MA. Teixeira1, 2, A. Oliveira1, 2, K. Paulos1, 2, A. Leite1, 2, A. Marcia1, 3, A. Amorim1, 3, E. Pereira1, 3, S. Rodrigues1, 3 and S. R. Silva2, 4

1. School of Agriculture, Polytechnic Institute of Bragança, Campus Sta Apolónia Apt 1172, 5301-855 Bragança, PT 2. CECAV, Animal and Veterinary Research Centre
3. CIMO, Mountain Research Centre.
4. University of Trás-os-Montes and Alto Douro, Quinta de Prados, Apt 1013, 5001-801 Vila Real, PT.