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| Author(s): |
Lucas Felipe Francisco
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Piracicaba. |
| Institution: | Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz (ESALA/BC) |
| Defense date: | 2021-09-24 |
| Examining board members: |
Luiz Gustavo Nussio;
Evandro Maia Ferreira;
Greiciele de Morais
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| Advisor: | Luiz Gustavo Nussio |
| Abstract | |
The present trial aimed to evaluate the characteristics of four polyethylene films and a film overlay strategy and its effects on nutritional quality, physicochemical and aerobic stability of corn silage and, as a consequence, the effects on performance and on finishing lambs. Five treatments were designed as follows: linear polyethylene butene 120µm (PLB120); octene 120µm linear polyethylene (PLO120); linear polyethylene octene 100 µm (PLO100); octene 80µm linear polyethylene (PLO80); 120µm linear butene polyethylene + 50µm octene linear polyethylene (PLB120+PLO50). Four surface-type silos were made, each containing the 5 treatments distributed along its length. The storage period was 180 days and after opening, the silage was offered to finishing lambs for evaluation of animal performance. The forage was analyzed before and after fermentation, through chemical analysis (DM, MM, CP, NDF, ADF, OM), pH determination, temperature measurements and fermentation products, dry matter losses and aerobic stability. Data were studied using contrasts, evaluating the effects of Thickness (PLO80 and PLO100 vs PLO120), Material (PLO120 vs PLB120) and Additional Film (PLB120 vs PLB120+PLO50). The thickness of the films was decisive for the surface and panel temperature profile, and the PLO120 resulted in lower film temperatures, lower losses (6.3 percentage points less DM loss) and greater aerobic stability (average increase 26 hours) than the thinner PLO80 and PLO100. The Materials (octene and butene) were similar in terms of DM loss (mean 11%), but aerobic stability was significantly higher for PLO120 (mean increase of 32 hours) than PLB120. The film combination strategy did not differ on the temperature profile, but under conditions after opening it was efficient in reducing the temperature of the outermost superficial layer of the silo. The performance of the animals was similar, however, there were trends on the effect of an additional film, which can be explained by the divergence of nutritional composition of the silages in the diets. (AU) | |
| FAPESP's process: | 19/11614-6 - Films kinetics over time of storage and influence on the chemical-fermentative characteristics of corn silage |
| Grantee: | Lucas Felipe Francisco |
| Support Opportunities: | Scholarships in Brazil - Master |