295 Impact of increasing levels of fumonisin on performance of finishing beef steers. (30th November 2020)

• Record Type: Journal Article
• Authors: Jennings, Jenny; Ensley, Steve; Lawrence, Ty; Lockard, Cathy
• Is Part Of: Journal of animal science. Volume 98(2020)Supplement 3
• Page Start: 142
• Page End: 143
• Publication Date: 2020-11-30
• Subjects: Fumonisin Feedlot Cattle Performance; Livestock -- Periodicals; Livestock; Electronic journals; Periodicals; 636.005
• DOI: 10.1093/jas/skaa054.249
• Languages: English
• ISSNs: 0021-8812

Abstract

Abstract: To address the gaps in current scientific knowledge, the objective of the present study was to investigate the impact of fumonisin exposure on feedlot cattle intake and performance. Fifty steers were received (d 0; 361 ± 6.4 kg), and housed individually in 1.8 x 11.0 m pens and fed once daily at 0800 h. Steers were transitioned to a dry-rolled corn-based finishing diet from d 0 to 21 and then were fed the control finishing diet until d 50. Treatment diets were formulated to achieve ≤ 5 ppm (CON), 15 (15PPM), 30 (30PPM), 60 (60PPM), and 90 ppm (90PPM) of total dietary fumonisin. Steers were fed the fumonisin treatment diets from d 50 until harvest on d 160; individual animal body weights were taken on days 0, 50, 100, 150 and 160. Animal performance and carcass data were analyzed using PROC MIXED in SAS with animal as the experimental unit and PROC GLIMMIX was used to analyze categorical carcass data. Contrasts were used to test for linear and quadratic responses. Throughout the study, there was no effect of treatment (P > 0.60), or a linear response (P > 0.16) from increasing fumonisin levels, on BW or DMI. However, CON tended to have lower ADG than the other treatments during the fumonisin treatment period (P = 0.10), and there was a positive linear response (P = 0.02) of ADG to fumonisin dose during the treatment period. Similarly, ADG tended to increase linearly over the entire feeding period (P = 0.06), as did G:F (P = 0.07). There were no differences between treatments regarding HCW, DP, marbling score, ribeye area, or YG. There were no effects of treatment on either liver abscesses (P = 0.95) or telangiectasis (P = 0.13). No differences in body weight, intake, carcass, or liver characteristics were observed in steers fed dietary levels of fumonisin ranging from 8 to 108 ppm for 110 days prior to harvest.