Current experiment evaluated the effect of replacement of full corn meal by dehydrated ground cassava roots at levels 0, 25, 50, 75 and 100% in experimental supplements for lactating cows grazing on irrigated and fertilized tropical pastures. Ten Holstein cows were divided into two 5 x 5 Latin squares, with average initial 150 days of lactation, milk production 22±3.30 kg day-1 at the beginning of experiment and initial body weight of 603±65 kg. Cows were maintained on pasture consisting of elephant grass (Pennisetum purpureum, Schum) cultivar Pioneiro, intercropped with Tifton 85 (Cynodon nlemfuensis), fertilized with 600 kg nitrogen per hectare year-1. There was no significant difference (p > 0.05) between the substitution levels of corn meal by ground and dehydrated cassava root in the concentrate on the synthesis of microbial protein with an estimated average of 1,288.49 g day-1 and efficiency in the synthesis of microbial protein per kilogram of TDN with estimated average of 91.30 g kg-1 TDN. Nitrogen equilibrium showed an estimated average of 218.79 g day-1 of retained nitrogen. The microbial protein synthesis and nitrogen balance were not affected by treatments.
ResumoO experimento foi realizado para avaliar o efeito da substituição do milho moído por raiz integral de mandioca moída e desidratada nos níveis 0%, 25%, 50%, 75% e 100% nos suplementos experimentais para vacas lactantes mantidas em pastagens tropicais irrigadas e adubadas. Foram utilizadas 10 vacas da raça Holandesa, divididas em dois quadrados latinos 5x5, com média inicial de 150 dias de lactação, produção leiteira inicial de lactação de 22 kg/dia e peso corporal inicial médio de 603 kg, mantidos em pastagem formada por capim elefante (Pennisetum purpureum, SCHUM) cultivar pioneiro, consorciado com capim Tifton 85 (Cynodon nlemfuensis), irrigadas e adubadas com 600 kg de nitrogênio por hectare/ ano. Não foram encontrados efeitos significativos de substituição do milho moído por raiz integral de mandioca moída e seca no concentrado (P>0,05), sobre o consumo voluntário da dieta total, com média estimada de 20,61 kg/MS/animal/dia, digestibilidade aparente da MS com média estimada de 59,60% e balanço de energia, com média estimada de +6,36 Mcal dia -1 . Os resultados deste estudo demonstram que a raiz de mandioca pode ser utilizada como fonte energética de alto valor nutricional, semelhante ao do milho, na suplementação de vacas lactantes mantidas em pastagens tropicais. Palavras-chave: Carboidratos, forrageiras, ingestão, nutrição AbstractThe development of this experiment intended to evaluate the effect of replacing ground corn for dried and ground cassava roots with the levels of 0%, 25%, 50%, 75% and 100% in the experimental supplements for lactating cows kept on tropical irrigated and fertilized pastures. Ten Holstein cows were divided into two 5x5 Latin squares, with an initial lactation average of 150 days, 22 kg/day of average milk production of lactation and approximate initial average body eight of 603 kg. The animals were kept in pasture constituted by elephant grass (Pennisetum purpureum, SCHUM) cv Pioneer, associated with Tifton 85 grass (Cynodon nlemfuensis), irrigated and fertilized with 600 kg of nitrogen per hectare/ year. No significant effects on the substitution of ground corn for dried and ground cassava roots in the concentrate (P>0.05) over the spontaneous consumption of the total diet, with estimated average of 20.61 kg/DM/animal/day, apparent digestibility of DM with estimated average of 59.60% and energy balance with estimated average of +6.36 Mcal day -1 . The results of this study demonstrate that the cassava root can be used as an energy source of high nutritional value for supplementation of lactating cows grazing on tropical pastures, similar to corn results.
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