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Samantha J Bush Gudrun Dittrich-Schröder Stefan Neser Caitlin Gevers Kwabena O Baffoe Bernard Slippers 《Southern Forests》2018,80(3):275-277
Leptocybe invasa, the blue gum chalcid, is a well-known pest of Eucalyptus globally. Since it was first observed in the Mediterranean and Middle East in 2000, it has spread to other countries where Eucalyptus have been planted. Efforts to control it have included the release of a number of larval and pupal parasitoids. This report serves as the first record of the presence of Quadrastichus mendeli in South Africa, a parasitoid originally released as a biological control agent of L. invasa in Israel. The interactions and potential impacts on the other insects in the L. invasa galls will need to be investigated. 相似文献
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Factors influencing reproductive performance of cows from different Nguni ecotypes in southern Mozambique 总被引:1,自引:1,他引:0
Maciel SM Amimo J Martins M Mwai AO Scholtz MM Neser FW 《Tropical animal health and production》2012,44(3):435-444
The objective of this study was to assess the reproductive performance of two Nguni ecotypes (Nguni and Landim) raised in
a subtropical environment to enhance strategies for livestock development and restocking programmes within the southern African
region. Reproduction data collected between 1996 and 2009 from 365 cows of the Landim and Nguni ecotypes were analysed. From
the results, ecotype, place of birth, year and season of birth/calving had significant effects on age at first calving (AFC)
and calving interval (CI). Overall means for AFC and CI were 1,071 ± 166 days and 432 ± 85 days, respectively, while average
calving rate was 88.0 ± 4.7%. Heifers born in the dry season had lower AFC than heifers born in the wet season. Heifers born
at Impaputo Breeding Center were the youngest at first calving, followed by the South African born ones. Heifers of the Landim
ecotype also calved younger than heifers of the Nguni ecotype. CI was shorter in wet seasons (main breeding seasons) than
in dry seasons. Interaction between ecotype and year–season (p < 0.005) showed that, in wet and dry seasons, Nguni cows had shorter CI than the Landim. This study demonstrates for the
first time a possible genotype-by-environment interaction between Nguni ecotypes. This might aid future cattle development
and restocking programmes in southern Africa taking into consideration the adaptation of indigenous genotypes and climate
change. 相似文献
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DE Boerner RD Kurtz JA Craven GM Ross FW Jones WJ Davis 《Science (New York, N.Y.)》1999,283(5402):668-670
The subcrustal lithosphere underlying the southern Archean Churchill Province (ACP) in western Canada is at least one order of magnitude more electrically conductive than the lithosphere beneath adjacent Paleoproterozoic crust. The measured electrical properties of the lithosphere underlying most of the Paleoproterozoic crust can be explained by the conductivity of olivine. Mantle xenolith and geological mapping evidence indicate that the lithosphere beneath the southern ACP was substantially modified as a result of being trapped between two nearly synchronous Paleoproterozoic subduction zones. Tectonically induced metasomatism thus may have enhanced the subcrustal lithosphere conductivity of the southern ACP. 相似文献
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Increased bleeding time, impaired blood clot retraction and decreased thrombocyte aggregation were observed in pigs infected with virulent haemadsorbing and non-haemadsorbing African swine fever virus isolates. These changes appeared to be more frequent and more severe in pigs infected with the haemadsorbing virus isolates than in those infected with the non-haemadsorbing isolate. Moreover, the onset and severity of these changes followed the numerical decrease and morphological damage to these cells apparent in the last 2-3 days of the disease. 相似文献
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When confronted with a novel familial disorder, veterinarians should consult McKusick's catalogue of inherited disorders in humans, called Mendelian Inheritance in Man (MIM), or its online version (OMIM), to see whether a similar disorder has been reported in humans. They should also consult the other readily available sources of comparative information on mice and domesticated species. Increasingly, such consultations can be conducted on the Internet via the World Wide Web. If it is thought that an animal disorder is homologous with a human disorder, publications describing the animal disorder should include the MIM number(s) for that disorder. Future research can then test the hypothesis of homology, until a consensus is reached. 相似文献
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