|Support type:||Scholarships in Brazil - Doctorate|
|Effective date (Start):||November 01, 2009|
|Effective date (End):||September 30, 2012|
|Field of knowledge:||Agronomical Sciences - Veterinary Medicine - Animal Reproduction|
|Principal Investigator:||Francisco Palma Rennó|
|Grantee:||Jefferson Rodrigues Gandra|
|Home Institution:||Faculdade de Medicina Veterinária e Zootecnia (FMVZ). Universidade de São Paulo (USP). São Paulo , SP, Brazil|
The transition period is considered extremely important step in the production cycle of dairy cows according to the occurrence of several changes in metabolism and physiology of the animal. These changes, mediated by hormonal and metabolic responses are from the modification of physiological status predominant, alternating a state of pregnant and non-lactation for another non-pregnant and lactation, where changes in power and handling at that stage of production, may result in significant changes in animal metabolism, altering the productive and reproductive performance of animals during the production cycle. Recent literature shows that despite efforts are being directed in some centers in conducting research projects in this area, these studies revealed the need to increase the number of projects conducted in the area because of the complexity of the issue and its implications, especially economic in feeding and management of dairy cows in the transition period. This scenario highlights the need, importance and difficulty of developing research to understand the effects of changes in nutrition and metabolism in animal management, with consequent alteration of the reproductive and productive response. At the level of Brazil, the research in this area are scarce, according to the experimental difficulties related to the subject, the subject of a relatively recent or even the need of the projects being developed evaluating different areas of knowledge, showing marked multidisciplinary.This study aims to evaluate the effects of different sources of unsaturated fatty acid supplement to diet in the transition period and early lactation on the quality of oocytes and embryo, the concentrations of plasma metabolites and hormones, the production and composition of milk, reproductive performance, ruminal fermentation and digestibility of diets in Holstein dairy cows.