Effects of bismuth subsalicylate and calciumammonium nitrate on in vitro fermentation of a high-concentrate substrate

An experiment was performed to determine the effects of bismuth subsalicylate (BSS) and calciumammonium nitrate (CAN) on in vitro fermentation of a high-concentrate (87% concentrate, DM basis) substrate. Serum bottles containing 20 mL of a 2:1 buffer:ruminal fluid inoculum and 0.2 g of substrate wer...

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Bibliographic Details
Published in:Journal of animal science 2019-07, Vol.97, p.11-12
Main Authors: Mejia-Turcios, Sebastian E, Stotz, Miranda K, Osorio, Andrea M, Urso, Philip M, Jennings, Thomas G, Espinoza, Nadira, Kondratovich, Lucas, Carvalho, Luis F, Sandes, Michael D, Sarturi, Jhones O, DiLorenzo, Nicolas, Crossland, Whitney, Henry, Darren D
Format: Article
Language:English
Subjects:
Ammonia
Bismuth
Bismuth subsalicylate
Cattle
Digestibility
Feeds
Fermentation
Gas production
Hydrogen sulfide
Inoculum
Nitrates
Organic matter
Substrates
Tubes
Urea
Ureas
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Summary:An experiment was performed to determine the effects of bismuth subsalicylate (BSS) and calciumammonium nitrate (CAN) on in vitro fermentation of a high-concentrate (87% concentrate, DM basis) substrate. Serum bottles containing 20 mL of a 2:1 buffer:ruminal fluid inoculum and 0.2 g of substrate were incubated for 24 h. Four ruminally cannulated steers (BW = 520 ± 30 kg) were used as ruminal fluid donors and each donor was considered a block. Treatments were arranged in a 2 × 2 factorial with the following factors: BSS (0 or 0.33%, DM basis) and CAN (0 or 2.22%, DM basis). Treatments were made isonitrogenous with urea. In vitro organic matter digestibility (IVOMD) was determined in separate 100- mL centrifuge tubes. Data were analyzed using the MIXED procedure of SAS with the fixed effect of BSS, CAN, BSS × CAN, and the random effect of donor. An interaction (P < 0.01) was observed for total gas production (TGP). When CAN was included, without BSS, TGP was increased (P < 0.01); however, the combination of CAN with BSS did not affect (P = 0.85) TGP when compared to the combination of urea and BSS. Ammonia-N tended (P = 0.10) to increase when CAN was used as N source rather than urea. In vitro OM digestibility (P > 0.23) and final pH (P > 0.66) of in vitro ruminal fermentation were not affected by treatments. A tendency (P = 0.06) for an interaction regarding the production of H2S was observed; however, there were no treatment mean differences (P > 0.28). The combination of CAN and BSS did not negatively affect in vitro fermentation parameters such as OM digestion and gas production; however, a reduction in H2S with the combination of BSS and CAN may indicate potential benefits of such feeding strategies for feedlot cattle
ISSN:0021-8812
1525-3163