Naves Karine R S, Moraes Kamila A K, Cunha Lorrayne O da, Petrenko Natasha B, Ortelam Juliana C, Sousa Jarliane N, Covatti Caroline F, Nunes Dener, Chaves Carla S, Menezes Flávio L de, Oliveira André S de, Moraes Eduardo H B K
Núcleo de Estudos em Pecuária Intensiva-NEPI, Universidade Federal de Mato Grosso, Campus Universitário de Sinop, Sinop 78557-267, Brazil.
Department of Animal Science, Colorado State University, Fort Collins, CO 80521, USA.
Animals (Basel). 2024 Dec 20;14(24):3688. doi: 10.3390/ani14243688.
Pasture-based beef cattle production systems aim to maximize the interaction between forage and supplements to increase activity. In addition, supplementation and the use of food additives help optimize production efficiency and improve the use of additional nutrients. The aim of this study was to evaluate the effects of the use of additives in protein-energy supplements (PESs) on the intake, digestibility, and ruminal parameters of beef cattle raised on pasture in the rearing phase. Five male cattle were allocated to a 5 × 5 Latin square design, with five experimental periods and five treatments. The animals were kept under continuous grazing in individual paddocks of marandu palisadegrass ( cv. Marandu). The treatments consisted of a mineral mixture (MM) (0.080 kg/animal/day), PES (4.0 kg/animal/day), PES with monensin sodium (120 mg/animal/day), PES with functional oil (2500 mg/animal/day) and PES with active yeast (4000 mg/animal/day). PESs increased the total dry matter intake (DMI) (kg/day) and the DMI in terms of % body weight (%BW) and increased the intake of crude protein (CP) and the dry matter intake of digestible organic matter (DOM). The use of additives did not affect nutrient intake or digestibility. Compared with MM, the PES increased the concentrations of ruminal ammonia nitrogen and serum urea nitrogen. In addition, there was an increase in fecal nitrogen, retained nitrogen, microbial nitrogen synthesis and microbial efficiency. The use of monensin sodium, functional oil and active yeast in protein-energy supplements for beef cattle in pastures did not affect the nutritional parameters under the conditions observed in this study.
基于牧场的肉牛生产系统旨在使草料与补充饲料之间的相互作用最大化，以增加活动量。此外，补充饲料和食品添加剂的使用有助于优化生产效率，并提高额外营养物质的利用率。本研究的目的是评估在育肥阶段使用添加剂对牧场饲养的肉牛蛋白质-能量补充料（PES）的摄入量、消化率和瘤胃参数的影响。将五头雄性牛分配到5×5拉丁方设计中，有五个试验期和五种处理。动物在马兰杜栅状草（品种：马兰杜）的单独围场中持续放牧。处理包括矿物质混合物（MM）（0.080千克/头/天）、PES（4.0千克/头/天）、含莫能菌素钠的PES（120毫克/头/天）、含功能油的PES（2500毫克/头/天）和含活性酵母的PES（4000毫克/头/天）。PES增加了总干物质摄入量（DMI）（千克/天）以及以体重百分比（%BW）表示的DMI，并增加了粗蛋白（CP）摄入量和可消化有机物（DOM）的干物质摄入量。添加剂的使用不影响营养物质的摄入量或消化率。与MM相比，PES增加了瘤胃氨氮和血清尿素氮的浓度。此外，粪便氮、留存氮、微生物氮合成和微生物效率均有所增加。在本研究观察到的条件下，在牧场肉牛的蛋白质-能量补充料中使用莫能菌素钠、功能油和活性酵母不影响营养参数。
