Asian-Australasian Journal of Animal Sciences

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Energy Requirements for Maintenance and Growth of Male Saanen Goat Kids

  • Medeiros, A.N. (Department of Animal Science, Universidade Federal da Paraiba (UFPB)) ;
  • Resende, K.T. (Department of Animal Science, Universidade Estadual Paulista (UNESP)) ;
  • Teixeira, I.A.M.A. (Department of Animal Science, Universidade Estadual Paulista (UNESP)) ;
  • Araujo, M.J. (Department of Animal Science, Universidade Federal do Piaui (UFPI)) ;
  • Yanez, E.A. (Department of Animal Production, Universidad Nacional Del Nordeste (UNNE)) ;
  • Ferreira, A.C.D. (Department of Animal Science, Universidade Federal de Sergipe (UFS))
  • Received : 2013.11.27
  • Accepted : 2014.04.28
  • Published : 2014.09.01
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Abstract

The aim of study was to determine the energy requirements for maintenance and growth of forty-one Saanen, intact male kids with initial body weight (BW) of $5.12{\pm}0.19$ kg. The baseline (BL) group consisted of eight kids averaging $5.46{\pm}0.18$ kg BW. An intermediate group consisted of six kids, fed for ad libitum intake, that were slaughtered when they reached an average BW of $12.9{\pm}0.29$ kg. The remaining kids (n = 27) were randomly allocated into nine slaughter groups (blocks) of three animals distributed among three amounts of dry matter intake (DMI; ad libitum and restricted to 70% or 40% of ad libitum intake). Animals in a group were slaughtered when the ad libitum-treatment kid in the group reached 20 kg BW. In a digestibility trial, 21 kids (same animals of the comparative slaughter) were housed in metabolic cages and used in a completely randomized design to evaluate the energetic value of the diet at different feed intake levels. The net energy for maintenance ($NE_m$) was $417kJ/kg^{0.75}$ of empty BW (EBW)/d, while the metabolizable energy for maintenance ($ME_m$) was $657kJ/kg^{0.75}$ of EBW/d. The efficiency of ME use for NE maintenance ($k_m$) was 0.64. Body fat content varied from 59.91 to 92.02 g/kg of EBW while body energy content varied from 6.37 to 7.76 MJ/kg of EBW, respectively, for 5 and 20 kg of EBW. The net energy for growth ($NE_g$) ranged from 7.4 to 9.0 MJ/kg of empty weight gain by day at 5 and 20 kg BW, respectively. This study indicated that the energy requirements in goats were lower than previously published requirements for growing dairy goats.

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