Stable Isotopes to Trace Migratory Birds and to Identify Harmful Diseases: An Introductory Guide

Animal Ecology; Monitoring/Environmental Analysi

Trypanosoma congolense infection in sheep: Ultrastructural changes in the skin prior to development of local skin reactions

Events occurring in the skin of sheep prior to development of Trypanosoma congolense-induced local skin reactions (chancres) were studied using electron microscopy. Three days after infection, few trypanosomes were present in the dermal collagen. However, these parasites were more abundant 5 days after infection, and were also found in dermal lymphatics and in the connective tissue matrix between collagen bundles. Mast cells in the skin obtained 5 days after infection showed evidence of degranulation. These events may play a role during the induction phase of trypanosomal chancres

Stable Isotopes to Trace Migratory Birds and to Identify Harmful Diseases: An Introductory Guide

Animal Ecology; Monitoring/Environmental Analysi

The effect of Trypanosoma vivax infection on late pregnancy and post-partum return to cyclicity in Boran cattle

A study was designed to examine the effect of infection with Trypanosoma vivax KETRI 2501 on the maintenance of pregnancy and post-partum return to reproductive normality in susceptible Galana and trypanotolerant Orma Boran heifers during the third trimester of pregnancy. One out of three Galana heifers had a premature birth and subsequent perinatal mortality. Of the two heifers that produced live calves, one of the calves died shortly after birth, while the other survived. Two out of three Orma heifers had premature births, and all three calves died shortly after survived. Two out of three Orma heifers had premature births, and all three calves died shortly after birth. All control animals produced live calves at term, which all survived. Infection with T. vivax during the third trimester of pregnancy delayed the resumption of ovarian activity after calving, with the Ormas taking a significantly (