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Nutritional planning for Nellore heifers post-weaning to conception at 15 months of age: performance and nutritional, metabolic, and reproductive responses

  • Daniel Mageste de Almeida
  • Marcos Inácio Marcondes
  • Luciana Navajas Rennó
  • Luiz Henrique Pereira Silva
  • Leandro Soares Martins
  • David Esteban Contreras Marquez
  • Faider Alberto Castaño Villadiego
  • Felipe Velez Saldarriaga
  • Julian David Castaño Franco
  • Deilen Paff Sotelo Moreno
  • Felipe Henrique de Moura
  • Mário Fonseca Paulino
Regular Articles

Abstract

The objective of this study was to evaluate the effects of strategic supplementation in the dry period and dry/rainy transition period on the performance and nutritional, metabolic, and reproductive responses of Nellore heifers grazing Urochloa decumbens. Forty-eight Nellore heifers with age and body weight (BW) of eight months and 235 ± 3.3 kg, respectively, were used. The experimental design was a completely randomized design, with four treatments, all with 12 replications. The evaluated strategies were as follows: low supplementation (LOHI; 0.2% of BW/heifer/day) in the first 90 days and high supplementation (0.6% of BW/heifer/day) in the 90 days thereafter; average supplementation (AVER) with 0.4% of BW/heifer/day for 180 days; high supplementation (HILO; 0.6% of BW/heifer/day) in the first 90 days and low supplementation (0.2% of BW/heifer/day) in the 90 days thereafter; only mineral mix (MM) ad libitum during the 180 days. Data were evaluated using orthogonal contrasts. Supplementation improved the performance of the animals during of dry period (P < 0.05) and dry/rainy transition period (P < 0.05). Supplemented animals had higher longissimus muscle area (LMA) and subcutaneous fat thickness (SFT) at the end of the experiment (P < 0.05). Multiple supplementation increased intake of dry matter (DM), organic matter (OM), and crude protein (CP) in kg/day throughout the experiment. The supplementation increased the digestibility of DM, OM, CP, apNDF, and TDN (P < 0.05). Serum urea nitrogen (SUN), glucose (GLUC), insulin (INS), and progesterone (PROG) were higher in supplemented heifers (P < 0.05). Supplementation reduced the concentrations of non-esterified fatty acids (NEFA) (P < 0.05) and increased conception rate (P < 0.05). In summary, the supplementation strategies adopted in this study improve the performance, metabolic status, and carcass traits of heifers under grazing, allowing an improvement in the conception rate of 15-month-old Nellore heifers.

Keywords

Animal nutrition Beef cattle Heifers Supplementation Tropical pastures 

Notes

Funding information

We are grateful to Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), and Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG) for supporting this study.

Compliance with ethical standards

All animal care and handling procedures were approved by the Animal Care and Use Committee of the Universidade Federal de Viçosa, Brazil (protocol CEUAP-UFV 0008).

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  • Daniel Mageste de Almeida
    • 1
  • Marcos Inácio Marcondes
    • 1
  • Luciana Navajas Rennó
    • 1
  • Luiz Henrique Pereira Silva
    • 1
  • Leandro Soares Martins
    • 1
  • David Esteban Contreras Marquez
    • 1
  • Faider Alberto Castaño Villadiego
    • 2
  • Felipe Velez Saldarriaga
    • 1
  • Julian David Castaño Franco
    • 1
  • Deilen Paff Sotelo Moreno
    • 1
  • Felipe Henrique de Moura
    • 1
  • Mário Fonseca Paulino
    • 1
  1. 1.Department of Animal ScienceUniversidade Federal de ViçosaViçosaBrazil
  2. 2.Department of Veterinary MedicineUniversidade Federal de ViçosaViçosaBrazil

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