Effects of Autolyzed Yeast Supplementation in a High-Starch Diet on Rumen Health, Apparent Digestibility, and Production Variables of Lactating Holstein Cows

Sara E Knollinger; Milaine Poczynek; Bryan Miller; Isabel Mueller; Rodrigo de Almeida; Michael R Murphy; Felipe C Cardoso

doi:10.3390/ani12182445

Effects of Autolyzed Yeast Supplementation in a High-Starch Diet on Rumen Health, Apparent Digestibility, and Production Variables of Lactating Holstein Cows

Animals (Basel). 2022 Sep 16;12(18):2445. doi: 10.3390/ani12182445.

Authors

Sara E Knollinger¹, Milaine Poczynek^{1

2}, Bryan Miller³, Isabel Mueller⁴, Rodrigo de Almeida², Michael R Murphy¹, Felipe C Cardoso¹

Affiliations

¹ Department of Animal Sciences, University of Illinois, Urbana, IL 61801, USA.
² Department of Animal Sciences, Universidade Federal do Paraná, Curitiba 80035-050, PR, Brazil.
³ BIOMIN America Inc., Overland Park, KS 66210, USA.
⁴ BIOMIN Holding GmbH, 3131 Getzersdorf, Austria.

Abstract

Fifteen multiparous rumen-cannulated Holstein cows were assigned to one of five treatments in a replicated 5 × 5 Latin square design. The treatments were low-starch (LS) (22.8 ± 1% of dry matter; DM) without autolyzed yeast (AY; LS0, control), high-starch (HS) (31.2 ± 4% of DM) without AY (HS0), and HS with either 15 g (HS15), 30 g (HS30), or 45 g (HS45) of AY supplementation. Cows in HS0 had increased (p < 0.03) dry matter intake (DMI; 24.9 kg/d) and energy-corrected milk (ECM; 34.4 kg/d) compared to cows in LS0 (19.9 and 31.3 kg/d, respectively). There was a tendency for a quadratic treatment effect for feed efficiency (ECM/DMI, p = 0.07) and crude protein (CP) apparent digestibility (AD) (p = 0.09). Cows in HS45 tended (p = 0.09) to have increased DMI (25.6 kg/d) compared to cows in HS0 (24.9 kg/d). Cows in HS0 had greater (p < 0.04) milk protein nitrogen (N; 166 g/d) and microbial N production (161 g/d) than those in LS0 (140 and 138 g/d, respectively). In conclusion, the addition of AY tended to improve DMI, feed efficiency, and CP AD when cows were fed the HS diet.

Keywords: N excretion; apparent digestibility; feed efficiency; rumen pH; starch; yeast.

Grants and funding

This project was partially supported by BIOMIN Holding GmbH (Austria) and by the USDA National Institute of Food and Agriculture (Washington, DC, USA; NC-2042). The funding sources played no role in the study design or the collection, analysis and interpretation of data, the writing of the report, or in the decision to submit the paper for publication.