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The experiment was conducted to evaluate the bromatological characteristics and the in vitro digestibility of four sugarcane varieties, subjected or not to hydrolysis, with quicklime. A completely randomized design was employed with three replications arranged in a 4 × 2 factorial scheme, with four sugarcane varieties (SP 52454, RB 867515, RB 855536 and IAC 862480), hydrolyzed or not. There was significant effect on brix (p < 0.05) and industrial fiber (p < 0.05), and IAC 862480 variety had the lowest levels of industrial fiber. There were no significant difference (p > 0.05) in neutral detergent fiber, acid detergent fiber and lignin levels among the sugarcane varieties under analysis and for the sugarcanes, hydrolyzed or not. The use of sugarcane hydrolysis with 1% quicklime improves the in vitro digestibility of NDF and ADF, regardless of the variety studied. Hydrolysis with 1% quicklime did not alter the sugarcane chemical composition.

The objective of this study was to evaluate the performance, consumption and feed conversion of Angus x Nellore heifers fed hydrolyzed sugarcane. Twenty-four (1/2 Angus x Nellore crossbred) heifers were used with average body weight of 242 kg ± 23 kg, confined in individual pens with total area of 15 m2. The study consisted of six treatments distributed as follows: T1 – in natura sugarcane: sugarcane was given to animals after being chopped; T2 – hydrolyzed sugarcane with 0.5 % lime and 24 hours of air exposure; T3 – hydrolyzed sugarcane with 0.5 % lime and 48 hours of air exposure; T4 – hydrolyzed sugarcane with 1.0 % lime and 24 hours of air exposure; T5 – hydrolyzed sugarcane with 1.0 % lime and 48 hours of air exposure; T6 – hydrolyzed sugarcane with 1.0 % lime and 72 hours of air exposure. We used a completely randomized design with four replicates per treatment, and averages were compared by Tukey test at 5 % significant level of probability. No statistical difference was found for any of the treatments (P>0.05). The processing of sugarcane with lime did not increase the intake and performance of animals evaluated in this study.

The experiment was conducted to evaluate the bromatological characteristics and the in vitro digestibility of four sugarcane varieties, subjected or not to hydrolysis, with quicklime. A completely randomized design was employed with three replications arranged in a 4 × 2 factorial scheme, with four sugarcane varieties (SP 52454, RB 867515, RB 855536 and IAC 862480), hydrolyzed or not. There was significant effect on brix (p < 0.05) and industrial fiber (p < 0.05), and IAC 862480 variety had the lowest levels of industrial fiber. There were no significant difference (p > 0.05) in neutral detergent fiber, acid detergent fiber and lignin levels among the sugarcane varieties under analysis and for the sugarcanes, hydrolyzed or not. The use of sugarcane hydrolysis with 1% quicklime improves the in vitro digestibility of NDF and ADF, regardless of the variety studied. Hydrolysis with 1% quicklime did not alter the sugarcane chemical composition.

Objetivou-se com este estudo avaliar o desempenho, o consumo e a conversão alimentar de novilhas Angus x Nelore alimentadas com cana-de-açúcar hidrolisada. Foram utilizadas 24 novilhas (1/2 sangue Angus x Nelore) com peso corporal médio de 242 kg ± 23 kg, confinadas em baias individuais com área total de 15 m2. O trabalho foi composto por seis tratamentos distribuídos da seguinte forma: T1 – cana in natura: a cana-de-açúcar era fornecida aos animais após picada; T2 – cana hidrolisada com 0,5% cal virgem e 24 horas de exposição ao ar; T3 – cana hidrolisada com 0,5% cal virgem e 48 horas de exposição ao ar; T4 – cana hidrolisada com 1,0% cal virgem e 24 horas de exposição ao ar; T5 – cana hidrolisada com 1,0% cal virgem e 48 horas de exposição ao ar; T6 – cana hidrolisada com 1,0% cal virgem e 72 horas de exposição ao ar. Utilizou-se o delineamento inteiramente casualizado com quatro repetições por tratamento, sendo as médias comparadas pelo teste de Tukey a 5 % de significância de probabilidade. Não foram verificadas diferenças estatísticas em nenhum dos tratamentos (P>0,05). O tratamento da cana-de-açúcar com cal virgem não aumentou o consumo nem o desempenho dos animais avaliados neste trabalho. PALAVRAS-CHAVE: hidrólise; nutrição de ruminantes; óxido de cálcio; tratamento alcalino.