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Showing 1 to 19 of 19 for “"fescue toxicosis"”.
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Genetic variation of susceptibility to fescue toxicosis in cattle
… of two sires were fed endophyte infected (E + ) fescue seed to quantify differences in susceptibility to fescue toxicosis among sire groups. One of the sires, a Polled Hereford, had a commercial reputation of producing calves with less severe symptoms of tall fescue toxicosis than their …
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Effects of fescue toxicosis and chronic heat stress on murine hepatic gene expression
Fescue toxicosis affects domestic animals grazing fescue pasture infected with the endophytic fungus, Neotyphodium coenophialum. Signs of fescue toxicosis include increased body temperature and respiration rate and decreased milk yield and reproductive performance. Laboratory mice also exhibit …
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Pentobarbital Sleep Time in Mouse Lines Selected for Resistance and Susceptibility to Fescue Toxicosis
… for resistance (R) and susceptibility (S) to fescue toxicosis, R mice had higher activities of Phase II liver enzymes glutathione S-transferase and uridine diphosphate glucuronosyl-transferase than S mice. Objectives of this study were: 1. to determine whether selection for toxicosis response …
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Reproduction and Enzyme Detoxification Activities in Mouse Lines Selected for Response to Fescue Toxicosis
… for resistance (R) or for susceptibility (S) to fescue toxicosis based upon reductions in post-weaning growth rate caused by an endophyte-infected diet. The first objective of the current experiment was to determine whether long term reproduction of S mice was more severely depressed than that of …
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Effects of heat stress and fescue toxicosis on the immune system and other physiological parameters
Tall fescue is widely used as pasture grass in the United States, and is the most important cool season grass for grazing animals. Certain fungi also grow on these grasses which produce toxins, resulting in reduced feed intake (FI), body weight (BW) and a compromised thermoregulatory system when …
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Influence of Acremonium coenophialum on Festuca arundinacea growth, chemical composition, digestibility and tall fescue toxicosis
Infection of tall fescue (<i>Festuca arundinacea</> Schreb.) with the endophyte fungus (<i>Acremonium coenophialum</i>, Morgan-Jones and Gam) has been associated with toxicity symptoms observed in cattle. The overall objective was to investigate the influence of endophyte infection on growth and …
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Induction of anti-ergotamine antibodies in mice and steers and protection against fescue toxicosis in mice
Tall fescue (Festuca arundinacea Schreb.) is often infected by the endophytic fungus, Acremonium coenophialum (Morgan-Jones and Gams) The fungus produces ergo peptide alkaloids, especially ergovaline. Consumption of endophyte-infected (ED fescue forage by cattle decreases serum prolactin and …
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The Effect of Three Fescue Types and Lakota Prairie Grass on Copper Status, Dry Matter Intake, and Alkaloid Appearance of Beef Steers
Tall fescue [Schedonorus arundinaceus (Schreb.) Dumort.] is an important forage crop in the United States and covers over 14 million ha. The presence of Neotyphodium coenophialum, an endophytic fungus in tall fescue, is associated with several disorders in grazing livestock, but also increased …
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Influence of endophyte infection of tall fescue with and without white clover on performance, intake, and bite size in steers during the grazing season and subsequent performance in the feedlot
… Morgan-Jones and Gams) infection of tall fescue (Festuca arundinacea Schreb.) on grazing cattle and subsequent feedlot performance, serum minerals and prolactin, intake, digestibility, bite size, and biting rate. Grazing animal performance was measured April to October, 1989 and 1990, at …
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Nutritional strategies for growing cattle in the Southeastern United States
… solutions to cope with the negative effects of fescue toxicosis that are common in the region. Therefore, the objectives of this dissertation are to examine supplementation strategies specific to growing cattle as well as to investigate methods of reducing ergot alkaloid intake. Corn gluten feed …
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Assessing Hepatic Gene Expression in Response to Xenobiotic Exposure in Mice
… considered were ergotamine, associated with fescue toxicosis, and sulforaphane, a phase II inducer. Hypothesized responses in liver gene expression and enzyme activity due to exposure to these xenobiotics were tested. Polymorphic mice were gavaged with sulforaphane, ergotamine or control over …
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Grazing Behavior of Beef Steers Grazing Endophyte-Infected, Endophyte-Free, and Novel Endophyte Infected Tall Fescue, and Lakota Prairie Grass
Endophyte infected Tall fescue (Festuca arundinacea Schreb.) is the most dominant grass used for pasture in the Southeastern U.S. As a result, fescue toxicosis is a major concern. Producers need alternative forages for grazing cattle that do not have this negative aspect. The objective of this …
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Assessment of redox markers in cattle
… heifers were used to assess the impact of fescue toxicosis and heat stress on selected markers in study 1. Intravaginal temperatures, ADG, serum prolactin, plasma malondialdehyde, and whole blood Se, along with peripheral blood mononuclear cell glutathione peroxidase, glutathione reductase, …
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Behavior and Physiological Responses of Livestock Under Different Grazing Systems
… The presence of toxic alkaloids within tall fescue (Schedonorus phoenix syn Lolium arundinaceum, syn Festuca arundinacea) plants induces a complex of disorders collectively known as fescue toxicosis. Summer slump, a reduction in animal performance due to heat stress, is common and evident of …
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The effects of extended-release eprinomectin on heifer performance and fescue toxicity and an evaluation of parasite resistance
… to be beneficial at reducing negative impacts of fescue toxicity. Previous work has shown improvements in growth performance of growing animals when treated with either ivermectin or extended-release eprinomectin. No work has determined the mechanism for this improvement though. The objective of …
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Physiological and immune responses to endophyte-infected tall fescue exposure in beef heifers: impacts on performance, metabolism, and immune cell transcriptomics
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-08-01
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Microbiome Metabolism in the Rumen of Bovine Grazing Toxic Tall Fescue and in Stored Dairy Manure
… grazing nontoxic MaxQ and toxic KY-31 tall fescue pasture, to understand how these cultivars shape the rumen microbiome and identify microbial species potentially capable of degrading ergot alkaloids for better feed utilization. We found that KY-31 grazing remodeled the rumen microbiome …
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Effects of fescue cultivar on performance of beef cows grazed on summer stockpiled tall fescue pastures
… of wild-type, endophyte-infected tall fescue (E+) and novel endophyte-infected tall fescue (NE) summer stockpiled (SS) pastures and the performance of fall-calving beef cow/calf pairs stocked on each cultivar. Fescue cultivars used were KY-31 and MaxQ for E+ and NE treatments, …
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Nutrition and management considerations for bulls and breeding females
… development strategy and how it translates to fescue-based production systems. Thus, the objectives of experiment 1 were to evaluate the effect of heifer development system on body weight (BW), body condition score (BCS), fescue toxicosis symptoms, reproductive performance, and subsequent calf …