Composição corporal e exigências nutricionais de macro e micro mineral de ovinos da raça morada nova

Abstract

This work was carried out to determine body composition and net requirements of macro minerals (calcium , phosphorus, magnesium , potassium and sodium ) and trace minerals ( iron, zinc, manganese and copper ) for maintenance and weight gain of Morada Nova lambs fed diets containing different levels of metabolizable energy (ME). 48 lambs were used, not castrated, with average initial body weight (BW) of 12.20 kg ± 2.05 and approximately 60 days of age. After 10 days of adaptation, eight randomly chosen animals were slaughtered animals as a reference to estimate the initial empty body weight (PCVZi) and initial body composition of the remaining 40 animals, which were placed in individual stalls. The animals were divided into five treatments with increasing levels of metabolizable energy (0.96, 1.28, 1.72, 2.18 and 2.62 Mcal / kg DM) in randomized and randomized block design with eight replications. When the average body weight (BW) treatment reached 25 kg, all animals of treatment, along with two animals of the (0.96 Mcal / kg DM) group were slaughtered. This procedure was performed for each group until the slaughter of all animals in the experiment. Body composition varied from 9.64 to 9.39 g Ca; 6.83 to 6.59 g P; 0.34 to 0.33g of Mg; From 2.35 to 2.02 g of K and 1.86 to 1.98 g of Na per kg body weight of the empty (EBW). The net requirements for weight gain of the animals of this study ranged from 7.3 to 7.1 g Ca; From 5.10 to 4.90 g P; 0.26 g of Mg; 1.50 to 1.30 g of K and from 1.60 to 1.90 g Na per kg gain BW. The dietary requirements of Ca, P, Mg, K and Na to 20kg animals with BW and daily gain of 200 g / day was 2.12; 1.57; 0.30; 0.28 and 0.38 g, respectively. Body composition of trace elements ranged from 52.37 to 51.13 mg Fe; 27.23 to 26.55 mg Zn; 2.16 to 2.78 mg manganese; 2.30 to 2.61 mg Cu per kg of empty body weight (EBW). The net requirements for weight gain of the animals of this study ranged from 39.71 to 38.76 mg Fe; 20.61 to 20.09 mg Zn; 2.21 to 2.85 mg manganese; 2.08 to 2.39 mg Cu per kg gain BW.