scholarly journals Convergence in the macroscopic anatomy of the reticulum in wild ruminant species of different feeding types and a new resulting hypothesis on reticular function

2009 ◽  
Vol 281 (1) ◽  
pp. 26-38 ◽  
Author(s):  
M. Clauss ◽  
R. R. Hofmann ◽  
W. J. Streich ◽  
J. Fickel ◽  
J. Hummel
2008 ◽  
Vol 269 (2) ◽  
pp. 240-257 ◽  
Author(s):  
Reinold R. Hofmann ◽  
W. Jürgen Streich ◽  
Jörns Fickel ◽  
Jürgen Hummel ◽  
Marcus Clauss

2014 ◽  
Vol 45 (1) ◽  
pp. 65 ◽  
Author(s):  
Adam O Michel ◽  
Alexander Mathis ◽  
Marie-Pierre Ryser-Degiorgis

Author(s):  
I.G. Horak ◽  
H. Golezardy ◽  
A.C. Uys

The objective of this study was to assess the host status of the three largest southern African wild ruminants, namely giraffes, Giraffa camelopardalis, African buffaloes, Syncerus caffer, and eland, Taurotragus oryx for ixodid ticks. To this end recently acquired unpublished data are added here to already published findings on the tick burdens of these animals, and the total numbers and species of ticks recorded on 12 giraffes, 18 buffaloes and 36 eland are summarized and discussed. Twenty-eight ixodid tick species were recovered. All stages of development of ten species, namely Amblyomma hebraeum, Rhipicephalus (Boophilus) decoloratus, Haemaphysalis silacea, Ixodes pilosus group, Margaropus winthemi, Rhipicephalus appendiculatus, Rhipicephalus evertsi evertsi, Rhipicephalus glabroscutatum, Rhipicephalus maculates and Rhipicephalus muehlensi were collected. The adults of 13 species, of which the immature stages use small mammals as hosts, namely Haemaphysalis aciculifer, Hyalomma glabrum, Hyalomma marginatum rufipes, Hyalomma truncatum, Ixodes rubicundus, Rhipicephalus capensis, Rhipicephalus exophthalmos, Rhipicephalus follis, Rhipicephalus gertrudae, Rhipicephalus lounsburyi, Rhipicephalus lunulatus, Rhipicephalus pravus group and Rhipicephalus simus, were also collected.


2016 ◽  
Vol 54 (10) ◽  
pp. 2503-2512 ◽  
Author(s):  
Zamantungwa T. H. Khumalo ◽  
Helen N. Catanese ◽  
Nicole Liesching ◽  
Paidashe Hove ◽  
Nicola E. Collins ◽  
...  

Bovine anaplasmosis caused by the intraerythrocytic rickettsial pathogenAnaplasma marginaleis endemic in South Africa.Anaplasma marginalesubspeciescentralealso infects cattle; however, it causes a milder form of anaplasmosis and is used as a live vaccine againstA. marginale. There has been less interest in the epidemiology ofA. marginalesubsp.centrale, and, as a result, there are few reports detecting natural infections of this organism. When detected in cattle, it is often assumed that it is due to vaccination, and in most cases, it is reported as coinfection withA. marginalewithout characterization of the strain. A total of 380 blood samples from wild ruminant species and cattle collected from biobanks, national parks, and other regions of South Africa were used in duplex real-time PCR assays to simultaneously detectA. marginaleandA. marginalesubsp.centrale.PCR results indicated high occurrence ofA. marginalesubsp.centraleinfections, ranging from 25 to 100% in national parks. Samples positive forA. marginalesubsp.centralewere further characterized using themsp1aSgene, a homolog ofmsp1α ofA. marginale, which contains repeats at the 5′ ends that are useful for genotyping strains. A total of 47 Msp1aS repeats were identified, which corresponded to 32A. marginalesubsp.centralegenotypes detected in cattle, buffalo, and wildebeest. RepeatAnalyzer was used to examine strain diversity. Our results demonstrate a diversity ofA. marginalesubsp.centralestrains from cattle and wildlife hosts from South Africa and indicate the utility ofmsp1aSas a genotypic marker forA. marginalesubsp.centralestrain diversity.


2008 ◽  
Vol 55 (1) ◽  
pp. 1-6 ◽  
Author(s):  
M. Mejia ◽  
A. Medrano ◽  
C. Gonzalez-Rebeles ◽  
O. Mejia

2009 ◽  
Vol 74 (6) ◽  
pp. 425-437 ◽  
Author(s):  
Thomas M. Kaiser ◽  
Juliane Brasch ◽  
Johanna C. Castell ◽  
Ellen Schulz ◽  
Marcus Clauss

2007 ◽  
Vol 50 (5) ◽  
pp. 442-446 ◽  
Author(s):  
G. Pajares ◽  
I. Álvarez ◽  
I. Fernández ◽  
L. Pérez-Pardal ◽  
F. Goyache ◽  
...  

Abstract. Based on the sequences of the bovine amelogenin genes, we have designed a protocol for sexing DNA samples of wild ruminants. Basically the protocol consists on the co-amplification of two specific fragments, one from Y-chromosome and one for the X chromosome, making the use of a PCR control unnecessary. It has been demonstrated to be useful for sex identification in a total of 164 samples belonging to six different wild ruminant species. We propose adding to the census procedure commonly based in faecal groups counting, the faecal sampling and application of the protocol design here, to estimate the sex ratio.


2010 ◽  
Vol 88 (11) ◽  
pp. 1129-1138 ◽  
Author(s):  
Daryl Codron ◽  
Marcus Clauss

We propose a hypothesis for digestive constraints on the browsing and grazing options available to ruminants: that the diet-niche range (maximum and minimum grass intake) of a species is dependent upon its predisposition to stratified rumen contents, based on observations that this characteristic is a critical step towards enhanced fibre digestion and greater fluid throughput. We compare a physiological (heterogeneity of ingesta fluid content) and an anatomical (the intraruminal papillation pattern) measure with dietary evidence for a range of African and temperate species. Both measures are strongly related to the mean percentage of grass in species’ natural diets, as well as to the maximum and minimum levels of grass intake, respectively. The nature of these effects implies a stratification-level threshold, below which a species will not use a grass-based diet, but above which grass consumption can increase exponentially. However, above this threshold, a minimum percentage of grass in the diet is a prerequisite for optimal performance. We argue that this second constraint is crucial, as it depicts how a greater fluid throughput reduces potential for detoxification of plant secondary compounds, and therefore limits the maximum amount of browse a stratifying species will consume.


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