Linked Life Data

20154160

Source:http://linkedlifedata.com/resource/pubmed/id/20154160

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pubmed-article:20154160pubmed:abstractTextBovine viral diarrhea viruses (BVDV) have been isolated alone or in combination with other viral and bacterial pathogens in animals diagnosed with bovine respiratory disease (BRD), a disease causing major economic loss to the feedlot industry. The objective of this experiment was to determine the effects of Mannheimia haemolytica challenge after short-term exposure (72 h) to bovine viral diarrhea virus type 1b (BVDV1b) persistently infected (PI) calves on performance, N balance, and organ mass in finishing cattle. Treatments (6 steers/treatment; initial BW = 314 +/- 31 kg) were 1) steers not exposed to steers PI with BVDV nor challenged with M. haemolytica (control; CON); 2) steers exposed to 2 steers PI with BVDV1b (BVD) for 72 h; 3) steers intratracheally challenged with M. haemolytica (MH); or 4) steers exposed to 2 steers PI with BVDV1b for 72 h and challenged with M. haemolytica (BVD+MH). There were 12 h between exposure to PI steers and challenge with M. haemolytica. Steers were housed in metabolism stanchions during the first 5 d after the M. haemolytica challenge and on d 7 to 11, 28 to 32, and for 5 d before slaughter (average 119 d on feed) to determine N balance and were weighed every 28 d. At slaughter, carcass and organ mass data were collected. Data were analyzed as a randomized complete block design with a 2 x 2 factorial arrangement of treatments, and steer was used as the experimental unit. From d -3 (beginning of PI steer exposure) to 4, steers challenged with M. haemolytica had less (P = 0.04) ADG than steers not challenged with M. haemolytica. In addition, steers exposed to steers PI with BVDV tended (P = 0.09) to have less ADG and G:F across the entire finishing period than steers not exposed to BVDV. Before slaughter, retained N expressed as grams per day (P = 0.03) and as a percentage of N intake (P = 0.04) was less in BVD steers compared with steers not exposed to BVDV. There were no effects (P > 0.10) of BVDV exposure or M. haemolytica challenge on empty BW (EBW) or carcass characteristics. Expressed as a percentage of EBW, HCW was less (P = 0.02) and total offal weight was greater (P = 0.02) for steers challenged with M. haemolytica compared with steers not challenged. Results are in agreement with those reported in larger scale finishing studies and suggest that acute exposure to BRD-related pathogens can have long-term effects on animal performance.lld:pubmed
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pubmed-article:20154160pubmed:articleTitleEffects of exposure to calves persistently infected with bovine viral diarrhea virus type 1b and Mannheimia haemolytica challenge on animal performance, nitrogen balance, and visceral organ mass in beef steers.lld:pubmed
pubmed-article:20154160pubmed:affiliationDepartment of Animal Science, Division of Agricultural Sciences and Natural Resources, Center for Veterinary Health Sciences, Oklahoma State University, Stillwater 74078, USA.lld:pubmed
pubmed-article:20154160pubmed:publicationTypeJournal Articlelld:pubmed