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Comparative Study
. 1980;21(1):1-10.
doi: 10.1186/BF03546894.

Listeriosis in sheep. Listeria monocytogeńes in sheep fed hay or grass silage during pregnancy. Immunological state, white blood cells, total serum protein and serum iron

H Grønstøl
Comparative Study

Listeriosis in sheep. Listeria monocytogeńes in sheep fed hay or grass silage during pregnancy. Immunological state, white blood cells, total serum protein and serum iron

H Grønstøl. Acta Vet Scand. 1980.

Abstract
in English, Norwegian

A comparison was made between a hay fed group, consisting of 23 ewes, and a grass silage fed group of 22 ewes, all pregnant. Excretion of Listeria monocytogenes (Lm) in the faeces and milk, antibody titres in sera and whey and delayed hypersensitivity against Lm, and several blood components were determined. The animals had previously been exposed to Lm, and Lm was isolated from the faeces from several animals when the experiment started.

No significant difference in number of excretors between the 2 groups was found during the experimental period. The haemagglutination titres in both sera and whey were low and on the same level in both groups. The titres were higher in animals with 1 foetus than in animals with more than 1 foetus.

In the first part of the experimental period the silage group had a reduced number of lymphocytes, lower total serum protein values and higher serum iron values, compared with the hay group.

The silage group also had a stronger delayed hypersensitivity reaction against Lm than the hay group, and in the silage group the reaction was significantly stronger in ewes with 3 or more foetuses than in ewes with 1 foetus.

In conclusion, the combined effect of some of the changes found in animals fed grass silage may leave them more susceptible to infections.

Drektige sauer blei delte i 2 grupper. Den eine, på 23 dyr, blei fóra med høy og kraftfór, den andre, på 22 dyr, med silofôr og kraftfôr. Talet på dyr som skilde ut Listeria monocytogenes (Lm) i avføring og mjølk, blei undersøkt, antistoff mot Lm blei titrert og seinka hypersensitivitet mot Lm blei målt. Dessutan blei fleire komponentar i blodet bestemt. Listeriabakterier fanst i dyra sitt miljø, og fleire dyr skilde ut Lm i avføringen då granskinga starta.

Det blei ikkje funne noko tydeleg skilnad mellom tala på utskiljarar i dei to gruppene. Begge gruppene hadde låge antistofftiter mot Lm i sera og mjølk. Dyr med eitt foster hadde høgare titer enn dyr med fleire foster.

I fyrste delen av granskingsperioden hadde silogruppa lågare lymfocytt-tal, lågare innhald i serum av totalprotein og høgare innhald av jern, enn høygruppa.

Silogruppa hadde sterkare seinka hypersensitivitetsreaksjonar mot Lm enn høygruppa, og innan silogruppa var desse reaksjonane sterkare hos dyr med ≥ 3 foster enn hos dyr med 1 foster.

Det ser ut som dei endringane silofóringa fører med seg, kan setja ned motstandskrafta mot infeksjonar.

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References

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