title: Evaluation of bacterial diversity in the rumen and feces of cattle fed different levels of dried distillers grains plus solubles using bacterial tag-encoded FLX amplicon pyrosequencing.
abstract: Dietary components and changes cause shifts in the gastrointestinal microbial ecology that can play a role in animal health and productivity. However, most information about the microbial populations in the gut of livestock species has not been quantitative. In the present study, we utilized a new molecular method, bacterial tag-encoded FLX amplicon pyrosequencing (bTEFAP) that can perform diversity analyses of gastrointestinal bacterial populations. In the present study, cattle (n = 6) were fed a basal feedlot diet and were subsequently randomly assigned to 1 of 3 diets (n = 2 cows per diet). In each diet, 0, 25, or 50% of the concentrate portion of the ration was replaced with dried distillers grain (DDGS). Ruminal and fecal bacterial populations were different when animals were fed DDGS compared with controls; ruminal and fecal Firmicute:Bacteroidetes ratios were smaller (P = 0.07) in the 25 and 50% DDG diets compared with controls. Ruminal pH was decreased (P < 0.05) in ruminal fluid from cattle fed diets containing 50% compared with 0% DDGS. Using bTEFAP, the normal microbiota of cattle were examined using modern molecular methods to understand how diets affect gastrointestinal ecology and the gastrointestinal contribution of the microbiome to animal health and production.
authors: Food and Feed Safety Research Unit, Southern Plains Agricultural Research Center, Agricultural Research Service, USDA, College Station, TX 77845, USA. todd.callaway@ars.usda.gov
authors: T R
authors: TR
authors: Callaway
authors: S E
authors: SE
authors: Dowd
authors: T S
authors: TS
authors: Edrington
authors: R C
authors: RC
authors: Anderson
authors: N
authors: N
authors: Krueger
authors: N
authors: N
authors: Bauer
authors: P J
authors: PJ
authors: Kononoff
authors: D J
authors: DJ
authors: Nisbet
mesh_terms: D000821:Animal Feed / Q000032:analysis*; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D001419:Bacteria / Q000145:classification* / Q000235:genetics; D002417:Cattle; D004269:DNA, Bacterial / Q000235:genetics; D004032:Diet / Q000662:veterinary*; D002523:Edible Grain / Q000737:chemistry; D005243:Feces / Q000382:microbiology*; D012417:Rumen / Q000382:microbiology*
chemical_list: D004269:DNA, Bacterial