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Grass silage pulp as a dietary component for high-yielding dairy cows

Published online by Cambridge University Press:  23 December 2019

O. Savonen Open the ORCID record for O. Savonen [Opens in a new window] ,
M. Franco ,
T. Stefanski ,
P. Mäntysaari ,
K. Kuoppala  and
M. Rinne Open the ORCID record for M. Rinne [Opens in a new window]
O. Savonen*
Affiliation:
Natural Resources Institute Finland (Luke), FI-31600Jokioinen, Finland
M. Franco
Affiliation:
Natural Resources Institute Finland (Luke), FI-31600Jokioinen, Finland
T. Stefanski
Affiliation:
Natural Resources Institute Finland (Luke), FI-31600Jokioinen, Finland
P. Mäntysaari
Affiliation:
Natural Resources Institute Finland (Luke), FI-31600Jokioinen, Finland
K. Kuoppala
Affiliation:
Natural Resources Institute Finland (Luke), FI-31600Jokioinen, Finland
M. Rinne
Affiliation:
Natural Resources Institute Finland (Luke), FI-31600Jokioinen, Finland
*
†E-mail: outi.savonen@gmail.com
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Abstract

Green biorefineries provide novel opportunities to use the green biomass efficiently and utilize the ecosystem services provided by grasslands more widely. The effects of the inclusion of fractionated grass silage solid fraction (pulp) on feed intake, rumen fermentation, diet digestion and milk production in dairy cows were investigated. Pulp was separated from grass silage using a screw press simulating a green biorefinery. Partial removal of liquid from forage increased DM concentration from 220 to 432 g/kg and NDF from 589 to 709 g/kg DM while CP decreased from 144 to 107 g/kg DM. A feeding trial using an incomplete changeover design with 24 Nordic Red cows and two 3-week periods was conducted. The pulp replaced grass silage in the diet at 0 (P0), 25 (P25) and 50 (P50) percentage of total forage, which was fed ad libitum with 13 kg of concentrate for all treatments. The forage DM intake was highest on P25 (14.1 kg/day) while P0 and P50 did not differ from each other (13.2 and 13.0 kg/day, respectively). There were no differences between the treatments in rumen pH or ammonia N, but the proportion of acetate increased with increasing pulp inclusion. The digestibility was measured using acid insoluble ash and indigestible NDF (iNDF) as internal markers. Neither of the markers detected differences in NDF digestibility, but according to iNDF, apparent total tract organic matter digestibility decreased with increasing pulp inclusion. The cows maintained milk production at P25, but it showed some decline at P50 (energy-corrected milk at P0 and P25 was 39.8 kg/day while for P50, it was 38.5 kg/day, P = 0.056) and the milk protein yield significantly declined with higher pulp inclusion. Simultaneously, the nitrogen use efficiency in milk production increased. It seems that the fibrous grass-based fraction from a biorefinery process has potential to be used as a feed for ruminants.

Keywords

biorefineryfibreforageliquid–solid separationruminant
Type
Research Article
Information
animal , Volume 14 , Issue 7 , July 2020 , pp. 1472 - 1480
Copyright
© The Animal Consortium 2019

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