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(1)

Comparison of fattening performances of Large White, Belgian

Landrace

and Cross-Bred pigs

J.

LOUGNON

A. E.

C.,

Société de Chimie

organique

et

biologique,

03600

Commentvy

A

single

feed

( 3

300

digestible kcal,

x!.5 p. 100of crude

protein)

was

given

ad libitum to

pigs weighing

between 20and 95

kg.

The animals were either

Large

White

(LW)

or

Belgian

Landvace

(LB)

or Cross-Bred

(CR) (half

castrated

males,

half

females).

The

daily

mean intake of the females was io p. 100lower than that of the males. The LB

pigs

consumed 5 p. ioo less feed than the

LW,

and the CR 5 p. ioo more. The LB reached go

kg

7

days

later and the CR 16

days

earlier than the L W. Feed

efficiency

was the

highest

in the CR

pigs

and the lowest in the LB

pigs.

As

regards body composition,

carcasses of the females were of better

quality

than those of the castrated males

(loin/backfat

ratio : +

3 8

p.

ioo).

As

compared

with

LW,

this ratio was

27 p. ioo

higher

in CR and 50 p. ioo

higher

in LB. When fed ad libitum and on a free

choice,

a cereal-based diet

( 9 - 5

p. xoo of crude

protein)

and a

complementary

feed

( 50

p. 100 of crude

protein),

LW and LB

pigs (castrated

males and

females)

consumed a ration the

protein

level of

which

gradually

decreased from about 20p. ioo at 30

kg

live

weight,

to x! p. 100in LB of both

sexes and in LW females and to 12.5 p. 100in castrated LW after 60

kg

live

weight.

Factors affecting selection of boars in

a

closed line with

a

low degree of inbreeding

J.

NAVEAU

Institut

Technique

du Porc, Service Selection.

149,

rue de

Bercy,

75579 Paris Cedex 12

The aim of this

study

was to establish a programme for the selection and utilization of boars in a closed line with a low

degree

of

inbreeding.

If we admit that it is necessary to have at

least ! 4 boars

on service

simultaneously,

this

study

may lead to the

following simple

rule :

Every

21

days,

selection of a new young boar and elimination of the boar which has

alreadyperformed

the

greatest

number of services.

On condition of an

equivalent

utilization of each boar and of a random

mating

programme

excluding

sib or half-sib

matings,

this method may

give

the

following

results :

Références

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