Averdunk, G

Brascamp, EW

Duniec, H

Gajic, Z

Legault, C

Lindhé, B

Steane, DE

English

PubMed

B Lindhé

G Averdunk

EW Brascamp

H Duniec

Z Gajic

C Legault

DE Steane

Springer - Publisher Connector

I. - Détermination de la valeur génétique des porcs
ESTIMATION OF BREEDING VALUE IN PIGS
REPORT OF A WORKING GROUP:
B. LINDHÉ, G. AVERDUNK, E. W. BRASCAMP, H. DUNIEC,
Z. GAJIC,C. LEGAULT D. E. STEANE
The present investigation has given some information on testing procedures and combi-
nations, the breeding goal, which variates that are recorded, how they are recorded, how indexes
are presented and finally the direction of the genetic gain. No information has been collected
on selection intensities or lengths of generation intervals.
The presentation given does not give a complete picture of advantages or disadvantages
of selection programs of all individual countries. It has not been possible to include and com-
ment all « specific » solutions. The main shortage, however, is the lack of information of breed-
ing companies, which play a significant role in pig breeding in some European countries.
Under the different headings comments have been made on testing procedures and details
in recording techniques. A more general problem is the possible interaction between central
test practices and commercial production systems. STANDAL (1977) found that genetic correla-
tions between « the same » characters tested at station and on the farm deviated significantly from
unity, indicating a genotype-environment interaction. One explanation proposed was a pos-
sible genotype sex interaction. The problem nevertheless remains. An examination of the
validity of station test records might be worth while in many countries.
The possible existence of genotype-sex interaction might be considered in the design of
national breeding programs. All countries except Great Britain have made the implicit assump-
tion of no interaction between any of the "sexes". To what extent this assumption reduces the
efficiency of a program is probably difficult to estimate.
CURRENT STATUS APPLICATION OF THE SELECTION INDEX THEORY IN PIG BREEDING
K. RÖNNINGEN
Inst. f. Husdjursloradling Lantbrukshoegskolan,
S-750 07 Uppsala 7, Sweden
In the present report we have discussed the current status of application of the selection
index theory in pig breeding. It seems justifiable to state that still more developmental and
extension work will have to be carried out in order to make full use of the theory. In particular,
more research should be devoted to: (i) defining the aggregate genotype in a more suitable way,
(ii) estimating genetic parameters (including heterotic effects), (iii) developing a data bank,
including simplifications, and (iv) evaluating the more recent methods of ranking potential breed-
ing animals.
APTITUDE AU NOURRISSAGE ET AMÉLIORATION GÉNÉTIQUE
DE LA PRODUCTIVITÉ DES TRUIES
C. LEGAULT
LN.R.A., Département de Génétique animale
C.R.Z., 78350 Jouy-en-Josas, France
La fourniture périodique aux éleveurs et aux techniciens chargés de les conseiller d’informa-
tions objectives sur les composantes de la productivité numérique du troupeau a contribué lar-
gement à l’obtention d’un progrès spectaculaire (au rythme annuel de 0,4 à 0,5 porcelet sevré-
truie-an dans les races Large White et Landrace Français). Ce progrès est d’autant plus marqué que
l’élevage est plus spécialisé et plus grand : il provient essentiellement de l’amélioration des tech-


Estimation of breeding value in pigs report of a working group

Crossref

Legault C

Gajic Z

Duniec H

Brascamp EW

Averdunk G

Lindhé B

Steane DE

Directory of Open Access Journals

Genetics Selection Evolution

B. LINDHÉ

G. AVERDUNK

E. W. BRASCAMP

H. DUNIEC

Z. GAJIC

C. LEGAULT

D. E. STEANE

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ESTIMATION OF BREEDING VALUE IN PIGS  REPORT OF A WORKING GROUP

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Estimation of breeding value in pigs report of a working group

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