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SMITH,A.V. & C.POLGE, 1950. Vet.Rec. S B Gr RIS

PTCKETT;B.W., R.C.HALL, U.J.LUCAS & E.W.GIBSON, 1965.
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JONDET,R., 1964. V. Int. Cong. on Rep. S el e s
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DYRENDAHL,J., 1966. X.Nord.Vet.Cong., II, 736-741.

NAGASE,H. & E.F.GRAHAM, 1964. V.Int.Cong. on Rep.
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GURTILS,; PGe, “A%DFORTEATH & CRROECEsn 1961k v TV Int
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BLOM,E., 1950. Nord.Vet.-Med., 2, 58-61.

 

AAMDAL,J., O N ESE TS (OSBRSS EITH 1966. X.Nordic.
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AAMDAL,J. & K.ANDERSEN, 1968. Zuchthygiene 3, 22-24.

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