scholarly journals Animal Breeding Research Organization

Nature ◽  
1952 ◽  
Vol 169 (4301) ◽  
pp. 568-568
Keyword(s):  
Animal Breeding ◽  
Research Organization ◽  
Breeding Research

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.

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.

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.

Improvement of biological efficiency, Animal breeding: contributions to the efficiency of livestock production

1973 ◽  
Vol 267 (882) ◽  
pp. 131-144 ◽  
Keyword(s):  
Food Production ◽  
Livestock Production ◽  
Reproductive Rate ◽  
Animal Breeding ◽  
Scientific Study ◽  
Biological Efficiency ◽  
Factory Farming ◽  
Production Methods ◽  
Breeding Research ◽  
Hill Farming

Biological efficiency is an elastic term that commonly refers to comparisons of some aspect of animal performance at individual or herd level. It is useful in reviewing the opportunities for improvement by animal breeding to stretch the term to cover the biological efficiency of whole industries and thus their ability to compete for resources. Past improvements in the productivity of livestock, especially of pigs and poultry, suggests that genetical progress tends to be contemporary with advances in husbandry, scale, and other aspects of management; that ruminants are relatively backward; and that reproductive rate has so far not contributed fully to the improvements. The conflict of objectives that follows from diversity in production methods that range from hill-farming to factory farming needs resolving. Most of the prospective contributions from animal breeding research imply an emphasis on intensive systems and on efficient food production. Since society at large has other interests as well, there is a case for initiating an articulate and scientific study of the facts, methods and principles of livestock policy with a view to identifying national priorities.

University Animal Breeding Research

1977 ◽  
Vol 44 (2) ◽  
pp. 303-306
Author(s):  
R. L. Willham
Keyword(s):  
Animal Breeding ◽  
Breeding Research

A Feeding Experiment with Twin Cattle

1953 ◽  
Vol 1953 (2) ◽  
pp. 76-85
Author(s):  
J. W. B. King
Keyword(s):  
Dairy Cattle ◽  
Animal Breeding ◽  
Cattle Population ◽  
Feeding Experiment ◽  
The West ◽  
Research Organisation ◽  
Breeding Research ◽  
West Midlands

Since 1948 the Animal Breeding Research Organisation has been collecting twin cattle in the West Midlands of England. The dairy cattle population here is dense—an important factor in reducing cost of collection. Propaganda was issued in various forms all directed at getting in touch with farmers owning one-egg twins, i.e. twins originating from the splitting of a single fertilised egg as distinct from two-egg twins coming from two fertilised eggs. As the twinning rate in cattle is only 1-2% of all births, and probably only about 1 in 20 of these twins are one-egg, their purchase and collection under British conditions is rather costly. Up to the end of 1952, 103 pairs of one-egg heifers twins had been collected.

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