Th e timing of phenological events varies within and among populations, aff ecting the performance of individual plants diff erently. We evaluated the eff ects of relative variation in sprouting time on the display of reproductive events, vegetative growth and herbivory in Copaifera langsdorffi i (Fabaceae). A total of 93 trees of C. langsdorffi i was monitored daily to determine their sprouting time. We collected ten terminal branches of each plant to evaluate vegetative growth, production of defense compounds and insect herbivore damage. Th e sprouting time for the studied population lasted 67 days. Variation in sprouting time did not aff ect the probability of plants to enter the reproductive stage. Plants that entered the reproductive stage showed greater vegetative biomass. Variation in sprouting time had a negative relationship with branch growth and a positive relationship with the number of leafl ets. Leaf phenol concentration did not vary in relation to sprouting time or plant phenology, but herbivory was higher in plants that sprouted later. Th e relationships among plant sprouting time, vegetative development and display of reproductive stage in C. langsdorffi i are discussed. Th e results of this study also suggest that early sprouting prior to the rainy season is a strategy used by C. langsdorffi i to escape herbivores attacks.

RESUMO.Objetivou-se verificar a existência de resistência anti-helmíntica a ivermectina e albendazol em nematoides gastrintestinais de ovinos em propriedades dos municípios de Janaúba e Nova Porteirinha. O experimento foi conduzido em 4 propriedades e foram utilizados 88 animais. Nas fazendas (A e B), testou-se o anti-helmíntico ivermectina e nas fazendas (C e D), ivermectina e albendazol. A redução na contagem de ovos por grama de fezes (RCOF) foi determinada utilizando fórmula específica, indicando resistência com índice menor a 95%. Houve resistência dos nematoides gastrintestinais ao albendazol nas duas propriedades em que foi testado e a ivermectina em três das quatro propriedades. Na fazenda C, a ivermectina apresentou-se eficácia de 97%. O nematoide de maior prevalência foi o Haemonchus contortus.Palavras chave: helmintos, ivermectina, albendazol, anti-helmínticos, eficácia Antihelminth resistance in gastrointestinal nematodes of sheep ABSTRACT. The objective was to verify the existence of antihelminthic resistance in gastrointestinal nematodes of sheep in properties of the municipalities of Janaúba and Nova Porteirinha. The experiment was conducted at 4 properties, and was done as coproparasitological analyzes in fecal samples of 88 animals. In the farms (A and B) there was a division of the animals into two groups: control and immersion and in farms (C and D) in three groups: control, ivermectin and albendazole. Each group has 6 animals. The reduction of fecal grain contamination (RCOF) was determined based on the specific formula, indicating a percentage greater than or equal to 95%. There was resistance of the gastrointestinal nematodes to albendazole in the two properties in which it was tested and ivermectin in three of the four properties. In farm C, ivermectin showed efficacy of 97%. The most prevalent nematode was Haemonchus contortus.