Exigências líquidas de minerais para ganho em peso de ovinos Santa Inês e Marada Nova

Abstract

The objective of this study was to estimate body composition and nutritional requirements of calcium (Ca), phosphorus (P), magnesium (Mg), potassium (K), sodium (Na), iron (Fe), copper (Cu) and Zinc (Zn), of Santa Inês sheep and Morada Nova. A total of 48 lambs uncastrated, 24 Santa Inês 24 of Morada Nova, with initial body weight of 21.7 ± 1,2 kg e 20,8 ± 0,8 kg, with 170 and 190 days, respectively, of which 12 were slaughtered at the beginning of the experiment to determine initial body composition. The 36 animals were divided into six groups of six animals, separated by slaughter weights (25, 28 and 31 kg) and genotypes (Santa Inês and Morada Nova). To determine the requirements, we used the comparative slaughter method. The body composition in minerals Santa Inês sheep ranged from 14.88 to 6.48 g of Ca, from 7.74 to 6.68 g of P, 1.92 to 1.77 g K, 1.74 to 1, 61 g of Na 0.82 to 0.59 g Mg 59.48 to 54.48 mg Fe, 36.10 to 18.84 mg of Zn and from 10.60 to 4.07 mg Cu per kg empty body (EBW) and was statistically different (p <0.05) the other race. Regarding the Morada Nova sheep mineral composition ranged from 12.76 to 9.21 g of Ca, 8.14 to 6.0 g of P, 1.78 to 1.68 g K, 1.47 to 1 , 32 g of In, 0.66 to 0.52 g Mg 73.41 to 42.38 mg Fe, 31.41 to 21.45 mg of Zn and 9.80 to 4.20 mg Cu per kg empty body (EBW). To compare the regression equations of the PCV, macro and micro minerals between the two genotypes, we used the test of parallelism to 5% probability, being significant for the prediction equations of the PCV, as well as, of all minerals. For Santa Inês sheep, the net requirements of gain ranged from 1.75 to 1.03 g Ca, 1.01 to 0.61 g of P, 0.38 to 0.21 g K, 0.38 to Na 0.16; 0.10 to 0.06 Mg 28.50 to 16.00 mg Fe, 6.14 to 3.22 mg Cu and Zn 22.99 to 14.00 mg / kg PCV gain. Regarding Morada Nova requirements ranged from 1.96 to 0.84 g Ca, 1.15 to 0.46 P, 0.39 to 0.19 K, 0.28 to 0.13 Na , 0.10 to 0.05 Mg 26.21 to 12.87 mg of Fe, 5.59 to 2.46 Cu and Zn 23.59 to 10.32 mg / kg gain PCV.