148 - Effect of Increasing Sodium Sulfate in Water on Intake on Ruminal Fermentation and the in vitro Effect of Bismuth Subsalicylate on Gas Production and NDF Digestibility

Tuesday, June 28, 2022

8:45 AM – 9:00 AM CT

Location: Oklahoma City Convention Center, 302A

Presenting Author(s)

Mikaela G. Evans

Graduate Student
University of Saskatchewan
Saskatoon, Saskatchewan

Author(s)

Gabriel O. Ribeiro, n/a

Assistant Professor
Department of Animal and Poultry Science, College of Agriculture and Bioresources, University of Saskatchewan, Saskatoon, SK, Canada S7N 5A8
Saskatoon, SK
DH

Darren H. Henry

Department of Animal and Dairy Science, University of Georgia – Tifton Campus, Tifton, GA 31793-5766, USA
Tifton, GA
JJ

Jordan A. Johnson

Government of Saskatchewan, Ministry of Agriculture
Regina, SK
JC

John R. Campbell

Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan
Saskatoon, SK
CW

Cheryl Waldner

Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan
Saskatoon, SK
Gregory B. Penner, Ph.D., M.Sc., B.Sc.

Professor
Department of Animal and Poultry Science, College of Agriculture and Bioresources, University of Saskatchewan, Saskatoon, SK, Canada S7N 5A8
Saskatoon, SK

Abstract: This study evaluated in vivo effects of increasing sulfate concentrations of drinking water on dry matter intake (DMI), water intake, ruminal fermentation, and apparent total-tract digestibility, and in vitro effects of water sulfate and bismuth subsalicylate (BSS) dose. Eight ruminal-cannulated beef heifers (382 ± 45 kg) were stratified into two complete and one incomplete 3×3 Latin squares with 28 d periods. Water contained 341 ± 29 (LS), 2,785 ± 71 (MS), or 4,948 ± 163 mg/L (HS) sulfate. Feed and water intake, ruminal fermentation, and nutrient digestibility were evaluated. Ruminal gas samples were collected every 4 h on d 27 to analyze hydrogen sulfide (H₂S) concentration. At the end of each period, digesta collected from heifers in the complete Latin squares were used for in vitro incubation to evaluate water sulfate and BSS dose (0.0, 0.2, 0.4, and 0.6% dry matter). Water intake was 7 L/d greater (P < 0.01) for HS than LS, while MS did not differ. Water sulfate did not affect DMI, but total sulfur intake increased with increasing water sulfate concentration (P < 0.01). Heifers drinking MS and HS had greater ruminal H₂S for 10.5 h after water provision and HS continued to be greater for another 4 h relative to LS (sulfate hour, P < 0.01). Ruminal SCFA concentration, molar proportions of major acids, and nutrient digestibility were not affected (P≥0.19). There were no interactions between water sulfate and BSS in vitro. In vitro H₂S production (µg/48 h) increased with increasing sulfate concentration (P < 0.01) and was reduced (P=0.05) by BSS inclusion. Neutral detergent fiber digestibility was not affected by sulfate or BSS. Increasing water sulfate concentrations did not negatively affect water or feed intake but did increase H₂S concentration and production in vivo and in vitro, respectively. Bismuth subsalicylate may be a potential strategy to reduce H₂S production.