DO SOWS NEED STRAW FOR NEST-BUILDING

[1] SENSORY REINFORCEMENT AND ILLUMINATION PREFERENCE IN DOMESTICATED PIG [J]. ANIMAL BEHAVIOUR, 1977, 25 (MAY) : 497 - 507

[2] EFFECTS OF CONDITIONED BEHAVIOR AND ENVIRONMENTAL FACTORS ON PLASMA CORTICOSTEROID LEVELS IN PIGS [J]. PHYSIOLOGY & BEHAVIOR, 1973, 10 (02) : 267 - 274

[3] ILLUMINATION PREFERENCES OF PIGS [J]. APPLIED ANIMAL BEHAVIOUR SCIENCE, 1985, 14 (03) : 233 - 243

[4] BAXTER MR, 1982, DISTURBED BEHAV FARM, P101

[5] APPLIED ETHOLOGY AND ANIMAL-WELFARE [J]. APPLIED ANIMAL ETHOLOGY, 1981, 7 (01): : 3 - 10

[6] BEILHARZ RG, 1982, INT J STUD ANIM PROB, V3, P117

[7] Blackman D., 1974, OPERANT CONDITIONING

[8] BLACKSHAW JK, 1983, INT J STUD ANIM PROB, V4, P299

[9] Buchenauer D., 1981, The welfare of pigs, P75

[10] Cronin G. M., 1985, THESIS AGR U WAGENIN

[1] SENSORY REINFORCEMENT AND ILLUMINATION PREFERENCE IN DOMESTICATED PIG [J]. ANIMAL BEHAVIOUR, 1977, 25 (MAY) : 497 - 507

[2] EFFECTS OF CONDITIONED BEHAVIOR AND ENVIRONMENTAL FACTORS ON PLASMA CORTICOSTEROID LEVELS IN PIGS [J]. PHYSIOLOGY & BEHAVIOR, 1973, 10 (02) : 267 - 274

[3] ILLUMINATION PREFERENCES OF PIGS [J]. APPLIED ANIMAL BEHAVIOUR SCIENCE, 1985, 14 (03) : 233 - 243

[4] BAXTER MR, 1982, DISTURBED BEHAV FARM, P101

[5] APPLIED ETHOLOGY AND ANIMAL-WELFARE [J]. APPLIED ANIMAL ETHOLOGY, 1981, 7 (01): : 3 - 10

[6] BEILHARZ RG, 1982, INT J STUD ANIM PROB, V3, P117

[7] Blackman D., 1974, OPERANT CONDITIONING

[8] BLACKSHAW JK, 1983, INT J STUD ANIM PROB, V4, P299

[9] Buchenauer D., 1981, The welfare of pigs, P75

[10] Cronin G. M., 1985, THESIS AGR U WAGENIN