<abstract xmlns="http://www.w3.org/1999/xhtml"><p>This experiment compared silages obtained from 3 hybrids of sorghum grown on 2 farms of the Po Valley (one irrigated and one not), in terms of <italic>in vitro</italic> degradability, gas production (GP), and energy value. Hybrids (forage, sweet or grain genotypes) were sown in experimental plots (3 plots × 3 hybrids), harvested at late-milk stage of maturity, and ensiled into mini-silos (3 silos × 3 hybrids) for 60 d. After ensiling, silages were analyzed for composition and fermentation profile. Two incubations (at 48 h) were carried out to measure NDF degradability (NDFd), GP, and the metabolizable energy (ME) content of silages. Data of silage composition were submitted to ANOVA, considering farm (F), hybrid (H), and F × H interaction as variation sources. Incubation (run) was also considered as a fixed effect in the statistical model for the parameters obtained by <italic>in vitro</italic> incubation (NDFd, GP, and energy content). On the irrigated farm (Farm 2), the DM contents of silages were higher than those of the non-irrigated one (P&lt;0.001) and the fermentation profile was more favorable. Values of GP at 24 and 48 h and ME content were higher (P&lt;0.05) for silages of Farm 2 in comparison with Farm 1. Within hybrids, the grain sorghum revealed the greatest DM content whereas the forage sorghum, as expected, was the richest in fibrous fraction content, followed by the sweet and grain genotypes (P&lt;0.001). Consequently, values of GP were significantly (P&lt;0.01) influenced by hybrid (167, 200, 215 ml/g DM and 229, 257, 267 ml/g DM for forage, sweet and grain genotypes after 24 and 48 h of incubation, respectively). The F × H interaction was significant for all considered parameters excluding DM, lignin, ash, pH, and <italic>in vitro</italic> parameters. On the two farms, in general, forage and grain genotypes were largely different, whereas the sweet sorghum was quite similar to the forage in one case or grain in the other. Results of this experiment highlight the large variability of the nutritional values of sorghum hybrids grown in different conditions.</p></abstract>

This experiment compared silages obtained from 3 hybrids of sorghum grown on 2 farms of the Po Valley (one irrigated and one not), in terms of in vitro degradability, gas production (GP), and energy value. Hybrids (forage, sweet or grain genotypes) were sown in experimental plots (3 plots × 3 hybrids), harvested at late-milk stage of maturity, and ensiled into mini-silos (3 silos × 3 hybrids) for 60 d. After ensiling, silages were analyzed for composition and fermentation profile. Two incubations (at 48 h) were carried out to measure NDF degradability (NDFd), GP, and the metabolizable energy (ME) content of silages. Data of silage composition were submitted to ANOVA, considering farm (F), hybrid (H), and F × H interaction as variation sources. Incubation (run) was also considered as a fixed effect in the statistical model for the parameters obtained by in vitro incubation (NDFd, GP, and energy content). On the irrigated farm (Farm 2), the DM contents of silages were higher than those of the non-irrigated one (P<0.001) and the fermentation profile was more favorable. Values of GP at 24 and 48 h and ME content were higher (P<0.05) for silages of Farm 2 in comparison with Farm 1. Within hybrids, the grain sorghum revealed the greatest DM content whereas the forage sorghum, as expected, was the richest in fibrous fraction content, followed by the sweet and grain genotypes (P<0.001). Consequently, values of GP were significantly (P<0.01) influenced by hybrid (167, 200, 215 ml/g DM and 229, 257, 267 ml/g DM for forage, sweet and grain genotypes after 24 and 48 h of incubation, respectively). The F × H interaction was significant for all considered parameters excluding DM, lignin, ash, pH, and in vitro parameters. On the two farms, in general, forage and grain genotypes were largely different, whereas the sweet sorghum was quite similar to the forage in one case or grain in the other. Results of this experiment highlight the large variability of the nutritional values of sorghum hybrids grown in different conditions.

<italic>In vitro</italic> Degradability, Gas Production, and Energy Value of Different Hybrids of Sorghum after Storage in Mini-Silos

Department of Comparative Biomedicine and Food Science, University of Padova, Viale dell’Università 16, 35020 Legnaro (Padova), Italy

Veneto Agricoltura Agency, Viale dell’Università 14, 35020 Legnaro (Padova), Italy

Annals of Animal Science

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

 Degradability, Gas Production, and Energy Value of Different Hybrids of Sorghum after Storage in Mini-Silos

This experiment compared silages obtained from 3 hybrids of sorghum grown on 2 farms of the Po Valley (one irrigated and one not), in terms of in vitro...

In vitro Degradability, Gas Production, and Energy Value of Different Hybrids of Sorghum after Storage in Mini-Silos

Published Online: Aug 02, 2016

Page range: 769 - 777

Received: Jul 30, 2015

Accepted: Nov 24, 2015

DOI: https://doi.org/10.1515/aoas-2015-0082

Keywords
sorghum hybrids, sorghum silage, degradability, gas production

© 2016 Mirko Cattani et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

In vitro Degradability, Gas Production, and Energy Value of Different Hybrids of Sorghum after Storage in Mini-Silos

Published Online: Aug 02, 2016

Page range: 769 - 777

Received: Jul 30, 2015

Accepted: Nov 24, 2015

DOI: https://doi.org/10.1515/aoas-2015-0082

Keywordssorghum hybrids, sorghum silage, degradability, gas production

© 2016 Mirko Cattani et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
sorghum hybrids, sorghum silage, degradability, gas production