thompson, R.[Genetic and environmental influences on beef cattle production in Zambia. 2. Live weights for age of purebred and reciprocally crossbred progeny]Genetic and environmental influences on beef cattle production in Zambia. 2. Live weights for age of purebred and reciprocally crossbred progeny

Dam reproductive performance of purebred Africander, Angoni, Barotse and Boran, and reciprocal crossbreds of the latter 3 breeds under ranching conditions were investigated. Mean performance based on a maximum of 1996 records collected over six parities were: calving rate, 65.6%; weaning weight r...


Thorpe, W.R.Cruickshank, D.K.R.Thompson, R.[Genetic and environmental influences on beef cattle production in Zambia. 4. Weaner production from purebred and reciprocally crossbred dams]Genetic and environmental influences on beef cattle production in Zambia. 4. Weaner production from purebred and reciprocally crossbred dams

Trypanosomosis, or sleeping sickness, is one of the most important livestock diseases in Africa. Some West African cattle breeds show a degree of resistance to a trypanosome infection: they are trypanotolerant. At the International Livestock Research Institute (ILRI) in Nairobi, Kenya, an F2 expe...


Waaj, E.H.V. de[Breeding for trypanotolerance in african Cattle.]Breeding for trypanotolerance in african Cattle.

The livestock sector plays crucial multifunctional roles in the rural livelihoods and economies of many sub-Saharan African countries; yet productivity remains relatively low in the region. Breed improvement programs that utilize advanced animal breeding technologies provide key entry points for ...


Ouma, Emily A.[Economic valuation of phenotypic cattle trait preferences in trypanosomosis prevalent production systems of Eastern Africa: Implications for sustainable cattle breeding programs.]Economic valuation of phenotypic cattle trait preferences in trypanosomosis prevalent production systems of Eastern Africa: Implications for sustainable cattle breeding programs.

Three dam breeds, the indigenous Ankole and zebu, and the Boran from Kenya were mated to Boran Angus and Red Poll sires to investigate the relationship between dam body weight and progeny performance. Under artificial insemination, at least 10% fewer cows were detected on heat than under natural ...


Trail, J.C.M.Sacker, G.D.Fisher, I.L.[Crossbreeding beef cattle in western Uganda. 1. Performance of Ankole, Boran and zebu cows]Crossbreeding beef cattle in western Uganda. 1. Performance of Ankole, Boran and zebu cows

Dorset Horn rams were used on East African Blackhead sheep in western Uganda in mutton production through improved lamb growth. The crossbred lambs were significantly heavier than the indigenous at birth. From birth to weaning at five months, the growth rates of both types were identical, being 0...


Trail, J.C.M.Sacker, G.D.[Production records of lambs from East African Blackhead ewes and Dorset Horn rams]Production records of lambs from East African Blackhead ewes and Dorset Horn rams
Gebrehiwot, N.Z.Strucken, E.M.Aliloo, H.Marshall, KarenGibson, John P.[Genetic structure and differentiation among African Bos Taurus cattle breeds]Genetic structure and differentiation among African Bos Taurus cattle breeds

Selecciona los documentos para visualizarlos

Nombre del archivo Ver recurso