Comparative study of folicular population in nelore and angus cows

• Grant number: 12/20497-4
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: November 01, 2012
• End date: October 31, 2013
• Field of knowledge: Agronomical Sciences - Veterinary Medicine - Animal Reproduction
• Principal Investigator: Barbara Loureiro
• Grantee: Viviane Queiroz de Araújo
• Host Institution: Instituto de Biociências (IBB). Universidade Estadual Paulista (UNESP). Campus de Botucatu. Botucatu , SP, Brazil

Abstract

The follicular development in bovine happens in a pattern of two or three waves perestral cycle. It is characterized by a synchronized development of many follicles, where onlyone will become dominant. The number of follicles that are recruited in each wave variesbetween animals; however it is very repeatable in each individual. Studies have showed thatBos indicus animals recruit more follicles than Bos taurus animals. This follicle populationinvolves the female fertility and can be associated with endocrine profiles and expression ofgenes related to follicle recruitment. The goal of the present study is to quantify and classifyovarian follicles in Nelore (Bos indicus) e Aberdeen Angus (Bos taurus) cows. To do so, wewill evaluate 10 sections of the ovary of each animal, fixel in parafin and stained with eosinand hematoxilin. This project is part of a research grant (2011/50964-0) that is evaluating thehormonal concentrations, gene expression and proteins involved in foliculogenesis.