Growth response and mineral blood levels of calcium, phosphorus, magnesium and potassium in crossbred steers (Taurus-Indicus) with complete mineral supplementation

Abstract

16 novillos mestizos fueron utilizados para evaluar el efecto de un suplemento mineral completo (SMC) sobre la ganancia diaria (GDP) y total de peso (GTP), concentraciones sanguíneas de Ca, P, Mg, K, hemoglobina (Hb) y porcentaje de hematocrito (Htc). Los animales se estabularon durante 140 días y distribuidos en 4 tratamientos: T1, suplemento basal (63% de maíz amarillo molido, 30% de harina de soya, 5% de melaza de caña y 3% de urea) + heno; T2, suplemento basal (SB) + heno + 50 g/animal/día de SMC; T3, dieta basal + heno + 100 g/animal/día de SMC; T4, SB + heno + 150 g/animal/día de SMC. Cada 14 días fueron pesados los animal y se tomaron muestras sanguíneas al inicio, a los 60 días y al final para determinar Ca, Mg, P, K, hemoglobina (Hb) y el Hematocrito (Hct). Los datos se analizaron por el procedimiento GLM del SAS. La GDP refirió valores superiores (P<0,05) para los tratamientos; 2, 3 y 4 (0,739; 0,778 y 0,759 kg/día respectivamente) vs. el tratamiento 1(0,626 kg/día), similarmente se manifestó la GTP (T2: 81,33; T3: 85,67 y T4: 83,58 kg, vs. T1: 68,87 kg). El Ca, Mg y K sanguíneos para T2, T3 y T4 (11,47; 10,80 y 11,08 mg Ca/dl respectivamente: 2,81; 2,89 y 2,84 mg Mg/dl, respectivamente: 23,68, 21,93 y 25,83 mg K/dl respectivamente) superan (P<0,1) a T1 (9,4 mg Ca/dl: 2,23 mg Mg/dl y 19,92 mg K/dl). Los valores sanguíneos de fósforo para T3 y T4 (5,94 y 6,02 mg/dl respectivamente) son superiores (P<0,1) a T1 y T2 (5,24 y 5,54 mg/dl respectivamente). No existen diferencias estadísticas para Hb y Hct. De acuerdo a los resultados de esta investigación, el SMC en dosis de 50 y 100 g/animal/día fue efectivo en promover una adecuada tasa de crecimiento.221 - [email protected] crossbred beef steers were used to determine the effect of a mineral supplement (SMC) on the daily gain (GDP) and the total weight gain (GTP). Blood levels of Ca, P, Mg, K, hemoglobine (Hb) and hematocrite (Htc) were also determined. The animals were kept in feed lots for 140 days and randomly distributed into one of four treatment groups: T1; Basal supplementation (63% corn meal, 30% soybean meal, 5% molasses cane and 3% urea) + hay: T2; Basal supplementation (SB) + hay + 50 g/animal/day of SMC: T3; SB + hay +100 g/animal/day of SMC: T4; SB + hay + 150 g/animal/day of SMC. Blood samples were take every 14 days. Data was analyzed using of GLM procedure of SAS. Treatments 2, 3 and 4 reached greater values (P<0.05) for GDP and GTP (0.739; 0.778 and 0.759 kgs/day and 81.33; 85.67 and 83.58 kgs respectively) compared to treatment 1 (0.626 kgs/days and 68.87 kgs, respectively). Blood levels for Ca (11.47; 10.80 and 11.08 mg/dl respectively), Mg (2.81; 2.89 and 2.84 mg/dl respectively) and K (23.68; 21.93 and 25.83 mg/dl respectively) in treatments 2, 3 and 4 were higher (P<0.1) than those for treatment 1 (9.4 Ca mg/dl; 2.22 Mg mg/dl and 19.92 K mg/dl). Blood levels of P for treatments 3 (5.94 mg/dl) and 4 (6.02 mg/dl) were higher (P<0.1) than those measured in treatments 1 (5.24 mg/dl) and 2 (5.54 mg/dl). No statistical differences were evident for Hb and Hct. Results of the present study indicate that the SMC in doses of 50 and 100 gr./animal/day an effective growth promoter

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