potential of rapeseed feeds and red clover
Gidlund, Helena
(2017).
Domestic protein feeds in dairy production.
Diss. (sammanfattning/summary)
Umeå :
Sveriges lantbruksuniv.,
Acta Universitatis Agriculturae Sueciae, 1652-6880
; 2017:36
ISBN 978-91-576-8845-3
eISBN 978-91-576-8846-0
[Doctoral thesis]
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PDF ((Summary part of the thesis - "kappan"))
390kB |
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PDF (Errata)
72kB |
Abstract
The purpose of the four studies that form the basis for this thesis was to extend the knowledge about how to utilize the domestic protein feeds in Swedish dairy production. To optimize the use of nitrogen (N) from both concentrates and forages into milk product, and thereby improving the profitability and the resilience of the domestic dairy farms.
In a study where soybean meal was replaced with solvent-extracted, heat-moisture-treated rapeseed meal, milk yield and milk protein yield increased and nitrogen use efficiency was higher with rapeseed meal supplementation. Methane yield (g CH4/kg dry matter intake) and methane intensity (g CH4/kg energy-corrected milk) decreased quadratically with increased dietary crude protein concentration.
Increasing the proportion of red clover silage in the diet did not reduce the need for protein supplementation. While the cows were still responsive to protein supplementation as heat-moisture-treated rapeseed expeller, incremental protein intake from red clover did not increase feed intake or milk yield. The changes observed with increased red clover silage intake were attributed to decreased nitrogen use efficiency and increased milk urea nitrogen. Increased protein supplementation decreased methane yield.
Replacing crimped barley with solvent-extracted, heat-moisture-treated rapeseed meal to increase dietary crude protein concentration was associated with greater total neutral detergent fibre digestibility and potentially digestible detergent fibre digestibility. The digestion rate of potentially digestible detergent fibre also increased. Omasal flow of non-ammonia nitrogen increased with increased protein supplementation, but simultaneously the flow of microbial non-ammonia nitrogen and microbial efficiency tended to decrease, with the calculated proportion of milk protein originating from rumen microbial protein showing a marked decline.
Omasal crude protein flow and milk protein yield were positively related to in vitro-estimated utilisable crude protein flow at the duodenum. Moreover, there was a strong correlation between estimated utilisable crude protein (g/kg DM) at 16, 20 and 24 hours of incubation, but results at 16 hours resulted in the best mixed model fit.
Overall, these findings show that with grass silage-based diets Swedish dairy cows could theoretically maintain or even increase milk yield when fed only domestic rapeseed meal as protein feed.
Authors/Creators: | Gidlund, Helena | ||||||||||
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Title: | Domestic protein feeds in dairy production | ||||||||||
Subtitle: | potential of rapeseed feeds and red clover | ||||||||||
Series Name/Journal: | Acta Universitatis Agriculturae Sueciae | ||||||||||
Year of publishing : | 2017 | ||||||||||
Depositing date: | 28 March 2017 | ||||||||||
Number: | 2017:36 | ||||||||||
Number of Pages: | 66 | ||||||||||
Papers/manuscripts: |
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Place of Publication: | Umeå | ||||||||||
Publisher: | Department of Agricultural Research for Northern Sweden, Swedish University of Agricultural Sciences | ||||||||||
ISBN for printed version: | 978-91-576-8845-3 | ||||||||||
ISBN for electronic version: | 978-91-576-8846-0 | ||||||||||
ISSN: | 1652-6880 | ||||||||||
Language: | English | ||||||||||
Publication Type: | Doctoral thesis | ||||||||||
Full Text Status: | Public | ||||||||||
Agris subject categories.: | L Animal production > L02 Animal feeding | ||||||||||
Subjects: | (A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 402 Animal and Dairy Science > Animal and Dairy Science. | ||||||||||
Agrovoc terms: | dairy cows, feeds, protein concentrates, milk production, efficiency, rapeseed, legumes, sweden | ||||||||||
Keywords: | ruminant, protein supplement, nitrogen efficiency, rapeseed, legume | ||||||||||
URN:NBN: | urn:nbn:se:slu:epsilon-e-4043 | ||||||||||
Permanent URL: | http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-4043 | ||||||||||
ID Code: | 14204 | ||||||||||
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: | Ms Helena Gidlund | ||||||||||
Deposited On: | 28 Mar 2017 08:54 | ||||||||||
Metadata Last Modified: | 10 Sep 2020 13:41 |
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