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Contents

Opening Address
RW Gee ... Page 1

Presidential Address for 1977
PJ Ahrens ... Page 4

Developments Within the Department During the Year
RM Watts, Director-General, NSW Dept of Agriculture ... Page 7

Disease Control in NSW During 1976-77
DH Mumford, Chief, Division of Animal Industry ... Page 12

Control and Eradication of Disease on a National Basis
RW Gee, Director, Australian Bureau of Animal Health ... Page 16

Anthelmintic Efficiency of Non-Benzimadazole Anthemintics Against Benzimidazole Resistant Strain of Haemonchus contortus and Trichostongylus colubriformis
CA Hall, Special Veterinary Research Officer, Glenfield ... Page 24

Enteric Disease and Intestinal Immunity
AJ Husband, Veterinary Research Station, Glenfield ... Page 26

The Place of Feral Animals in Disease Eradication Programmes
JR Giles, Chief, Scientific Services, NPWS ... Page 30

Investigations of the Cause of Sheep Infertility in Individual Sheep Flocks
JW Plant, Special Veterinary Research Officer, Glenfield ... Page 34

Pesticide Residues in the Forbes Pastures Protection District
JB Kemp, Veterinay Inspector, Forbes ... Page 39

Some Field Aspects of DDT Residues in Cattle in the Namoi Valley
JA Macfarlane, Veterinary Inspector, Narrabri / Pilliga Pastures Protection Boards ... Page 53

Hypocalcaemia and Bone Fragility in Lambs Grazing Cereals
EP Buckley, Veterinary Inspector, Wagga Wagga ... Page 63

Toxicity 1080
FL Clark, Veterinary Inspector, Armidale ... Page 66

Feeding Stock in Flood Times
GW Eggleston, Veterinary Inspector, Moree ... Page 72

Micrencephaly and Related Abnormalities in Lambs
HC Grant-Frost, Veterinary Inspector, Coonabarabran ... Page 74

Blue Green Algae Toxicity in Sheep and Cattle
RI Walker, Veterinary Inspector, Young ... Page 78

Blood Testing of Rams - Results and Problems Encountered
JC Thomas, Veterinary Inspector, Mudgee ... Page 81

Parasitic Trials in Sheep - Holbrook District
MR Barry, Veterinary Inspector, Albury / Hume ... Page 90

Reticuloendotheliosis (RE) Virus Infection of Poultry
PT Gilchrist, Veterinary Officer, Dept of Agriculture ... Page 96

Some Factors Contributing to Ill Thrift in Cattle on the Central Coast
JW West, Veterinary Inspector, Maitland ... Page 98