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| Virkajärvi, Perttu; Sairanen, Auvo; Nousiainen, Jouni I.; Khalili, Hannele. |
| The timing of turnout is an important factor affecting the grazing management of dairy cows. However, its consequences are not well known in the short grazing season of northern Europe. Thus, the effect of the turnout date of dairy cows to pasture on sward regrowth, herbage mass production and milk production was studied in two experiments, 1) a grazing trial with 16 Holstein-Friesian dairy cows and 2) a plot trial where the treatments simulated the grazing trial. The treatments were early turnout (1 June) and normal turnout (6 June). Early turnout decreased the annual herbage mass (HM) production in the plot trial (P=0,005), but due to a higher average organic matter (OM) digestibility (P<0,001) the difference in digestible OM yield was not significant... |
| Tipo: Journal paper |
Palavras-chave: Feeding and growth. |
| Ano: 2003 |
URL: http://orgprints.org/16831/1/virkaj%C3%A4rvi.pdf |
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| Virkajärvi, Perttu. |
| Post-defoliation carbohydrate stores, leaf area and the number of active meristems are important factors affecting the subsequent regrowth of grasses. Defoliation height affects the magnitude of all these factors. Timothy (Phleum pratense L.) and meadow fescue (Festuca pratensis Huds.) are the two most common pasture species in Finland, but little is known about their response to defoliation height. In this study the effect of three defoliation heights, 3, 6 and 9 cm, on the regrowth rates of timothy and meadow fescue in both the generative (June–July) and vegetative (August) phases of growth were examined in two one-year experiment in year 2000 and 2001. In addition, the main postdefoliation parameters were measured and their contributions to regrowth... |
| Tipo: Journal paper |
Palavras-chave: Crop husbandry. |
| Ano: 2003 |
URL: http://orgprints.org/16832/1/virkaj%C3%A4rvi2.pdf |
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| Sairanen, Auvo; Khalili, Hannele; Virkajärvi, Perttu; Hakosalo, Jenni. |
| Cows were assigned randomly to indoor silage feeding (with 2 h outdoor exercise) or part-time grazing treatment in two different experiments. One group was kept in confinement with ad libitum grass silage within each experiment. The other group had ad libitum grass silage indoors and they were put out on grass pasture during part of the 24 hour period, 12 hours (night, Experiment 1) and 6 hours (day, Experiment 2) in June, July and August. In Experiment 2, the concentrate (9 kg d-1) was given at two crude protein levels: high crude protein [185 g kg-1 dry matter (DM)] and low crude protein (135 g kg-1 DM). In Experiment 1, night-time grazing increased total DM intake and milk (3.9 kg d-1) production. There was interaction between month and forage feeding... |
| Tipo: Journal paper |
Palavras-chave: Feeding and growth. |
| Ano: 2006 |
URL: http://orgprints.org/17089/1/sairanen.pdf |
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