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Volume 11, Number 8—August 2005

Research

Sheep Feed and Scrapie, France

Sandrine Philippe*, Christian Ducrot†, Pascal Roy‡, Laurent Remontet‡, Nathalie Jarrige*, and Didier Calavas*Comments to Author 
Author affiliations: *Agence Française de Sécurité Sanitaire des Aliments, Lyon, France; †Institut National de la Recherche Agronomique, Theix, France; ‡Centre Hospitalo-Universitaire Lyon-Sud, Lyon, France

Main Article

Table 1

Univariate analysis of potential risk factors

Risk factors Modalities No. controls (%) No. cases (%) Univariate Clog-log model
OR* 80% CI
Direct contacts between flocks and indirect environmental contacts
Purchase of ewes No 227 (65) 55 (59) 1.0
Yes 123 (35) 39 (41) 1.3 1.0–1.8
Purchase of rams No 146 (42) 33 (35) 1.0
Yes 204 (58) 61 (65) 1.0 0.8–1.4
Temporary direct contacts between flocks† No 230 (66) 66 (70) 1.0
Yes 120 (34) 28 (30) 0.7 0.5–1.1
Stay of animals in other flocks with direct contacts No 319 (91) 87 (93) 1.0
Yes 31 (9) 7 (7) 0.7 0.4–1.3
Stay of animals from other flocks with direct contacts No 332 (95) 91 (97) 1.0
Yes 18 (5) 3 (3) 0.8 0.4–1.9
Presence of small ruminants in the vicinity of the farm No 71 (20) 14 (15) 1.0
Yes 279 (80) 80 (85) 1.1 0.7–1.7
Sharing paths No 149 (43) 39 (41) 1.0
Yes 201 (57) 55 (59) 0.9 0.7–1.2
Other indirect environmental contacts‡ No 311 (89) 85 (90) 1.0
Yes 39 (11) 9 (10) 0.7 0.4–1.2
Feeding
Purchase of raw materials§ No 213 (61) 66 (70) 1.0
Yes 137 (39) 28 (30) 0.6 0.4– 0.8
Purchase of milk replacers¶ No 287 (82) 66 (70) 1.0
Yes 63 (18) 28 (30) 2.0 1.4–2.7
Purchase of proprietary concentrates¶ No 79 (23) 7 (7) 1.0
Yes 271 (77) 87 (93) 2.2 1.2–3.8
Purchase of milk replacers from factory 1 No 329 (94) 76 (81) 1.0
Yes 21 (6) 18 (19) 3.1 2.1–4.6
Purchase of milk replacers from other factories No 317 (91) 87 (93) 1.0
Yes 33 (9) 7 (7) 0.9 0.5–1.6
Purchase of proprietary concentrates from factory 1 No 271 (77) 48 (51) 1.0
Yes 79 (23) 46 (49) 2.6 1.9–3.5
Purchase of proprietary concentrates from factory 2 No 292 (83) 85 (90) 1.0
Yes 58 (17) 9 (10) 0.4 0.2–0.7
Purchase of proprietary concentrates from other factories No 228 (65) 54 (57) 1.0
Yes 122 (35) 40 (43) 1.2 0.8–1.7
Other indirect contacts
Artificial insemination No 247 (71) 57 (61) 1.0
Yes 103 (29) 37 (39) 1.0 0.7–1.5
Cesarean section performed by veterinarian No 163 (47) 28 (30) 1.0
Yes 187 (53) 66 (70) 1.9 1.3–2.7
Ear-tagging No 236 (67) 55 (59) 1.0
Yes 114 (33) 39 (41) 1.1 0.8–1.6
Sharing of farming devices No 85 (24) 22 (23) 1.0
Yes 265 (76) 72 (77) 0.7 0.5–1.0
Presence of dogs on the farm No 325 (93) 84 (89) 1.0
Yes 25 (7) 10 (11) 1.1 0.7–1.7
Purchase of hay No 247 (71) 70 (74) 1.0
Yes 103 (29) 24 (26) 0.7 0.5–1.0

*OR, odds ratio; CI, confidence interval.
†Contacts by transhumance or common pastures with contacts between animals.
‡e.g., common pastures without direct contacts between animals.
§Purchase of hay excluded because considered in other indirect contacts.
¶Independently of the factories.

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