Desempenho reprodutivo de vacas Marchangus primíparas e pluríparas suplementadas com concentrado

Abstract

Brazil stands out on the world stage as a major beef exporter and thus come the challenges of improving productivity levels in the country's cattle. The study strategies to improve reproductive performance in herds and increase birth rates becomes necessary, since world demand for meat is growing. Through this, the objective was to evaluate the reproductive performance of primiparous cows and Marchangus pluriparous with nestling of different body scores supplemented with concentrate. The experiment was conducted at the farm in the municipality of San Marcos Dois Vizinhos, Paraná. If you use 13 Marchangus cows with body condition score ≤ than 2.5 and 3 to 3.5 (scale 1 to 5) over 45 days after delivery, and 6 primiparous cows and 7 pluriparous, kept in pasture cynodon sp with mineral salt and water at will. The concentrate supplementation was 1 kg to 100 kg of live animal weight / day, the trough containing 16% crude protein. The experiment was conducted over 90 days, adopting the following methodologies: gynecological examination on day 0, day heat detection and exposure of cows 1 bull Marchangus. Every 30 days was assessed the body condition and weight of the animals. Evaluation uterus and ovaries were performed by rectal palpation on day 0, 30, 60 and 90. Perimeter ovaries were obtained from measurements of length and width by ultrasonography on days 0 and 60. On days 0, 30 and 60 was performed weaning interrupted for 48 hours. estrus data, ovary and uterus scores, and pregnant were analyzed for supplementation check the different groups. In the final period was obtained pregnant rate of 83.33% for gilts and 85.71% for pluriparous. It is concluded that supplementation with concentrated postpartum period combined with weaning interrupted is advantageous to return the cyclicality and pregnant gilts both Marchangus cows as pluriparous.