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Abstract
In this study, the effects of screw-pressing prior to ensiling and days of regrowth of perennial ryegrass on fibre digestibility were investigated. Six rumen and duodenal fistulated, multiparous Holstein cows (176±93 days in milk;
mean ± SD) were used in an incomplete 6×4 Latin square design with four periods and a 2×3 factorial arrangement of treatments. The factors were developmental stage of grass at harvest [early (ERL; 35 days of regrowth) and late (LAT; 44 days of regrowth)] and processing prior to ensiling [traditional grass silage (GS; mowed, wilted, and chopped), pulp pressed once (1×P; fresh grass processed using twin-screw press producing the two fractions pulp and green juice), and pulp pressed twice (2×P; half of 1×P was soaked in water and processed a second time)]. Grass of all six treatments ensiled for four months before the digestibility experiment started. A total mixed ration with experimental silages, soybean meal, rolled wheat, and minerals (65.0, 6.60, 26.6, and 1.80% of DM, respectively) was fed in periods of 21 days duration. Two markers (titanium dioxide and chromic oxide) were dosed in the rumen twice a day to determine flow of digesta in duodenum and output in faeces. A model including developmental stage, processing, developmental stage × processing, and period as fixed effects, and cow as random effect was analysed in R. Across
developmental stage, DM intake was lower (14.9 vs 17.5 kg/d; P<0.01) and NDF intake was higher (7.07 vs 5.92 kg/d; P<0.01) for 2×P compared to GS. For rumen and total tract NDF digestibility, an interaction was found between
developmental stage and processing (P<0.05). No effect of processing was observed for ERL (average rumen and total tract NDF digestibility were 73.3 and 76.5%), but an increase was observed with increased processing intensity
for LAT (66.2, 71.5, and 76.6% for rumen, and 71.6, 73.8, and 78.3% for total tract NDF digestibility, for GS, 1×P, and 2×P, respectively). Across developmental stage, the amount of NDF digested in the total tract was higher for 2×P
compared to GS (5.47 vs 4.36 kg/d; P<0.01). The study showed that processing can increase intake of fibre and that processing has the greatest effect on fibre digestibility in more developed grass.
mean ± SD) were used in an incomplete 6×4 Latin square design with four periods and a 2×3 factorial arrangement of treatments. The factors were developmental stage of grass at harvest [early (ERL; 35 days of regrowth) and late (LAT; 44 days of regrowth)] and processing prior to ensiling [traditional grass silage (GS; mowed, wilted, and chopped), pulp pressed once (1×P; fresh grass processed using twin-screw press producing the two fractions pulp and green juice), and pulp pressed twice (2×P; half of 1×P was soaked in water and processed a second time)]. Grass of all six treatments ensiled for four months before the digestibility experiment started. A total mixed ration with experimental silages, soybean meal, rolled wheat, and minerals (65.0, 6.60, 26.6, and 1.80% of DM, respectively) was fed in periods of 21 days duration. Two markers (titanium dioxide and chromic oxide) were dosed in the rumen twice a day to determine flow of digesta in duodenum and output in faeces. A model including developmental stage, processing, developmental stage × processing, and period as fixed effects, and cow as random effect was analysed in R. Across
developmental stage, DM intake was lower (14.9 vs 17.5 kg/d; P<0.01) and NDF intake was higher (7.07 vs 5.92 kg/d; P<0.01) for 2×P compared to GS. For rumen and total tract NDF digestibility, an interaction was found between
developmental stage and processing (P<0.05). No effect of processing was observed for ERL (average rumen and total tract NDF digestibility were 73.3 and 76.5%), but an increase was observed with increased processing intensity
for LAT (66.2, 71.5, and 76.6% for rumen, and 71.6, 73.8, and 78.3% for total tract NDF digestibility, for GS, 1×P, and 2×P, respectively). Across developmental stage, the amount of NDF digested in the total tract was higher for 2×P
compared to GS (5.47 vs 4.36 kg/d; P<0.01). The study showed that processing can increase intake of fibre and that processing has the greatest effect on fibre digestibility in more developed grass.
Originalsprog | Engelsk |
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Titel | Book of Abstracts of the 72nd Annual Meeting of the European Federation of Animal Science |
Redaktører | E. Strandberg, L. Pinotti, S. Messori, D. Kenny, M. Lee, J.F. Hocquette, V.A.P. Cadavez, S. Millet, R. Evans, T. Veldkamp, M. Pastell, G. Pollott |
Antal sider | 1 |
Forlag | Wageningen Academic Publishers |
Publikationsdato | aug. 2021 |
Sider | 336-336 |
ISBN (Trykt) | 978-90-8686-366-2 |
ISBN (Elektronisk) | 978-90-8686-918-3 |
DOI | |
Status | Udgivet - aug. 2021 |
Begivenhed | 72nd Annual Meeting of the European Federation of Animal Science - Congress Centre Davos, Davos, Schweiz Varighed: 29 aug. 2021 → 3 sep. 2021 |
Konference
Konference | 72nd Annual Meeting of the European Federation of Animal Science |
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Lokation | Congress Centre Davos |
Land/Område | Schweiz |
By | Davos |
Periode | 29/08/2021 → 03/09/2021 |
Navn | EAAP Book of Abstracts |
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Vol/bind | 27 |
ISSN | 1382-6077 |
Fingeraftryk
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Fiber digestibility and protein value of pulp silage for lactating dairy cows: Effects of wet fractionation by screw pressing of perennial ryegrass
Hansen, N. P., Jensen, S. K., Johansen, M., Hellwing, A. L. F., Ambye-Jensen, M., Larsen, M. & Weisbjerg, M. R., feb. 2023, I: Journal of Dairy Science. 106, 2, s. 937-953 17 s.Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avis › Tidsskriftartikel › Forskning › peer review
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Digestibility of grass fibre increased by screw pressing in bio-refinery
Hansen, N. P., Weisbjerg, M. R., Johansen, M. & Jensen, S. K., 2021.Publikation: Konferencebidrag › Poster › Forskning › peer review
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Aktiviteter
- 1 Deltagelse i eller organisering af konference
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Annual meeting of the European federation of animal science
Hansen, N. P. (Deltager)
30 aug. 2021 → 3 sep. 2021Aktivitet: Deltagelse i eller arrangement af en begivenhed - typer › Deltagelse i eller organisering af konference