Crossbreeding beef cattle in Western Uganda 5. Growth and carcass evaluation of castrated males

Trail, J.C.M.; Sacker, G. D.; Marples, H. J. S.

doi:10.1017/s0003356100029548

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…Fat levels of the steers in the Ugandan study were also insufficient for prevailing commercial requirements and later slaughter ages were recommended (Trail et al, 1971). The absence of any genotype x 'management' interaction suggests that the conclusion is applicable to all genotypes considered here.…”

Section: Discussionmentioning

confidence: 79%

“…The lack of heterosis in the Angoni/Boran crossbreds was not surprising in view of the similarity of the parent breed types (Mason and Maule, 1960). Trail, Sacker and Marples (1971) found little important heterosis for carcass traits in crosses of Angus, Boran and Red Poll sire breeds, and Ankole, Boran and zebu dam breeds in Uganda, and breed of sire by breed of dam interactions were only significant for cold dressed weight and leg and chest measurements. Nevertheless, the improvement shown by the crossbreds as compared to the poorer parent would give substantial increases in carcass production.…”

Section: Discussionmentioning

confidence: 82%

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Genetic and environmental influences on beef cattle production in Zambia 3. Carcass characteristics of purebred and reciprocally crossbred castrated males

Thorpe¹,

Cruickshank²,

Thompson

1980

Anim. Sci.

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Carcass characters for 365 male castrate cattle of the Africander, Angoni, Barotse and Boran breeds, and the reciprocal crossbreds of the latter three breeds, are reported. In each of the two year-of-birth groups, different slaughter-age/management regimes were used. For all carcass characters, except those related to size, the two sanga breeds, Africander and Barotse, were very similar, as were the two zebu breeds, Angoni and Boran. The introduced breeds, Africander and Boran, which had similar carcass weights, had heavier carcasses (+18 kg, +10%) than the indigenous Barotse and Angoni breeds.The sanga breed carcasses had less fat cover than those of the zebu breeds. Maternal effects were not important for carcass characters and the Angoni/Barotse and Angoni/Boran crosses showed no heterosis. In the Barotse/Boran crosses, slaughter and carcass weights and eyemuscle area gave between 8% and 9·5% heterosis, and the linear carcass measurements between 2% and 3%.It was concluded from the management comparisons that there was no economic advantage in delaying slaughter to the later of the two ages compared in the two year-of-birth groups.

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Section: Discussionmentioning

confidence: 79%

Section: Discussionmentioning

confidence: 82%

Genetic and environmental influences on beef cattle production in Zambia 3. Carcass characteristics of purebred and reciprocally crossbred castrated males

Thorpe¹,

Cruickshank²,

Thompson

1980

Anim. Sci.

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The growth and carcass characteristics of crosses of Hereford and Friesian with Angoni, Barotse and Boran cattle in Zambia

Thorpe¹,

Cruickshank²,

Thompson

1979

J. Agric. Sci.

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Seven hundred and fifty purebred Angoni, Barotse and Boran cattle and their crosses sired by Friesian and Hereford bulls were compared for live-weight and carcass characters in Zambia. The cattle were born between September and December in three consecutive years and were reared on unimproved veld. In the first year all females and a random half of the males received supplementary feed in winter and the males were slaughtered at 2-5 years of age. The remaining males received the same total amount of winter supplementary feed prior to slaughter at 3-0 years of age. The males born in the second year were pen fed for a period prior to slaughter at 3-0 years of age. Males born in the third year were slaughtered at 3-5 years of age and received no supplementary feed.Genotype differences were important at all live weights and there were year of birth x genotype interactions at the 0-5, 1-0 and 1-5 year weights and a genotype x feed treatment interaction at the 2'0 year weight. Boran purebreds were heavier than the Angoni and Barotse purebreds; at 3-0 years the differences were +42-3 kg ( + 12-9%) and + 25-2 kg (+ 7-7 %) respectively. Cross-breds had heavier live weights than their corresponding purebreds with Boran crosses consistently heavier than the Angoni and Barotse crosses. The Friesian and Hereford sired Boran cross-breds were + 51-0 kg (+13-5 %) and + 43-0 kg (+ 11-6 %) heavier respectively than the purebred Borans at 3-0 years of age.There were large differences between the genotypes for all carcass characters with Borans having heavier carcasses than the Angonis and Barotses by + 20-3 kg (+10-6 %) and +19-1 kg ( + 10-0%) respectively. The average carcass weight advantages of Friesian and Hereford crosses with the Angoni, Barotse and Boran breeds over the corresponding purebreds were +40-3 kg ( +19-0%), +33-6 kg ( + 16-2%) and +31-0 kg ( + 14-0%) respectively. There were few important carcass differences between the corresponding Friesian and Hereford crosses.The mortality rate during the experiment was 8-2% with only small differences between genotypes.The interactions found in the experiment indicated that breed comparisons should be conducted over a number of years and at various management levels. For growth and carcass production under the conditions of the experiment the use of exotic crossbreds is clearly advantageous. reliable estimates of breed performance and compansons among breeds which would provide the Genetic improvement can be expected to play a basis for genetic improvement are seldom available, part in increasing the efficiency of cattle production In Zambia for example, published estimates are even in the absence of concurrent improvements limited to a study of the indigenous Angoni in management. Although these conditions often (Walker, 1964) and a comparison of the Angoni prevail in the developing countries of Africa, with exotic breeds for some reproductive charac-

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The Indigenous Domestic Animal Genetic Resources of Uganda

Mbuza¹

1995

Anim. Genet. Resour. Inf.

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SUMMARYThe author discusses the overall availability and economic role of indigenous livestock resources in Uganda. After a distinct reduction in number during the 80's, there is now an upsurge in the cattle number (4 300 000 in 199 1). The better milk yielding Ankole (Songa cattle) represents nearly half of those cattle, while just over 32% are of the zebu short-horn type (mainly the stocky Nkedi and the large framed Karamojong). The remaining 18% are of the non-distinct Nganda type that probably originated the crossbreeding of the Ankole and zebu shorthorns. While there are no exact data concemin crossbreeding with exotic breeds, it is estimated that there are some 30 000 exotic beef and dairy cattle and around 100 000 crossbreeds. The total goat population remained reasonably stable in recent years (3 700 000 of which 2 000 000 are breeding females). The majority (I 500 000) belong to the distinct smallbodied East Afiican goat type (25–30 kg liveweight), the two other distinct populations being those originating in the Mubende (4 230 000) and the Kigezi (930 000) regions. Both are predominantly black coloured, the Mubende being characterized by a short and fine coathair, the Kigezi being longhaired. All sheep breeds are fat-tailed. The Masai (216 000) is found in the Eastern and Northern part of the country, the Black-head (490 000) in the East and the so-called East Mrican long-tail (257 000) all over the country. The author indicates that there is an indigenous pig type (670 000) and some 1 200 000“village”chickens.

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Crossbreeding beef cattle in Western Uganda 5. Growth and carcass evaluation of castrated males

Cited by 4 publications

References 7 publications

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

The growth and carcass characteristics of crosses of Hereford and Friesian with Angoni, Barotse and Boran cattle in Zambia

The Indigenous Domestic Animal Genetic Resources of Uganda

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