Influência da somatotropina recombinante bovina (rBST) sobre parâmetros metabólicos, hormonais e de qualidade de sêmen em touros

• Autor(a) principal: Vieira, Marcelo Brandi
• Data de Publicação: 2007
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFPel - Guaiaca
• Texto Completo: http://repositorio.ufpel.edu.br/handle/ri/2541
• topic: Veterinária; Metabolismo; Touros; rBST; Reprodução; Bulls; Metabolism; rBST; Reproduction; CNPQ::CIENCIAS AGRARIAS::MEDICINA VETERINARIA

The growth hormone (GH) have as main function improve proliferation and cellular development, but also participates of processes related to the immune system and reproductive function. The effect of GH is exerted by the IGF-I (insulin-like growth factor I), that is a hormone polypeptidic mitotic secreted by all cells that carry through mitosis. Since the development of the recombinant form of the bovine recombinant somatotropin (rBST) various studies have been developed on milk and meat production in farm animals. The objective of this study was to evaluate the effect of rBST on metabolic markers of energetic, protein, mineral and hepatic metabolism, as well as, to evaluate its effect on concentrations of IGF-I, insulin and quality parameters semen in bulls. This study was carried in central of artificial insemination ABS/PECPLAN using 20 bulls of european breeds. These animals were divided in two groups, a group that received a placebo application (NaCl, 0.9%) and another that received rBST (Lactotropin®/Elanco Animal Health). Five blood collections for evaluation of metabolic and hormonal markers and 6 semen collections with posterior freezing for the accomplishment of the corresponding semen evaluations. There was no effect of rBST (P > 0,05) in metabolic markers, except in the concentration of gamma- glutamyltransferase (GGT), that increased in the group that received rBST (P < 0,05), but inside the physiological range, in the hormones evaluations, IGF-I increased in the group treated with rBST (P < 0,05), but there wasn t difference in the insulin concentrations (P > 0,05). In relation to the semen evaluations, there were no differences observed (P > 0,05) in motility and morphology evaluated in the period before freezing. In after freezing evaluations, being that motility, morphology, integrity of plasmatic membrane by fluorescent sounding leads and the hiposmotic test, differences have been observed (P < 0,05) between groups, showing beneficial effect of rBST in these characteristics. In this way can be observed that rBST, beyond raising the IGF-I levels positively influenced the seminal after freezing characteristics evaluated without causing disequilibrium in the metabolism of treated animals since the concentrations of the evaluated metabolic markers were in accordance with the physiological standards for the bovine species.