Performance, nitrogen balance and microbial efficiency of beef cattle under concentrate supplementation strategies in intensive management of a tropical pasture

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• 作者：Tiago Cunha Rocha…
• 关键词：Cassava root ; Digestibility ; Intake ; Panicum maximum ; Feed supplementation
• 刊名：Tropical Animal Health and Production
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：48
• 期：3
• 页码：673-681
• 全文大小：309 KB
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• 作者单位：Tiago Cunha Rocha (1)
  Carlos Augusto de Alencar Fontes (2)
  Renata Tavares Soares da Silva (2)
  Elizabeth Fonsêca Processi (2)
  Felipe Roberto Amaral Ferreira do Valle (2)
  Cláudio Teixeira Lombardi (2)
  Ronaldo Lopes Oliveira (1)
  Leilson Rocha Bezerra (1) (3)
  
  1. School of Veterinary Medicine and Animal Science, Federal University of Bahia, Salvador, Bahia State, Brazil
  2. Department of Animal Science, State University of North Fluminense Darcy Ribeiro, Campos dos Goytacazes City, Rio de Janeiro State, Brazil
  3. Department of Animal Science, Federal University of Piauí, BR 135, Km 03, Bairro Planalto Horizonte, Bom Jesus, Piauí State, Brazil
  
• 刊物类别：Medicine
• 刊物主题：Medicine & Public Health
  Veterinary medicine
  Zoology
  
• 出版者：Springer Netherlands
• ISSN：1573-7438

文摘

The objective of this study was to evaluate the effect of concentrate supplementation strategies on the nutritional characteristics of beef cattle in intensive management of tropical pasture. Twenty-four Nellore steer at 250 kg body weight (BW) were used, divided into two plots, with 12 animals in each plot. The experimental area consisted of 32 paddocks with 0.25 ha of Panicum maximum cv. Mombaça. The experiment consisted of 96-day experimental periods, with three periods of 32 days. The strategies studied were P = exclusively on pasture and without concentrate supplementation (control), ES = pasture and supplemented with a concentrate low in protein, PS = pasture and supplemented with high protein content, and PES = pasture and supplementation with balanced protein-energy. There was reduced intake of DM in animals of the treatment P in relation to supplemented pasture, regardless of supplementation. Animals fed on ES showed an intake of more nutrients than the animals on PS. The CP and TDN were also lower in P than in pastures where animals received the additional types of concentrate, and the PS animals showed greater digestibility of CP and TDN than the ES animals. However, the animals exhibited similar weight gains. Animals on P ingested smaller amounts of N and had lower fecal excretion compared to the supplemented animals, but there was no difference between treatments in nitrogen balance. Urea nitrogen and urea from the blood were higher in the supplemented animals than in animals fed on pasture; these levels were also higher in PS animals compared to animals receiving ES. Both the purines absorbed and microbial protein production were similar between treatments. However, the animals fed with concentrate supplementation, independent of the strategy involved, showed higher microbial efficiency compared to animals fed exclusively on pasture.