Author: Kammy Ravae Johnson
Publisher:
ISBN:
Category :
Languages : en
Pages : 178
Book Description
The Effects of Endophyte-infected Tall Fescue and Niacin Supplementation on Selected Endocrine and Production Characteristics of Beef Heifers and Late Lactation Beef Cows
Effects of Feeding Endophyte-infected Tall Fescue Seed on Beef Cattle Performance, Hepatic Enzyme Activity, Lipid Oxidation, Metmyoglobin Reductase Activity, and Mitochondrial Lipid Composition
Author: Brandon Jermaine McClenton
Publisher:
ISBN:
Category :
Languages : en
Pages : 98
Book Description
The objective of this study was to determine the effects of feeding endophyte-infected tall fescue seed to Angus steers on average daily gain, carcass characteristics, ergovaline concentration, lipid oxidation, hepatic enzyme activity, metmyoglobin reductase activity, and mitochondrial lipid composition. Animals were blocked into light, medium, and heavy body weight groups and were randomly assigned to either a KY31 seed treatment (6796 ppb ergovaline; 20 μg/kg BW; E+; n = 6) or a KY32 control ( 100 ppb; E-; n = 6). There was a 2- way treatment × time interaction effect on ADG (P
Publisher:
ISBN:
Category :
Languages : en
Pages : 98
Book Description
The objective of this study was to determine the effects of feeding endophyte-infected tall fescue seed to Angus steers on average daily gain, carcass characteristics, ergovaline concentration, lipid oxidation, hepatic enzyme activity, metmyoglobin reductase activity, and mitochondrial lipid composition. Animals were blocked into light, medium, and heavy body weight groups and were randomly assigned to either a KY31 seed treatment (6796 ppb ergovaline; 20 μg/kg BW; E+; n = 6) or a KY32 control ( 100 ppb; E-; n = 6). There was a 2- way treatment × time interaction effect on ADG (P
Master's Theses Directories
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 496
Book Description
"Education, arts and social sciences, natural and technical sciences in the United States and Canada".
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 496
Book Description
"Education, arts and social sciences, natural and technical sciences in the United States and Canada".
Effect of Consumption of Endophyte-infected Tall Fescue on Embryo Survival in Beef Heifers
Author: Carla Ann Maness
Publisher:
ISBN:
Category : Cattle
Languages : en
Pages : 168
Book Description
Publisher:
ISBN:
Category : Cattle
Languages : en
Pages : 168
Book Description
The Effect of Thiamin Supplementation on the Ingestive Behavior of Beef Cattle Grazing Endophyte-infected and Endophyte-free Tall Fescue and Alfalfa
Author: Leonard M. Lauriault
Publisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 114
Book Description
Publisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 114
Book Description
Evaluation of the Effects of Endophyte-Infected Tall Fescue Consumption on the Pulmonary Arterial Pressure of Beef Cattle
Author: Edwin Benjamin Rajo Gomez
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Effect of Endophyte-infected Tall Fescue on Hepatic Gene Expression in Cattle
Author: Jenny Katherine Bryant
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 181
Book Description
Fescue toxicosis may result from the intake of ergot alkaloids found in endophyteinfected (E+) tall fescue. The liver if the major organ involved in the pathology of fescue toxicosis, as it is the site where the toxic ergot alkaloids are metabolized. A study performed with rats consuming and E+ diet reported increased expression of Phase I detoxification enzymes and a decreased expression of antioxidants, to suggest an increase of cellular oxidative stress. This study was performed to determine if intake of E+ fescue had the same effect on the expression of detoxification enzymes and antioxidants in cattle. A second objective of this study was to examine changes in the hepatic transcriptome that occur when cattle consume E+ fescue. Missouri- (MO; n=10; 513.6±1.3 Kg BW) and Oklahoma- (OK; n=10; 552.8±12.0 Kg BW) derived Angus steers, maintained at 19-22°C (TN) air temperature for 8 days and then maintained at cycling heat stress for an additional 10 days (26°C night Ta; 36°C day Ta:HS). Cattle were fed diets containing either endophyte-free (E-) or E+ seed (30 [microgram] ergovaline/Kg BW/day) and feed intake (FI) was recorded daily. Blood and liver tissue samples were collected during pretreatment followed by blood samples at Day 4, 11, and 17 and liver tissue samples were collected again on Day 7 and 18. Consumption of E+ fescue resulted in significantly reduced (p!0.05) feed intake in both the TN and HS periods when compared to the E- group. There was also a significantly (p!0.05) lower serum prolactin concentration of E+ steers when compared to E- steers in both the TN and HS periods. These results confirm that E+ steers were experiencing the physiological conditions associated with fescue toxicosis. Real-time PCR was performed to determine expression of selected hepatic Phase I detoxification enzymes and specific antioxidant proteins. Illumina deep sequencing was performed on TN samples from selected fescue-naïve OK steers. Tiling of the sequences to a ~23,500 member reference allowed for the quantification of mRNA transcript abundance in each sample. Real-time PCR demonstrated that cattle consuming E+ fescue did not a significant change in the expression of Phase I detoxification enzymes or antioxidants. Illumina transcriptome analysis confirmed that E+ fescue did not have any significant effect on the expression of selected Phase I genes; however, there were 76 genes whose expression was significantly affected by E+ fescue, including a number of genes involved in !-oxidation of fatty acids, oxidative phosphorylation, Phase II detoxification, antioxidant activity and the stress response. Illumina deep sequencing aided in compiling a list of genes, which should undergo further study to identify the nature of their connection to the clinical signs of fescue toxicosis.
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 181
Book Description
Fescue toxicosis may result from the intake of ergot alkaloids found in endophyteinfected (E+) tall fescue. The liver if the major organ involved in the pathology of fescue toxicosis, as it is the site where the toxic ergot alkaloids are metabolized. A study performed with rats consuming and E+ diet reported increased expression of Phase I detoxification enzymes and a decreased expression of antioxidants, to suggest an increase of cellular oxidative stress. This study was performed to determine if intake of E+ fescue had the same effect on the expression of detoxification enzymes and antioxidants in cattle. A second objective of this study was to examine changes in the hepatic transcriptome that occur when cattle consume E+ fescue. Missouri- (MO; n=10; 513.6±1.3 Kg BW) and Oklahoma- (OK; n=10; 552.8±12.0 Kg BW) derived Angus steers, maintained at 19-22°C (TN) air temperature for 8 days and then maintained at cycling heat stress for an additional 10 days (26°C night Ta; 36°C day Ta:HS). Cattle were fed diets containing either endophyte-free (E-) or E+ seed (30 [microgram] ergovaline/Kg BW/day) and feed intake (FI) was recorded daily. Blood and liver tissue samples were collected during pretreatment followed by blood samples at Day 4, 11, and 17 and liver tissue samples were collected again on Day 7 and 18. Consumption of E+ fescue resulted in significantly reduced (p!0.05) feed intake in both the TN and HS periods when compared to the E- group. There was also a significantly (p!0.05) lower serum prolactin concentration of E+ steers when compared to E- steers in both the TN and HS periods. These results confirm that E+ steers were experiencing the physiological conditions associated with fescue toxicosis. Real-time PCR was performed to determine expression of selected hepatic Phase I detoxification enzymes and specific antioxidant proteins. Illumina deep sequencing was performed on TN samples from selected fescue-naïve OK steers. Tiling of the sequences to a ~23,500 member reference allowed for the quantification of mRNA transcript abundance in each sample. Real-time PCR demonstrated that cattle consuming E+ fescue did not a significant change in the expression of Phase I detoxification enzymes or antioxidants. Illumina transcriptome analysis confirmed that E+ fescue did not have any significant effect on the expression of selected Phase I genes; however, there were 76 genes whose expression was significantly affected by E+ fescue, including a number of genes involved in !-oxidation of fatty acids, oxidative phosphorylation, Phase II detoxification, antioxidant activity and the stress response. Illumina deep sequencing aided in compiling a list of genes, which should undergo further study to identify the nature of their connection to the clinical signs of fescue toxicosis.
Effects of Endophyte-infected Tall Fescue Seed and Bromocriptine on Endocrine and Immune Function in Horses
Author: Jessica Marie Hanneman
Publisher:
ISBN:
Category :
Languages : en
Pages : 96
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 96
Book Description
Effects of Endophyte-infected Tall Fescue on Milk Production and Mammary Gland Development in Mice and Reproductive and Lactational Performance in Guinea Pigs and Rats Supplemented with Vitamin E
Author: Laurie Ann Varney
Publisher:
ISBN:
Category : Laboratory animals
Languages : en
Pages : 302
Book Description
Publisher:
ISBN:
Category : Laboratory animals
Languages : en
Pages : 302
Book Description
A Comparison of the Management Strategies Used to Mitigate Or Alleviate the Effects of Endophyte-infected Tall Fescue on Beef Cattle Performance
Author: Jamie Hawley
Publisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 206
Book Description
Publisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 206
Book Description