Studies on the production of beef from zebu cattle in East Africa I. A description of the Muguga herd

1960 ◽  
Vol 55 (2) ◽  
pp. 229-231 ◽  
Author(s):  
G. H. Lampkin ◽  
K. Lampkin
Keyword(s):  
East Africa ◽  
Animal Breeding ◽  
Research Organization ◽  
Zebu Cattle ◽  
East African ◽  
Forestry Research ◽  
Veterinary Research ◽  
Research Organisation ◽  
Breeding Research ◽  
African Agriculture

1. The formation of a herd of Northern Frontier Zebus for genetical research has been described.2. Details are given of the system of mating used and the type of management adopted.Thanks are due to Dr J. W. B. King of the Animal Breeding Research Organization, Edinburgh, for his advice, to Mr M. A. Witcomb for taking the photographs, and to the Directors of the East African Veterinary Research Organization and the East African Agriculture and Forestry Research Organisation for their encouragement.

Rhipicephalus carnivoralis sp.nov. (Ixodoidea, Ixodidae) A new species of tick from East Africa

Parasitology ◽  
1966 ◽  
Vol 56 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Jane B. Walker
Keyword(s):  
New Species ◽  
Natural History ◽  
East Africa ◽  
East Coast ◽  
British Museum ◽  
Research Organization ◽  
East Coast Fever ◽  
East African ◽  
Veterinary Research ◽  
A New Species

A description is given of the male, female, nymph and larva of Rhipicephalus carnivoralis sp.nov., a parasite of carnivores in East Africa, and its affinities within the genus are discussed.Its developmental periods under laboratory conditions are given and its hosts and distribution in the field are recorded.The author wishes to thank the Director of the East African Veterinary Research Organization for permission to publish this paper. She is also most grateful to all who made field collections of this species for her; to the British Museum (Natural History), London, for the loan of specimens from their collection; to J. P. J. Ross for the loan of specimens from his collection and to D. W. Brocklesby and K. P. Bailey, who carried out the experiments on the transmission of East Coast fever. Dr G. Theiler, Mr G. H. Yeoman, Mr G. M. Kohls, Dr C. M. Clifford and Dr H. Hoogstraal kindly checked the manuscript before publication and made helpful suggestions. Finally, she would like to thank Professor P. C. C. Garnham and Dr Charles Wilcocks for their advice on the name of this tick.

Phenotypic and genetic parameters for lamb weights in a synthetic line of sheep

1980 ◽  
Vol 30 (2) ◽  
pp. 261-269 ◽  
Author(s):  
T. G. Martin ◽  
D. I. Sales ◽  
C. Smith ◽  
D. Nicholson
Keyword(s):  
Least Squares ◽  
Genetic Parameters ◽  
Genetic Correlations ◽  
Animal Breeding ◽  
Research Organization ◽  
Correction Factors ◽  
Component Method ◽  
Breeding Research ◽  
Selection For ◽  
Synthetic Line

ABSTRACTData on 2120 lambs produced over 7 years in the Animal Breeding Research Organization synthetic Dam Line (49% Finn, 22% East Friesian, 16 % Border Leicester and 13 % Dorset Horn) were analysed by least squares. The effects of sex, age of dam, year of birth, birthrearing class, and age of lamb on weights at birth and at 4, 8, 12 and 16 weeks of age were all appreciable. However, pooled within-year correction factors should be adequate in adjusting records for selection. Heritability estimates for weights at the five ages ranged from 0·17 to 0·24 by the sire component method and from 0·18 to 0·28 by regression of offspring on dam. Previous reports of differences in heritability in singles and in twins were not confirmed. Estimates of the genetic correlations among the various lamb weights were high (0·62 to 1·04) indicating that selection for weight at one age should result in increased weights at all ages.

Estimated halothane gene frequency in eight British pig breeding companies

1986 ◽  
Vol 1986 ◽  
pp. 25-25
Author(s):  
O.I. Southwood ◽  
M.K. Curran ◽  
S.P. Simpson ◽  
A.J. Webb
Keyword(s):  
Gene Frequency ◽  
Animal Breeding ◽  
Large White ◽  
Lean Growth ◽  
Research Organisation ◽  
Breeding Research ◽  
Foundation Stock ◽  
Joint Experiment ◽  
Wye College

Eight breeding companies contributed foundation stock for a joint experiment on lean growth at the Animal Breeding Research Organisation (ABRO) and Wye College. All animals were test-mated to halothane positive (HP) reactors and incidences of HP reaction among progeny were used to estimate the frequency of the halothane gene (n) in the original herds. Estimated incidences of HP were compared with those observed in an earlier 1979 survey.260 British Landrace (LR) were test-mated to HP (expected nn) LR at Wye, and 186 Large White (LW), including 18 boars standing at national AI centres, were test-mated to HP LR, Pietrain-Hampshire or LR x (LW x Norwegian Landrace) at ABRO.Offspring were given a 4-minute halothane test at an average age of 50 days in LW and 76 days in LR. Numbers tested and incidences of reaction are shown in Table 1. Herds are coded ‘A’ to ‘I’ for anonymity. Purebred LR in herds A, C, D, E, H and I were halothane testec in advance and only halothane negatives (HN) were supplied for test-mating.

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