Body size and habitat as determinants of tick infestations of wild ungulates in South Africa
The purpose of the present work was to test the hypothesis that the intensity of tick infestation on South African wild ungulates is proportional to surface area of the host (body weight 0.67} and to assess the role of habitat preference on the intensity of infestations. The results support previous suggestions that larger ungulates are […]
Comparison of rumen fluid from South African game species and from sheep to digest tanniniferous browse
The hypothesis that South African game animals that use browse containing condensed tannins (CT) could have rumen microbial populations better able to ferment tanniniferous forages was explored. Rumen fluid (RF) from a range of browsing ruminants was used to ferment tanniniferous forages in vitro and the results were compared with the values obtained with rumen […]
Digestive tract pathology of captive giraffe (Giraffa Camelopardalis). A unifying hypothesis
Captive giraffe (Giraffa Camelopardalis) are affected by four major pathological conditions linked to their nutrition: (1) the so-called “peracute mortality syndrome” with complete absence and serious atrophy of body fat stores, (2) phytobezoars, i.e. Fibrous conglomerates of plant material, in the omasum and abomasums (3) rumen acidosis or (4) partial loss of dorsal ruminal papillation. […]
Overlap and seasonal shifts in use of woody plant species amongst a guild of savanna browsers
To clarify the potential influence of different browsers in the same guild on woody vegetation, dietary overlap and separation between elephant, giraffe, kudu, nyala and impala was assessed in Hluhluwe-iMfolozi Park, South Africa. Woody species browsed, browsing heights, plant-parts browsed and browsing versus grazing were recorded over 2 y by direct observation. We obtained 3068 […]
Differences in Fecal Particle Size Between Free-ranging and Captive Individuals of Two Browser Species
Data from captive animals indicated that browsing (BR) ruminants have larger fecal particles—indicative of lesser chewing efficiency—than grazers (GR). To answer whether this reflects fundamental differences between the animal groups, or different reactions of basically similar organisms to diets fed in captivity, we compared mean fecal particle size (MPS) in a GR and a BR […]
The maximum attainable body size of herbivorous mammals: morphophysiological constraints on foregut, and adaptations of hindgut fermenters
An oft-cited nutritional advantage of large body size is that larger animals have lower relative energy requirements and that, due to their increased gastrointestinal tract (GIT) capacity, they achieve longer ingesta passage rates, which allows them to use forage of lower quality. However, the fermentation of plant material cannot be optimized endlessly; there is a […]
Tooth wear in captive giraffes (Giraffa camelopardalis): Mesowear analysis classifies free-ranging specimens as browsers but captive ones as grazers
Captive giraffe (Giraffa camelopardalis) mostly do not attain the longevity possible for this species and frequently have problems associated with low energy intake and fat storage mobilization. Abnormal tooth wear has been among the causes suggested as an underlying problem. This study utilizes a tooth wear scoring method (“mesowear”) primarily used in paleobiology. This scoring […]