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ORIGINAL PAPER
Effects of ensiled wheat straw with brewer’s spent yeast
on milk production and nutrient utilisation in dairy cows
1
Ethiopian Institute of Agricultural Research, P.O.Box: 2003 Addis Ababa, Ethiopia
2
Department of Animal Nutrition, Poznan University of Life Sciences, Poznan, 60-637, Poland
3
Graduate School of Chinese Agricultural Science, 100081 Beijing, China
4
Department of Animal Science, University of Sydney, 2006 Sydney, Australia
5
Department of Animal Breeding and Product Quality Assessment, Poznan University of Life Sciences, Poznan, 60-637, Poland
6
Department of Internal Medicine and Diagnostics,
Faculty of Veterinary Medicine and Animal Sciences, Poznan University of Life Sciences, Poznan, 60-637, Poland
7
State Key Laboratory of Reproductive Regulation and Breeding of Grassland Livestock, Inner Mongolia University, Hohhot 010020, China
8
Universitas Sebelas Maret, Surakarta 57126, Indonesia
9
Department of Animal Nutrition and Feed Technology, Faculty of Animal Husbandry, Universitas Padjadjaran, 45363 Padjadjaran, Indonesia
10
American Institute for Goat Research, Langston University, Oklahoma 73050, USA
Publication date: 2025-09-04
Corresponding author
A. Cieślak
Department of Animal Nutrition, Poznan University of Life Sciences, Poznan, 60-637, Poland
Department of Animal Nutrition, Poznan University of Life Sciences, Poznan, 60-637, Poland
KEYWORDS
TOPICS
ABSTRACT
Brewer’s spent yeast (BSY) is one of the most abundant byproducts
of the brewing industry that creates environmental disposal challenges.
However, its high nutritional value offers an opportunity to upgrade low-quality
roughages in dairy cows’ nutrition. This study evaluated the effects of ensiled
wheat straw with BSY and molasses on feed intake, digestibility, milk yield, and
methane production in dairy cows compared to untreated wheat straw (UWS).
Wheat straw was ensiled with BSY (0.6 l/kg) and molasses (10%) for five weeks.
Three mid-lactation dairy cows (¾ Friesian × Boran) were assigned to three diets:
UWS + 0.5 kg concentrate/l of milk (UWS+0.5C), ensiled wheat straw (EWS) +
0.5 kg concentrate/l of milk (EWS+0.5C), and EWS + 0.3 kg concentrate/l of
milk (EWS+0.3C). EWS with BSY doubled crude protein content and reduced
in vitro methane production by 28.3% (P < 0.01). EWS diets increased nutrient
intake and digestibility (P < 0.01), except for neutral detergent fibre digestibility
(P > 0.05). Milk yield increased by 1.13 kg/day in EWS+0.3C (P < 0.001),
along with an improvement in milk total solids. Predicted methane emissions
decreased by 15.7% in EWS+0.5C (P < 0.01), and net profit increased by 1.21
USD/day/cow in EWS+0.5C. These results demonstrate that ensiling wheat
straw with BSY and molasses is an effective strategy to improve feed quality,
milk production, sustainability emissions, and economic returns in dairy farming.
FUNDING
This research was partially funded by the Faculty of Veterinary Medicine and Animal Science, Poznan University of Life Sciences, Poland, through the Department of Animal Nutrition (No. 506.533.04.00).
CONFLICT OF INTEREST
The Authors declare that there is no conflicts of interest.
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