The objective of this study was to characterize and identify the protein fractions of two cultivars of pearl millet (Pennisetum glaucum) – ADR-300 and cv. BN-1 – submitted to different nitrogen doses (0, 50, 100 and 150 kg.ha-1) at three cutting ages. The experimental design used was randomized blocks with a 4 x 3 factorial treatment structure, with three repetitions. The crude protein concentration (CP) and the protein fractions A, B1, B2, B3 and C of the pearl millet cultivars were evaluated by the Cornell Net Carbohydrate and Protein System. The CP concentrations differed according to the cultivars, with variation between the treatments of 14.01% to 23.29% for ADR-300 and 11.82% to 19.29% for BN-1. Fraction A (P<0.05) differed for the two cultivars, with variations also observed in the B1, B2 and B3 fractions in function of the treatments applied. Fraction C (P<0.05) differed among treatments only on the first cutting, for all doses for the two cultivars evaluated. The nitrogen doses and cutting age influenced the composition of the protein fractions.

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RESUMO. Avaliou-se o comportamento ingestivo de borregos e borregas da raça Santa Inês alimentados com duas diferentes cultivares de cana-de-açúcar in natura (IAC 86-2480 e SP 80-0155). Foram utilizados 28 animais, alojados em baias individuais e distribuídos em delineamento inteiramente casualizado. Utilizaram-se quatro tratamentos sendo dois lotes com sete borregos e dois lotes com sete borregas recebendo uma das cultivares de cana-de-açúcar in natura como volumoso. O experimento teve duração de 70 dias, sendo 10 dias de adaptação e 60 dias para coleta de dados. As avaliações foram realizadas a cada 5 minutos durante 24 horas, em intervalos de 15 dias, totalizando quatro avaliações ao longo do experimento. Não houve diferença estatística para ingestão, ruminação e ócio em minutos/dia. O uso das diferentes cultivares de cana-de-açúcar (IAC 86-2480 e SP 80-0155) in natura como fonte de volumoso não interferiu nas atividades diárias de ingestão, ruminação e ócio. Palavras chave: Ovis aries, eficiência de alimentação, confinamento, ovinoculturaFeeding behavior of fed lambs and ewe lambs with two cultivars of sugarcane ABSTRACT. We evaluated the feeding behavior of lambs and ewe lambs Santa Inês fed two different cultivars of sugarcane in natura (IAC 86-2480 and SP 80-0155). 28 animals were distributed in a completely randomized design, housed in individual stalls. We used four treatments and two lots with seven lambs and two lots with seven ewe lambs receiving one of the varieties of sugarcane in natura as roughage. The experiment lasted 70 days, 10 days of adaptation and 60 days for data collection. The evaluations were performed every 5 minutes for 24 hours at intervals of 15 days, a total of four evaluations during the experiment. No significant difference to eating, ruminating and idle in minutes/day. The use of different cultivars of sugarcane (IAC 86-2480 and SP 80-0155) in natura as roughage source did not interfere in the daily intake activities, rumination and idleness.