Federal Institute of Education, Science and Technology of Piaui, Oeiras, PÌ, Brazil.
State University of the Southwest of Bahia, Itapetinga, BA, Brazil.
Trop Anim Health Prod. 2022 Jun 9;54(4):205. doi: 10.1007/s11250-022-03192-w.
In this study, we evaluated the feeding behavior of Girolando steers on Brachiaria brizantha cultivar Marandu pastures. Twenty-two animals with an average initial weight of 209.09 ± 8.18 kg were distributed in a completely randomized design in a 3 × 2 factorial arrangement (three seasons and two nutritional plans (NP)) with 11 replicates, as follows: rainy season 1 (NP1, mineral mixture ad libitum, and NP2, nitrogen/energy supplement [2 g.kg body weight [BW]]); dry season (NP1, nitrogen/energy supplement [1 g.kg BW], and NP2, nitrogen/energy supplement [2 g.kg BW]); and rainy season 2 (NP1, mineral mixture ad libitum, and NP2, nitrogen/energy supplement ([1 g.kg BW]). Total chewing time was longer in NP1 (566.44 vs 528.33 min.day in NP2) (p < 0.05). The grazing, idle, trough, and total chewing times were affected by the interaction between nutritional plans and seasons. The period expended grazing was longer for the NP1. The idle time was affected by the nutritional plans and was lower for the NP1. Feeding at the trough was not affected by the nutritional plans. The animals of the NP2 showed the highest feed efficiencies in DM and NDF (0.91 and 0.52 vs 0.75 and 0.45 in NP1, respectively). Rainy season 2 had the highest efficiencies. The feeding behavior changes according to the supplementation level. Nutritional plan 2 in the second rainy season presented the best results.
本研究评估了 Girolando 阉牛在 Marandu 型杂交臂形草牧场上的采食行为。22 头平均初始体重为 209.09 ± 8.18 kg 的动物采用完全随机设计，在 3×2 因子设计（三个季节和两个营养方案（NP））中进行分组，每个方案有 11 个重复，具体分组如下：雨季 1（NP1，自由采食矿物质混合物，NP2，氮/能量补充剂[2 g.kg BW]）；旱季（NP1，氮/能量补充剂[1 g.kg BW]，NP2，氮/能量补充剂[2 g.kg BW]）；雨季 2（NP1，自由采食矿物质混合物，NP2，氮/能量补充剂[1 g.kg BW]）。NP1 的总咀嚼时间较长（566.44 分钟/天 vs NP2 的 528.33 分钟/天）（p<0.05）。NP1 与 NP2 的采食、静止、反刍和总咀嚼时间受营养方案和季节的交互作用影响。NP1 的采食时间较长。静止时间受营养方案的影响，NP1 的静止时间较短。动物在食槽中的进食时间不受营养方案的影响。NP2 的 DM 和 NDF 饲料效率最高（0.91 和 0.52 分别与 NP1 的 0.75 和 0.45 相比）。雨季 2 的效率最高。采食行为根据补充水平而变化。第二个雨季的营养方案 2 效果最好。
