Perfil endócrino, metabólico, composição de leite e taxa de prenhez de vacas girolanda recebendo dieta com gordura protegida

Abstract

Currently there is a growing worldwide demand for milk and as a productive areas are increasingly limited, it is necessary to seek a higher efficiency to produce more smaller area. The use of technology is fundamental for development, artificial insemination at fixed time (IATF) is a biotechnology that increases the reproductive performance of the herd and when associated with a nutritional strategy makes the most productive activity. Supplementation with protected fat to ruminants has shown good results with increased reproductive rates and productive livestock. The objective of this experiment was to evaluate the endocrine and metabolic response of dairy cows of the breed Girolando by supplemental protected fat (Megalac-E®, QGN, RJ, Brazil) based on calcium salts with polyunsaturated fatty acids (PF) by determining the hormonal profile, energy, protein and mineral associating the increase in reproductive rates of animals that underwent artificial insemination at fixed time (IATF). Were synchronized 35 multiparous lactating cows divided into two groups, the control group (G1) with conventional farm diet and treated group (G2) with addition of 250g of Megalac-E® (QGN, RJ, Brazil) in the diet during the beginning of sync until the diagnosis of pregnancy. It assessed whether supplementation with protected fat caused changes in the endocrine and metabolic profile by associating with changes in the pregnant rate of treated animals. Variation between different variability factors, verifying that, for the groups factor, differences were observed for glucose, cholesterol, urea, creatinine, uric acid, globulin, phosphorus, progesterone and T4. As for the collections factor changes were observed for glucose, fructosamine, β-hydroxybutyrate, total protein, urea, creatinine, uric acid, globulin, calcium, phosphorus, triglyceride and T3. Regarding the interaction between the factors Groups x collections, only to glucose and β-hydroxybutyrate were registered significant variations. There was no variation in the concentration of any endpoint in the milk of cows control and receiving Megalac-E both empty as pregnant. The pregnancy rate was higher , no group supplemented with Megalac-E. Supplementation with protected fat (Megalac - E®) in the diet of cows Girolando submitted to FRAI promotes proper metabolic answer, running as a precursor paragraph Metabolic regulation, without causing nutritional and metabolic disorders , in addition to promote increase in pregnant rate and maintain a milk quality with good chemical characteristics and cellularity.