Session: Ruminant Nutrition II: Mineral and Vitamin Additives

300 - Effects of Associating Feed Additives on Rumen Ph Dynamics by Feedlot Cattle Fed a High-concentrate Diet

Thursday, July 15, 2021

3:45 PM EST

Location: Kentucky International Convention Center (KICC), L005/009

Author(s)

MB

Maria B. Niehues, n/a

São Paulo State University – UNESP, Botucatu, SP
Botucatu, Sao Paulo
Alexandre Perdigão, PhD

Analyst
DSM Nutritional Products Brazil S.A.
Rio Brilhante, Mato Grosso do Sul

Presenting Author(s)

Victor Valério de Carvalho, PhD

Innovation and Applied Science Supervisor
DSM Nutritional Products Brazil S.A.
São Paulo, Sao Paulo

PDF Slides and Audio

Author(s)

TA

Tiago S. Acedo

DSM Nutritional Products Brazil S.A.
São Paulo, Sao Paulo
GS

Guilherme S. F. M. Vasconcellos, n/a

DSM Nutritional Products, Brazil
São Paulo, Sao Paulo
LM

Luis M. Tamassia

DSM Nutritional Products Brazil A.S., Kaiseraugst, Switzerland
Kaiseraugst, Basel-Landschaft
CL

Cyntia L. L. Martins

São Paulo State University – UNESP, Botucatu, SP
Botucatu, Sao Paulo
Danilo D. Millen

Associate Professor
College of Technology and Agricultural Sciences, São Paulo State University (UNESP), Dracena, Brazil
Dracena, Sao Paulo
MB

Mário B. B. Arrigoni

São Paulo State University – UNESP, Botucatu, SP
Botucatu, Sao Paulo

Our objective was to evaluate the effects of feed additives on ruminal pH of finishing cattle fed a 90%-concentrate diet. Twenty four 18-mo Angus-Nellore crossbred bulls (IBW, 456 ± 6,5 kg) were allocated in a completely randomized design to three treatments with eight replicates each, as follows: 1) Control (MON) - Sodium Monensin (26 mg/kg DM, Rumensin, Elanco Animal Health); 2) Crina® RumistarTM (CR) - a blend of essential oils, 90 mg/kg DM + exogenous α-amylase, 560 mg/kg DM) and 3) CR + HyD® (25-hydroxy-vitamin-D3 at 1 mg/animal/d, CRD, DSM Nutritional Products). The ruminal pH and temperature was monitored individually for 98 days, using a wireless bolus, (SmaXtec Animal Care, Austria). Data were analyzed using the Mixed procedure of SAS and means comparison evaluated by Tukey test at P< 0.05. During adaptation period (i.e. first 14 days), bulls fed CR and CRD had increased rumen mean pH (6.40 and 6.36 vs. 6.16; P < 0.01) and minimum pH (5.89 and 5.87 vs. 5.57; P < 0.01) than bulls fed MON. In addition, rumen pH from bulls fed CR spent less time below 6.0 than bulls fed MON (256.07 vs. 452.62 min/d; P = 0.05). Regarding the total period, bulls fed MON had lower mean (6.22 vs. 6.51 and 6.42, P < 0.01) and minimum rumen pH (5.60 vs. 5.92 and 5.85, P < 0.01) than bulls fed CR and CRD. Additionally, feeding MON increased time duration of rumen pH (390.79 min/day, P < 0.01) and had a larger area below 6.0 (81.52 min x pH units/day; P < 0.01). Moreover, the addition of monensin increased pH time duration below 5.8 (161.10 vs. 121.13 and 122.56 min/day; P = 0.02) compared with CR and CRD, and increased ruminal temperature (39.60 vs. 39.51 and 39.5 °C; P < 0.01). We conclude that feeding Crina® RumistarTM and Crina® RumistarTM HyD® increased the rumen pH of bulls.