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(1)

1

)

22

litters from farms

with

good hygienic

conditions. The weaned

piglets ( 4 6 killed)

harboured

on an average 13

parasites.

The

highest

levels were 97, 95.

8 3 ,

60, 34 or 28 worms.

2

)

8 litters

from farms

with bad or mediocre

lcygienic

conditions. The

piglets ( 1 6 killed)

har-

boured on an average 729

parasites.

The

highest

levels were g 5+5, 1 733, 1 572, 1 377, 612 or 532 worms.

In the sows, the «

peri parturient

egg rise described

by

other authors was not confirmed.

Piglets

should be

prevented

from worm intake

(i) by parasitic

sterilization of the sows before

farrowing ( 2

treatments at y

days interval)

and

( 2 ) by carefully applying

the

hygienic

rules in

the pens where

piglets

are fed with their mothers.

«Rearing

is and can

only

be

hygiene

in action x

(LECLAINCIIE).

Cytochrome P 450 induction by DDT in the pig

and concomitent reduction of retinol

R.

FERRANDO,

R. TRUHAUT

J.-C.

GAK, Claude

GRAILLOT,

Claudine FOURLON

Laboratoire de Recherches de la Chaire de Nutrition et

A li 11l entation, Ecole

nationale vétérinaire

d’Alfort,

7,

avenue dts Général de Gaulle, 94îOl

ilIaisons-.41fo!,t

Piglets receiving

a diet

containing

250 p.p.m. of DDT exhibited a

large

increase in

cytochroi»<:

P .150 in all their liver lobes. This reduction was

accompanied by

a marked reduction in the re- serves of liver retinol i. e. 4I-SI p. ioo as

compared

to the controls.

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