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Effect of Plant Extract Supplementation on Escherichia coli O157:H7 and Salmonella Carcass Isolation in Young Holstein Bulls Fed a High-Concentrate Diet

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Abstract:

Ninety Holstein bulls were used in a complete randomized design to study the effect of a blend of plant extract (PE) supplementation on jejunum, cecum, and rectum microbiota (Escherichia coli and lactic acid bacteria [LAB]) and hide and carcass contamination (identification of E. coli O157:H7 and Salmonella). Three treatments—control (CTR), monensin (MON), and PE—were tested. Bulls were offered straw and concentrate ad libitum during 108 d. In the cecum, the percentage of LAB counts below 5 log CFU/ml was greater (P < 0.01) in MON (68.1%) than in CTR (34.6%) and PE (28.0%) treatments. On hide, Salmonella was detected (P < 0.05) in CTR (13.3%) and MON (10.0%) treatments, in contrast to PE (0%) treatment. In bulls fed high-concentrate diets supplemented with PE, no increase of carcass E. coli O157:H7 and Salmonella identification was observed.

Document Type: Research Article

Affiliations: 1: Grup de Recerca en Nutrició, Maneig, i Benestar Animal, Unitat de Remugants–IRTA (Institut de Recerca i Tecnologia Agroalimentàries), Caldes de Montbui 08140, Spain 2: Departament de Sanitat i d'Anatomia Animals de la Universitat Autónoma de Barcelona 08193, Spain 3: Grup de Recerca en Nutrició, Maneig, i Benestar Animal, Unitat de Remugants–IRTA (Institut de Recerca i Tecnologia Agroalimentàries), Caldes de Montbui 08140, Spain; ICREA (Institució Catalana de Recerca i Estudis Avançats), Barcelona, 08010, Spain

Publication date: January 1, 2009

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