gave symptoms

(1)

a strain of

embryonated

eggs isolated from faeces

gave symptoms

at a very low level : ^I^ooo

eggs/

pig.

- 25 strains isolated in ^ourarea ^werenot

really pathogenic

^if

pulmonary

^lesions^on^mice

are the criteria

(B R oivN

^and

C HA N-).

- Strains isolated from faeces are ineffective on

mice,

^but

highly pathogenic

^on^swine.

They

could be considered as more harmful for swine than those

coming

from dissection or from

laying,

but cannot be selected on mice.

- It is necessary to

give

less than 500

eggs/piglet

^{if the}

eosinophilic

reaction has to be avoided. For

high

numbers this reaction is

strong,

but short in time.

In contrast with natural infestation so easy ^to

bring

^about

by

^meredeterioration of the

hygie-

nic conditions,

experimental

infestation is difficult to obtain as the

parasites

go

through

^{the small}

intestine and donat remain inside this organ at ^a

regular

^level.

However, liver or

lung

passage is

quite

easy ^tocontrol and manage.

Swine gastro-intestinal parasites in France.

Contribution

to

the epidemiology ^of Hyostrongylus

^rubidus

after

worm counts

in adult

sows

and boars

at

the Slaughter-House

J. P. RAYNAUD

Station de I?echerchcs ^et

Développement

vétérinaire,

Pfizer International,

B. P.

42,

37400 Amboise

(France)

Stomach

parasites

and egg counts in adult ^sowsand boars from

family breedings

^{and small}

size units were controlled.

Among

4 075 stomachs examined, 27.9 p. ¹⁰⁰

( I i3!)

^wcrcfound with worms. Out of 33 animals with

parasites

^{in the}^stomach,egg ^counts^were

important

^for

Ascaris, Oesophagostomum

and

Hyostvongylus.

For an average

of 573 Hyostvongylus eggs/gramme

^anaverage

of 6 4 66t Hyostrongytus including qi 6i

4

^adults

(values

^from

3 6 0

^to

205 6 00 )

^wasfound in the stomach. Those

figures

^areconsiderable.

Homocytotropic antibodies in the pig

J. J. METZGER,

P. ROUZE, Ch. BOURDIEU M. HOUDAYER Laboratoire de

Pathologie porcine,

^{1. N. 12.}^A.,^.,

78850

Tlciverval-Gvignon

Immunization of

pigs

^{with hen}

egg-white lysozyme

in the presence of

complete

^Freund’s

adjuvant gives

^rise^to

homocytotropic

antibodies the kinetics of which

parallel

^{those of}

early

antibodies.

Through gel-filtration, however,

^those

reaginic

antibodies bchaved as

7

S molecules.

gave symptoms

embryonated

gave symptoms

eggs/

pig.

really pathogenic

pulmonary

(B R oivN

C HA N-).

mice,

highly pathogenic

They

coming

laying,

give

eggs/piglet

eosinophilic

high

strong,

bring

by

hygie-

experimental

parasites

through

regular

lung

quite

Swine gastro-intestinal parasites in France.

Contribution

the epidemiology of Hyostrongylus

after

in adult

and boars

the Slaughter-House

J. P. RAYNAUD

Développement

Pfizer International,

42,

(France)

parasites

family breedings

Among

( I i3!)

parasites

important

Ascaris, Oesophagostomum

Hyostvongylus.

of 573 Hyostvongylus eggs/gramme

of 6 4 66t Hyostrongytus including qi 6i

4

(values

3 6 0

205 6 00 )

figures

Homocytotropic antibodies in the pig

J. J. METZGER,

Pathologie porcine,

Tlciverval-Gvignon

pigs

egg-white lysozyme

complete

adjuvant gives

homocytotropic

parallel

early

Through gel-filtration, however,

reaginic

7

the epidemiology ^of Hyostrongylus