THE EFFECT ON EGG-PRODUCTION OF LAYERS AFTER VACCINATION WITH AN INACTIVATED INFECTIOUS-BRONCHITIS (IB) OIL EMULSION VACCINE ON A MULTI-AGE LAYER FARM IN PAPUA-NEW-GUINEA
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作者:
WERNERY, U
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CENT VET LAB,PORT MORESBY,PAPUA N GUINEACENT VET LAB,PORT MORESBY,PAPUA N GUINEA
WERNERY, U
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DAIVI, K
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CENT VET LAB,PORT MORESBY,PAPUA N GUINEACENT VET LAB,PORT MORESBY,PAPUA N GUINEA