Nutrient Losses in Relation to Film Colour and Number of Layers
Per Lingvall
Swedish University of Agricultural Sciences (SLU), Department of Animal Nutrition and Management, Kungsängen Research Centre, SE – 753 23 Uppsala. Email: Per.Lingvall@huv.slu.se
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The research compared black and white Triowrap 25 μ m film made with DOWLEX 2045S PE™ Resins, 70% prestretched, 750 mm wide and 50% overlap; without and with 4-layer Kofasil Ultra per ton forage.
The data below shows nutrient losses (water soluble carbohydrates) kg per ton silage DM
|
Experiment 1 |
Experiment 2 |
|
460g Dm per kg FW |
610g DM per kg FW |
| Control |
+Kofasil |
Control |
+Kofasil |
| Black x 6 layers |
90 |
65 |
|
|
| White x 4 layers |
|
|
63 |
38 |
| White x 6 layers |
58 |
41 |
39 |
21 |
| White x 8 layers |
|
|
38 |
23 |
Least Significant Differences
(p<0.05) |
|
5.2 |
|
3.5 |
The results of the research showed that:
- White film increased the silage value by 9 Euro per ton DM, equivalent to 3 Euro per bale, in comparison with black film.
- Six layers of white film, compared with four, increased the silage value by 7 Euro per ton DM, equivalent to 2.3 Euro per bale.
- Six layers of white film gave satisfactory gas tightness but eight layers would be an economic investment in difficult conditions — 5% higher losses in nutrient value with six layers corresponds to 2.3 Euro per bale.
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