Silagem de cana-de-açúcar tratada com aditivo químico ou microbiano na alimentação de cabras em início de lactação / Sugar cane silage treated with microbial or chemical additives fed to goats in early lactation

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Sugar cane is an important roughage source for ruminants. Sugar cane silage is an alternative feed which may improve operation efficiency at farm level. However, high levels of ethanol found in sugar cane ensiled without additive may reduce voluntary feed intake and may affect animal performance. Two experiments were performed to evaluate the effects of using fresh sugar cane and sugar cane silage treated with microbial (Lactobacillus buchneri) or chemical (urea) additives on lactation performance of goats and diets digestibility in ram lambs. Trial 1: Thirty-six lactating Saanen does (15±3 DIM) were used to evaluate the effects of feeding sugar cane silage treated with microbial or chemical additives on dry matter intake, blood parameters, ingestive behavior and milk yield and milk composition. Goats were assigned to a complete randomized block design (according to milk production, DIM and number of lactation) and housed individually in a tie stall during 12 weeks. Trial 2: Twelve Santa Inês ram lambs were placed in metabolic crates to evaluate diet digestibility. Experimental diets were composed by 50:50 (concentrate: roughage ratio) TMR. Experimental treatments were the roughage source: fresh sugar cane (FSC), sugar cane silage with L. buchneri (SCS + Lb), 5x104 cfu/g wet basis, sugar cane silage with 1% urea wet basis (SCS1%) or sugar cane silage with 1.5% urea wet basis (SCS1.5%). Dry matter intake, body weight variation, milk yield and composition were similar (P>0.05) among treatments (FSC vs SCS + Lb and SCS1% vs SCS1.5%). Treatment FSC compared to SCS+Lb showed higher (P<0.05) blood glucose concentration (BG), plasma urea nitrogen (PUN), time spent eating and chewing in 24 hours, time spent ruminating and chewing at initial 6 hours. Milk urea nitrogen was higher (P<0.05) for SCS1% compared to SCS1.5%. Silages added with urea showed higher (P<0.05) milk fat, milk total solids, milk urea, and lower (P<0.05) BG and PUN when compared to the FSC treatment. NDF digestibility was lower (P<0.05) for SCS compared to sugar cane silages (FSC vs SCS + Lb; FSC vs SCS1% and SCS1.5%). CP digestibility was higher (P<0.05) for animals fed SCS1.0% compared those fed SCS1.5%. There were no differences (P>0.05) on nitrogen balance in all comparison evaluated. Microbial inoculants had no detrimental effect, showing similar results for milk production and composition. The use of additives in sugar cane silage improves NDF digestibility.

ASSUNTO(S)

lactobacillus desempenho animal lactação animal urea alimentação animal performance cabras digestibilidade uréia digestibility cana-de-açúcar lactobacillus buchneri silagem

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