Burk Dehority
In memory of

Burk Dehority
The Ohio State University | OSU · Department of Animal Sciences

About

300
Publications
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7,183
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Additional affiliations
January 1959 - present
The Ohio State University
Position
  • Professor Emeritus

Publications

Publications (300)
Article
This article is dedicated to the Author, Burk Dehority, who became very ill with cancer. Fortunately he confirmed or corrected all identifications on ciliates in this article. This paper was 80% finished when he became ill. He unfortunately passed away in February 2016. This article would like to list all the ciliates and their counts of miscellane...
Article
Full-text available
Rumen contents were collected from ten adult female blesbok, five from a mine area with only acid drinking water available and five from a control group consuming normal, non-polluted drinking water. The mean concentration of total protozoa in the normal water group was almost double that in the acid drinking water group, 24.9 x 10(3) versus 14.7 x...
Article
Full-text available
The development of high-throughput methods such as the construction of 18S rRNA gene clone or pyrosequencing libraries has allowed evaluation of ciliate community composition in hundreds of samples from the rumen and other intestinal habitats. However, several genera of mammalian intestinal ciliates have been described based only on morphological f...
Article
The methods used for culturing rumen protozoa were found to be unsatisfactory for growth of ciliate protozoa from the kangaroo forestomach. Based on published measurements of physical parameters in the marsupial forestomach, several modifications were incorporated into the procedure, i.e., an increase in % hydrogen in the gas phase, adjustment of i...
Article
Samples of rumen contents were obtained from 10 African (Cape) buffalo living in the vicinity of the Orpen Gate entrance into Kruger National Park in South Africa. Total number of ciliate protozoa per animal ranged from 3.15 to 23.25 x 10<sup>3</sup>. Forty three different species and forms were observed, of which 35 are a new host record. The tota...
Data
##Assembly-Data-START## Assembly Method :: ContigExpress v. 11.1.0.0 Sequencing Technology :: Sanger dideoxy sequencing ##Assembly-Data-END##
Data
##Assembly-Data-START## Assembly Method :: ContigExpress v. 11.1.0.0 Sequencing Technology :: Sanger dideoxy sequencing ##Assembly-Data-END##
Data
##Assembly-Data-START## Assembly Method :: ContigExpress v. 11.1.0.0 Sequencing Technology :: Sanger dideoxy sequencing ##Assembly-Data-END##
Article
Full-text available
Information available on the role of Mg for growth and cellulose degradation by rumen bacteria is both limited and inconsistent. In this study, the Mg requirements for two strains each of the cellulolytic rumen species Fibrobacter succinogenes (A3c and S85), Ruminococcus albus (7 and 8) and Ruminococcus flavefaciens (B34b and C94) were investigated...
Article
The mechanisms by which ruminal protozoa sense and migrate toward nutrients are not fully understood. Chemotaxis by many diverse eukaryotic cells is mediated by phosphatidylinositol-3-kinase, which is highly conserved in receptor tyrosine kinase (RTK) signaling pathways and consistently inhibited by wortmannin. In experiment 1a, increasing the conc...
Article
In contrast to the well-characterized chemotaxis and migratory behavior between the dorsal and ventral locations of the rumen by isotrichids, we hypothesized that chemotaxis toward soluble nutrients maintains entodiniomorphid protozoa in the particulate fraction. The objectives of these experiments were to compare the dose-responsive chemotaxis (1)...
Article
In the course of examining the rumen contents obtained from 25 domestic cattle (Bos taurus taurus) in the vicinity of Kastamonu, Turkey, several new morphotypes of Entodinium dalli Dehority, 1974 were identified. The new morphotypes of this species, E. dalli m. monospinatum n.m. and E. dalli m. triangulabatum n.m. were identified on the basis of di...
Article
Rumen contents from four blue wildebeest (Connochaetes taurinus) and six black wildebeest (Connochaetes gnou) were collected from two locations during two winter culling seasons. A total of 16 species of protozoa were found in blue wildebeest with Dasytricha ruminantium, Opisthotrichum janus and Ostracodinium gracile occurring in all four animals....
Article
Full-text available
The warthog (Phacochoerus aethiopicus) is a grazer and hindgut fermenter with an apparent unique population of protozoa; however, only a limited number of specimens have been studied to date. In addition to having a very low number of protozoal species, little is known about temporal (seasonal) variation and geographic variation in protozoan divers...
Article
Full-text available
The warthog (Phacochoerus aethiopicus) is a grazer and hindgut fermenter with an apparent unique population of protozoa; however, only a limited number of specimens have been studied to date. In addition to having a very low number of protozoal species, little is known about temporal (seasonal) variation and geographic variation in protozoan divers...
Article
Full-text available
Th e species composition and distribution of large intestinal ciliates was investigated in feces from 5 Cypriot domestic horses living in Northern Cyprus. We identifi ed 9 ciliate genera and 11 species. Th is is the fi rst report on intestinal ciliates in Cypriot domestic horses, and no endemic species were observed. Th e genera Cycloposthium, Spir...
Article
Full-text available
Protozoa species were identified in rumen contents of four domestic sheep (Ovis aries) from South Africa. All animals were fed a forage diet which consisted of 50% lucerne and 50% teff hay. Ten new host records were identified, bringing the total number of species and forms observed in sheep in South Africa to 30. The occurrence and geographic dist...
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Intestinal contents were collected from eight impala at three different localities during the winter hunting season (2005-2009), as well as from another 24 animals from a one-year trial at a game farm called Ditholo (2003-2004). Gas production, protozoa counts and several other physiological parameters were measured from both rumen and caecum or co...
Article
External resistance affects the performance of microbial fuel cells (MFCs) by controlling the flow of electrons from the anode to the cathode. The purpose of this study was to determine the effect of external resistance on bacterial diversity and metabolism in MFCs. Four external resistances (20, 249, 480, and 1000 Ω) were tested by operating paral...
Article
When fed equal amounts of substrate, two Epidinium caudatum clone cultures of markedly different size produced similar volumes of microbial protoplasm. Addition of up to 50% volume of 72h culture medium had no inhibitory effects on growth of Epidinium. Two clone cultures of Epidinium caudatum from Australia had longer generation times and showed le...
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Full-text available
In order to study the effect of pH on defaunation in the rumen, four rumen fistulated steers were fed a basal roughage diet for a 4-week adaptation period followed by 17 weeks of feeding with three diets and two feeding levels of high concentrate diet. Rumen outflow fluid rate was evaluated in both ration levels. Rumen protozoa population was monit...
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Full-text available
Seventeen warthogs were harvested from their natural habitat during the winter hunting seasons of May to July 2001 and May to June 2002. Samples (200ml each) were collected and weighed from the stomach, cecum and colon of each animal for protozoal counts. Telamodinium onyx was the only protozoa present in seven animals and the predominant species i...
Article
Ionized calcium (Ca(+2)) appears to be required by the 3 predominant species of rumen cellulolytic bacteria, Fibrobacter succinogenes, Ruminococcus flavefaciens, and Ruminococcus albus. The present study evaluated the role of ionized calcium in growth and cellulose digestion. Maximum growth or rate and extent of digestion and lag time were the crit...
Article
Rumen protozoal diversity in the Spanish ibex (SI) was studied in males (n = 4), females (n = 7) and young (n = 4) from the Maestrazgo (Spain) and contrasted with domestic goats (n = 3; DG) of the same region. There were no differences among SI types in protozoal concentration or in the number of protozoal species. Only protozoa from the genus Ento...
Article
Effects of various zinc (Zn) concentrations on cellulose digestion and cellulolytic and total bacterial numbers were studied in vitro. All fermentation tubes were inoculated with a 1:10 dilution of whole rumen contents and used either 0.0075 or 0.015g/ml purified cellulose as substrate. When Zn was added at six different concentrations: 5, 10, 15,...
Article
Defaunation studies have documented decreased ammonia concentrations associated with reduced microbial protein recycling and wastage of dietary protein, whereas many methods to suppress protozoa can reduce feed intake or depress ruminal organic matter or fiber digestibility. Therefore, more research is needed to optimize dietary conditions that imp...
Article
To maintain stock cultures of rumen protozoa, studies were initiated to explore possible methods for keeping the protozoa viable without feeding every day. Cultures of Entodinium caudatum, Epidinium caudatum, Enoploplastron triloricatum, and Entodinium exiguum were used to study the effect of not feeding for 1 or 2 d. The study lasted 88 d, and alt...
Article
With no acceptable method for collecting fresh rumen fluid from zoo ruminants, it was proposed that fecal bacterial concentrations may be correlated with rumen bacteria. If so, fecal bacterial concentrations could be used to study both the effects of diet on rumen bacteria as well as rumen abnormalities. Total and cellulolytic bacterial concentrati...
Article
In microbial fuel cells (MFCs) bacteria generate electricity by mediating the oxidation of organic compounds and transferring the resulting electrons to an anode electrode. The objective of this study was to test the possibility of generating electricity with rumen microorganisms as biocatalysts and cellulose as the electron donor in two-compartmen...
Article
Rumen contents were obtained from 23 white-tailed deer (Odocoileus virginianus), located in the eastern portion of central Ohio. Samples were taken during late fall and winter over a 4-yr period, 1986–1990. Protozoan numbers ranged from 0.002 to 7.25 × 106 per ml of rumen contents, with a mean of 2.96 × 106. Six deer had protozoan concentrations hi...
Article
Samples of rumen contents were obtained from 13 musk-oxen living on Banks Island, N.W.T., Canada. Total protozoan numbers ranged from 38.5 to 124.6 times 104 per ml of rumen contents with a mean generic distribution of 52.4%Entodinium, 45.9%Diplodinium, and 1.7%Epidinium. A total of 18 protozoan species were found, six of which have not previously...
Article
SYNOPSIS. Six protozoa-free sheep, 3 fed alfalfa hay and 3 fed a concentrate diet, were inoculated with rumen contents from a steer fed the same alfalfa hay. All 24 species of protozoa in the inoculum became established in the sheep fed alfalfa hay, while only 9 species established in the sheep fed concentrate. Percentage species composition in the...
Article
SYNOPSIS. Diplodinium (Ostracodinium) minorum sp. n., observed in rumen contents from several domestic sheep, resembles Diplodinium (O.) ypsilon and Diplodinium (O.) magnum. It differs from the latter 2 species primarily in the size and proportions of the body, size of the rectum and anus, and in the presence of a short right caudal lobe in many in...
Article
Full-text available
Concentration and percentage generic and species composition were determined in rumen contents from five cows, five sheep, two goats and five reindeer living in Iceland. In general, total concentrations of ciliated protozoa in all species were similar to previously reported values. Concentrations of total protozoa ranged between 5.2 × 104 and 44.5...