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Oats in the diet of dairy cows : milk production and enteric methane emissions

Fant, Petra (2022). Oats in the diet of dairy cows : milk production and enteric methane emissions. Diss. (sammanfattning/summary) Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880
ISBN 978-91-7760-937-7
eISBN 978-91-7760-938-4
[Doctoral thesis]

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Abstract

The overall aim of this thesis was to investigate whether replacing barley with oats as a grain supplement for dairy cows could reduce enteric methane (CH4) emissions without compromising milk production. Barley is a more common grain supplement in Sweden, mainly due to higher tabulated feeding values suggesting higher milk production with barley than with oats. In the first paper, different varieties of oats and barley were evaluated in vitro. Predicted in vivo CH4 emissions were lower from the oat diets than from the barley diets. In the second paper, barley was replaced by hulled oats as a grain supplement to dairy cows fed a grass silage-based diet. Replacing barley with oats decreased organic matter digestibility and metabolisable energy intake but did not affect milk or energy-corrected milk (ECM) yield. Daily CH4 emissions (g/d) and CH4 intensity (g/kg ECM) decreased by 4.7 and 4.8%, respectively. In the third paper, dairy cows were fed one of four grain supplements: barley, hulled oats, dehulled oats, or a mix of hulled and dehulled oats. Organic matter digestibility and metabolisable energy intake were similar between the barley diet and the oat diets, but milk and ECM yield were higher with the oat diets. Replacing hulled oats with dehulled oats did not affect milk or ECM yield. Daily CH4 emissions were similar between the barley diet and the oat diets. Yet, due to higher ECM yield, CH4 intensity was 5.7% lower with the oat diets. In the fourth paper, we investigated fatty acid composition of milk. Milk fat from cows fed oats contained lower concentrations of saturated fatty acids and higher concentrations of unsaturated fatty acids. In conclusion, replacing barley with oats in the diet of dairy cows does not compromise milk production and could offer a practical strategy to slightly reduce enteric CH4 emissions and to change milk quality to be more in line with dietary guidelines.

Authors/Creators:Fant, Petra
Title:Oats in the diet of dairy cows : milk production and enteric methane emissions
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2022
Number:2022:31
Number of Pages:86
Publisher:Swedish University of Agricultural Sciences
ISBN for printed version:978-91-7760-937-7
ISBN for electronic version:978-91-7760-938-4
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Article category:Other scientific
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 402 Animal and Dairy Science > Animal and Dairy Science.
Keywords:grain supplements, greenhouse gas emissions, sustainability, milk quality, energy utilization
URN:NBN:urn:nbn:se:slu:epsilon-p-116901
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-116901
ID Code:27715
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(NL, NJ) > Dept. of Agricultural Research for Northern Sweden
(VH) > Dept. of Agricultural Research for Northern Sweden
Deposited By: SLUpub Connector
Deposited On:06 May 2022 07:25
Metadata Last Modified:06 May 2022 07:31

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