Daily Faecal Excretion of Alkane \u3cem\u3eC\u3csub\u3e32\u3c/sub\u3e\u3c/em\u3e in Beef Cattle Females Grazing Natural Grasslands in Southern Brazil and in Uruguay

The n-alkane technique is accepted as an appropriate method to estimate herbage intake by grazing ruminants. This method reinforces issues similar to those raised by other methods based on markers such as the effect of carrier matrix or dosing method and frequency on the excretion kinetics of the dosed n-alkanes (Dove et al. 2002; Molina et al. 2004, Oliván et al. 2007). The time of dosage needed to reach the dynamical equilibrium between the concentrations of alkanes in the diet and in the faeces of ruminants is still unclear for the natural grassland environments. The aim of this study was to determine the appropriate timing of oral administration of alkane C32 to estimate herbage intake in beef heifers on natural grassland environments

Diversidade genética do Banco Ativo de Germoplasma de Pera avaliada com o uso de marcadores moleculares SSR.

O objetivo deste trabalho foi caracterizar e avaliar a diversidade genética entre os acessos de pereira existentes no Banco Ativo de Germoplasma de Pera (BAG-Pera) com o uso de marcadores moleculares SSR (Simple Sequence Repeats), visando organizar os recursos genéticos da espécie e apoiar as atividades de melhoramento genético

Diet switching by mammalian herbivores in response to exotic grass invasion.

Invasion by exotic grasses is a severe threat to the integrity of grassland ecosystems all over the world. Because grasslands are typically grazed by livestock and wildlife, the invasion is a community process modulated by herbivory. We hypothesized that the invasion of native South American grasslands by Eragrostis plana Nees, an exotic tussock-forming grass from Africa, could be deterred by grazing if grazers switched dietary preferences and included the invasive grass as a large proportion of their diets

Avaliação da diversidade genética do banco ativo de germoplasma de pera (BAG-Pera) utilizando marcadores moleculares SSR.

O objetivo deste trabalho foi caracterizar e avaliar a diversidade genética entre os acessos de pereira existentes no BAG-Pera utilizando marcadores moleculares SSR, visando organizar os recursos genéticos e apoiar as atividades de melhoramento genético

Variabilidade de cevada (Hordeum vulgare L.) em relação à tolerância ao alumínio.

Orientadora: Carla Andrea Delatorre, Coorientador: Jorge Fernando Pereira