Performance of Holstein-Gyr crossbred heifers on pasture of Brachiaria decumbens supplemented with multiple supplement or proteined salt/Desempenho de novilhas Girolandas em pasto de Brachiaria decumbens suplementadas com mistura multipla ou sal proteinado

• Published in: Acta scientiarum. Animal sciences 2017-10, Vol.39 (4), p.371
• Main Authors: dos Santos, Ronald Matos, Lana, Rogerio de Paula, Teixeira, Cesar Roberto Viana
• Format: Article
• Language: Spanish
• ISSN: 1806-2636
• DOI: 10.4025/actascianimsci.v39i4.36013

This study aimed to evaluate the performance, efficiency and economic viability of different supplements for dairy heifers on Brachiaria decumbens pasture. Twelve heifers with 186 [+ or -] 30.5 kg average weight were divided in three groups of four animals. The treatments were mineral salt ad libitum; 0.4 kg [animal.sup.-1] [day.sup.-1] proteined salt and 1.0 kg [animal.sup.-1] [day.sup.-1] multiple supplement. The experimental design was randomized blocks, with the contrasts considered significant at 5% probability. There was greater (p < 0.05) body weight and higher daily weight gain in animals supplemented with proteined salt or multiple supplement, compared to supplemented with mineral salt. There was no difference (p > 0.05) in any of the performance parameters between proteined salt and multiple supplement. The use efficiency was 1.31 and 0.61 for proteined salt and multiple supplement, respectively. The cost per kg weight gain in treatments with mineral salt, proteined salt and multiple supplement was R$ 0.67, R$ 0.68 and R$ 1.25, respectively. The use of proteined salt or multiple supplement provides superior performance than mineral salt in crossbred heifers. However, the proteined salt has higher utilization efficiency and economic advantage. Keywords: agrosilvipastoral system, crossbred cows, protein supplementation. O objetivo deste trabalho foi avaliar o desempenho, a eficiencia e a viabilidade economica de diferentes suplementos para novilhas, em pasto de Brachiaria decumbens. Foram utilizadas 12 novilhas, divididas em tres grupos de quatro animais, com peso medio de 186 [+ or -] 30,5 kg. Os tratamentos foram: sal mineral ad libitum; 0,4 kg [animal.sup.-1] [dia.sup.-1] de sal proteinado e 1,0 kg [animal.sup.-1] [dia.sup.-1] de mistura multipla. O delineamento experimental utilizado foi o de blocos casualizados, sendo os contrastes considerados significativos a 5% de probabilidade. Houve maior (p < 0,05) peso corporal e maior ganho de peso diario dos animais suplementados com sal proteinado ou mistura multipla, em comparacao aos suplementados com sal mineral. Nao houve diferenca (p > 0,05) entre sal proteinado e mistura multipla em nenhum dos parametros de desempenho. A eficiencia de uso foi de 1,31 e 0,61 para sal proteinado e mistura multipla, respectivamente. O custo por kg de peso ganho nos tratamentos sal mineral, sal proteinado e mistura multipla foi R$ 0,67, R$ 0,78 e R$ 1,25, respectivamente. A utilizacao de sal proteinado ou mistura m