Exigências nutricionais de minerais de ovinos da raça Somális Brasileira

Abstract

The objective of this study was to determine mineral body composition and net requirements of macro and microminerals for growth of Brazilian Somalis lambs. Were used forty-eight lambs, non-castrated, with an average initial body weight (BW) of 13.47±1.76 kg and about 50 days old. Eight animals were slaughtered at the start of the trial, as a reference group, in order to estimate the initial empty body weight (EBW) and body composition. The remaining animals were randomly divided into five treatments consisted of different energy levels (1.18, 2.07, 2.25, 2.42 and 2.69 Mcal/kg DM),with eight replications per treatment. The macromineral body composition ranged from 6.45 to 6.34 g of Ca/kg EBW, 4.32 to 3.60 g of P/kg EBW, 0.20 to 0.19 g Mg/kg EBW, 1.12 to 1.05 g g Na/kg EBW, and 1.74 to 1.43 g K/kg EBW in Somalis Brasileira lambs with BW that ranged from 15 to 30 kg. The maintenance requirements were 52.50 mg Ca, 27.59 mg P, 1.26 mg Mg, 4.12 mg Na and 7.44 mg K/kg BW. The net macromineral requirements ranged from 5.22 to 5.13 g Ca; 2.77 to 2.31 g P; 0.16 to 0.15 g Mg; 0.86 to 0.81 g Na and 1.10 to 0.90 g K/kg BW for animals with BW ranging from 15 to 30 kg. The micromineral body composition ranged from 20.19 to 16.82 mg Zn/kg EBW, 56.23 to 48.12 mg Fe/kg EBW, 1.20 to 0.99 mg Mn/kg EBW and 1.31 to 1.03 mg Cu/kg EBW in Somalis Brasileira lambs with BW that ranged from 15 to 30 kg. The maintenance requirements were 0.133 mg Zn, 0.271 mg Fe, 0.003 mg Mn and 0.015 mg Cu/kg BW. The net micromineral requirements ranged from 12.97 to 10.80 mg Zn; 37.65 to 32.22 mg Fe; 0.76 to 0.63 mg Mn and 0.77 to 0.60 mg Cu/kg BW for animals with BW ranging from 15 to 30 kg.