<p>Progesterone concentrations were measured by radioimmunoassay in fat-free milk samples obtained weekly from 26 primiparous, suckling cows, raised in range conditions. Samples were collected in post partum period up to observation of first signs of estrus. Profiles of progesterone concentrations for early pregnancy diagnosis were also examined on milk samples taken 21 days after artificial insemination. Results showed ovarian ciclicity starting 9.89 weeks post partum in crossed Gir x Caracu cows, with 0.28 nmol/1 progesterone on the day of estrus anti 7.62 nmol/1 21 days post Al. In crossed Nelore x Caracu cows, these results were 12.08 weeks, 0.46 nmol/1 and 9.23 nmol/1, respectively. Ten pregnancies out of 12 diagnosed were confirmed by rectal palpation. There was one case of embryo mortality and three AI were practiced during luteal phase. Estrus observation efficiency was 52.94%, since out of 34 heats identified through hormonal determinations, 18 were detected visually. Variations between crossings did not significantly alter progesterone profiles on day of estrus, nor on 21^thday after AI or as for ovarian activity post partum.</p> | <p>Foram avaliados os períodos pós-parto de vacas primíparas mestiças Gir x Caracu e Nelore x Caracu mantidas em regime extensivo de pastagem. Para a determinação dos níveis hormonais de progesterona, amostras de leite foram coletadas semanalmente até que os animais apresentassem o 1º estro perceptível, quando foram inseminadas artificialmente. Decorridos 21 dias da inseminação, amostras foram coletadas e dosadas para fazer o diagnóstico precoce de gestação. Os resultados mostraram início de ciclicidade ovariana com 9,89 semanas após o parto para vacas Gir x Caracu, com valores médios de progesterona de 0,28 nmol/l no dia do estro e 7,62 nmol/1 aos 21 dias após a inseminação. Para vacas Nelore x Caracu, o estro se deu com 12,08 semanas após o parto e com valores médios de progesterona de 0,46 nmol/l e 9.23 nmol/1 para o dia do estro e no 21º dia, respectivamente. Dez gestações de doze diagnosticadas no 21º dia foram confirmadas por palpação retal, tendo ocorrido um caso de mortalidade embrionária precoce. Outras três vacas foram inseminadas durante a fase luteínica. A eficiência na observação de estros foi de 52.94%, pois de 34 identificados pelos níveis hormonais, 18 foram percebidos visualmente. A variação entre os cruzamentos não alterou significativamente o nível de progesterona no dia do estro, tampouco no 21º dia após inseminação e também quanto ao período necessário ao reinício da atividade ovariana pós - parto.</p>

From brain samples collected from domestic animals in Ethiopia, two rabies-related viruses were isolated. According to their reactivity pattern with anti-nucleocapsid monoclonal antibodies, they were characterized as Lagos bat virus (isolate Eth-58) and Mokola virus (isolate Eth-16). This classification was confirmed by neutralization experiments with Mokola and Lagos bat specific antisera. Two potent anti-rabies vaccines were unable to protect mice against the two rabies-related viruses. In order to investigate molecular relationships to classical rabies virus, cDNA cloning and sequencing was performed. The RNA genome of both viruses comprises 12 kilobases (kb) and has an organization similar to that of rabies virus with the gene order 3'-N-P-M-G-L-5'. Using virus-specific cDNA as probes in heterologous hybridization experiments, the RNAs of other members of lyssavirus serotypes 2 and 3 were detected. From hybridization experiments and sequence analysis of the 3' terminal 5,5 kb of the genomes, Eth-16 and Eth-58 viruses were shown to be equally genetically distant from rabies virus with 60% nucleotide identity; Eth-16 and Eth-58 had 68% homology.