Elephantgrass wilted or with cocoa meal in silage production / Capim-elefante emurchecido ou com farelo de cacau na produção de silagem

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

Three experiments ware conducted to evaluate the silage quality of elephantgrass harvested at 50 days after cuttin and submitted to wilting on sun for eight hours or to the addition of 0, 7, 14, 21 and 28% (natural base) of cocoa meal (CM). It were used PVC silos with 5.3 liters capacity, which were opened 45 days after ensilage process. In experiment I, the CM added to elephantgrass was efficient to increase the silage DM content. The addition of 7% of CM showed a DM content similar (P>.05) that found for wilted elephantgrass. Total nitrogen, ether extract, lignin, neutral detergent insoluble nitrogen and acid detergent insoluble nitrogen contents were lighter with CM in silages than silages obtained with wilted elephantgrass. The addiction of CM caused reduction in neutral detergent fiber, acid detergent fiber, cellulose, hemicellulose, ashes, total digestives nutrients (TDN), and in vitro dry matter digestibility (IVDMD). The estimated TDN to wilted treatment was greater than the other treatments with or without CM. Although the CM had provided reduction in the IVDMD, the 7 and 14% levels of inclusion resulted in highest digestibility of the silages (over 60%). Linear increase for pH and linear reduction for soluble carbohydrates on silages were observed as a result of the addition of CM (P<.05). The ammoniacal nitrogen content increased linearly; however, no statistical difference was observed in organic acids contents of silages with CM when compared to silages obtained from wilted treatment. There was a linear increase of lactic acid with the addition of CM. The wilted treatment and CM can be used as alternatives to increase DM content of silages. In the experiment II, were studied the fractions that constitute the total carbohydrates (CHO) and crude protein (CP). The wilted treatment showed CHO content similar to treatments with 14 and 21% CM. The regression analysis detected linear reduction of this fraction to treatments with addition of CM. The silages CHO fractions were influenced by CM additions, observing highest contents of A+B1 and NDFi and smallest. To all carbohydrate and protein estimated fractions, the wilted treatment showed similar values (P>.05) to the treatment without wilting. The protein fractions were influenced by CM additions, verifying reduction in contents of A and B1+B2 fractions and increasing in B3 and C fractions. In the experiment III, the DM, CP and NDF rumen degradation kinetic parameters were evaluated. To DM, the CM inclusion reduced the degradation potential, which showed highest values to wilted and no wilted treatments. The CP and NDF potential degradability suffered small variations, with mean values near 80 and 46%, respectively. Considering the 5%/h passage rate, all the treatments showed high CP effective degradability (over 55%). Although the rumen degradation estimative silages with CM showed a reduction tendency, all silages showed potential degradability to DM and CP over 65 and 75%, respectively.

ASSUNTO(S)

matéria seca nutrição animal silage farelo de cacau matter dried cocoa meal pastagem e forragicultura elephantgrass capim-elefante silagem

ACESSO AO ARTIGO

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