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Productive performance and reproductive characteristics of Morada Nova male lambs fed with high-energy diet

  • Andréa do Nascimento Barreto
  • André Guimarães Maciel e Silva
  • Sergio Novita Esteves
  • Manuel Antonio Chagas Jacinto
  • Waldomiro Barioni Junior
  • Felipe Zandonadi Brandão
  • Messy Hannear de Andrade Pantoja
  • Daniela Botta
  • Narian Romanello
  • Amanda Prudêncio Lemes
  • Alessandro Giro
  • Alexandre Rossetto GarciaEmail author
Regular Articles

Abstract

Morada Nova breed sheep are without wool, tropicalized, small-sized animals, known for their high-quality meat and skin. Their body development naturally depends on the genetic potential and adequate nutritional support, which suggests that the offer of high-energy density diets positively influences their productive indicators. Thus, the present study investigated the effect of a high-energy diet for the Morada Nova lambs on body development and testicular function, considering their histomorphometric characteristics and seminal quality. Forty-two males (19.2 weeks, 20.7 ± 3.5 kg) were equally divided into two groups and fed with 2.05 Mcal (G7, n = 21) or 2.37 Mcal (G24, n = 21) of metabolizable energy/day, equivalent to 7% and 24% above the minimum for growing lambs. The animals were confined for 23 weeks (W0 to W23). Weight and body score differed significantly from the W1 (P < 0.05). From the W5, thoracic perimeter, body length, wither height, and rump attributes were higher in G24 (P < 0.05). The scrotal circumference and testicular volume were higher in G24 from the W3 (P < 0.05). Although testosterone levels were not affected (P = 0.05), the highest energy intake increased the diameter of the seminiferous tubules and the development of the epididymal epithelium (P < 0.05). This positively influenced the seminal quality and reduced the minor defects (21.87% vs. 17.13%) and the total spermatic defects (26.34% vs. 21.78%, P < 0.05). Thus, it is possible to employ higher levels of dietary energy for Morada Nova young males to express higher productive efficiency and earlier reproductive attributes of interest.

Keywords

Ovis aries Hair sheep Performance Morphometry Sperm 

Notes

Acknowledgments

This project was supported by Embrapa-Brazilian Agricultural Research Corporation (BIOTEC Network Grant No. 01130600105), Federal University of Pará (UFPA/PROPESP), CAPES (Pró-Amazônia Biodiversity and Sustainability Program), and CNPq—Conselho Nacional de Desenvolvimento Científico e Tecnológico (Grant No. 831591/1999-4). The authors also thank Dr. Júlio Balieiro and Dr. Sarita Gallo for the critical review of the manuscript.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest. All co-authors participated in the execution of the research, in the writing of this article, and they agree with this final version.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  • Andréa do Nascimento Barreto
    • 1
  • André Guimarães Maciel e Silva
    • 1
  • Sergio Novita Esteves
    • 2
  • Manuel Antonio Chagas Jacinto
    • 2
  • Waldomiro Barioni Junior
    • 2
  • Felipe Zandonadi Brandão
    • 3
  • Messy Hannear de Andrade Pantoja
    • 4
  • Daniela Botta
    • 1
  • Narian Romanello
    • 4
  • Amanda Prudêncio Lemes
    • 5
  • Alessandro Giro
    • 1
  • Alexandre Rossetto Garcia
    • 2
    Email author
  1. 1.Institute of Veterinary MedicineFederal University of ParáCastanhalBrazil
  2. 2.Laboratory of Animal Reproduction, Brazilian Agricultural Research CorporationEmbrapa Southeast Livestock/Embrapa Pecuária Sudeste (CPPSE/Embrapa)São CarlosBrazil
  3. 3.Faculty of Veterinary MedicineFluminense Federal UniversityNiteróiBrazil
  4. 4.University of São PauloPirassunungaBrazil
  5. 5.São Paulo State University “Júlio de Mesquita Filho”JaboticabalBrazil

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