Ingestive behavior of Nellore steers in feedlot fed with diets containing different corn hybrids
Yurika Mizubuti, IvoneBonini Sestari, BrunaLuis Azambuja Ribeiro, EdsonSales Pereira, ElzâniaAurélio Alves Freitas Barbosa, MarcoPricila Pires do Prado, OdimáriEvans Cunha, Gianneda Costa Gomes, RodrigoCamilaCamilaCamilaCamila
The objective of this work was to study the feeding behavior of Nellore beef cattle in feedlot fed with diets containing different corn hybrids. Twenty-seven animals averaging 350 ± 24 kg of body weight and 24 months of age, were used. The animals were distributed in a completely randomized design with three treatments (T), where, T1-TDFC: total diet containing flint corn, T2-TDSFC: total diet containing semi-flint corn and T3-TDSDC: total diet containing semi-dent corn, with 9 replicates per treatment. The animals were fed ad libitum twice a day (at 8:00am and 4:00pm) with a isocaloric and isonitrogenous diet, with 30% of sugar cane bagasse and 70% concentrate (88% maize, 8% soybean meal, 3% mineral and vitamin supplement and 1% urea) for 95 days (14 days of adaptation and 3 experimental periods of 27 days each). The animals were weighed at the beginning of the experiment and after each period of 27 days, always in a fasting period of 16 hours. The evaluation of animals feeding behavior occurred at the last day of each period by visual observation every five minutes for full periods of 24 hours. Observations were made in four shifts: morning (06:00 to 12:00), afternoon (12:00 to 18:00), evening (18:00 to 00:00) and early morning (00:00 06:00) to determine the number of ruminal bolus, chewing time, total feeding time, total ruminating standing time, total ruminating lying time,
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