ISSUE FOCUS 36 FEED & ADDITIVE MAGAZINE July 2023 - Alleviate weight gain losses: + 5.8 Kg of gain after 28 days of supplementation (Figure 1). • Live yeast for improved rumen function under stress Nutrition can also help reduce inflammation and limit digestive stress. In 2020, Perdormo et al., showed that the live yeast S. cerevisiae CNCM I-1077, fed at a specific heat stress dosage (20x109 CFU/head/day), reduces signs of inflammation with less inflammatory compounds found in blood samples (Figure 2). This study also shows improvement of visible signs, such as rumination behavior that can be linked to improved digestive welfare. Another study conducted in Italy (2015) on a commercial farm with Charolais cattle showed a 5% increase in ADG under a THI around 70 when the animals received S. cerevisiae CNCM I-1077 as compared to controls. Moreover, this study used a pH bolus system, which allows measurement of the ruminal pH in real time. It confirmed that rumen pH decreases in conditions of heat stress (Figure 3) and is linked to strong variations of feed intake and loss of saliva buffering capacity (panting). 100 90 80 70 60 50 40 30 THI THI mean THI min THI max Rumen pH 6,8 6,6 6,4 6,2 6,0 5,8 5,6 5,4 1 7 13 19 25 31 37 43 49 55 61 67 73 79 85 91 97 Days Control Levucell SC Figure 3 A. Effect of LEVUCELL SC on rumen pH variations. Figure 3 B. Variations of the temperature-humidity index (THI) for the same period (Italy, 2015). Serum Amyloid A (µg/mL) 85 80 75 70 65 60 55 79,2 Control LEVUCELL SC 66,3 Figure 2. Effect of rumen specific live yeast (CNCM-I 1077) supplementation during heat stress period on Serum Amyloid A (blood inflammation biomarker) (From Perdomo at el., 2020). Average Body Weight (kg) 260 250 240 230 220 210 200 D0 Control MELOFEED + ALKOSEL D28 +5.8 kg Figure 1. Effect of MELOFEED + ALKOSEL supplementation on bulls during heat stress periods on total weight gain (Lallemand Animal Nutrition internal data. 2016. Commercial farm, France)
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