Effects of Fat Supplementatioin on Reproductive Parameters of Beef Heifers Fed Endophyte-infected Fescue Seed PDF Download

Author: Justin Drew Rhinehart
Publisher:
ISBN:
Category : Cattle
Languages : en
Pages :

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Author: William David Hazlett
Publisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 102

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Author: Brandon Jermaine McClenton
Publisher:
ISBN:
Category :
Languages : en
Pages : 98

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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

Author: Melissa Ann Edwards
Publisher:
ISBN:
Category :
Languages : en
Pages : 64

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Livestock grazing endophyte-infected tall fescue can have decreased performance due to vasoconstriction and reduced reproductive performance. Therefore, the objective of this study was to determine the effect of supplementing rumen-protected arginine to cows consuming endophyte-infected tall fescue seed on caudal blood flow and LH dynamics. Four ruminally cannulated, open beef cows (539 ± 30 kg) were used in a 2 x 2 factorial arrangement of treatments utilizing a Latin Square design with 4 periods of 31 d each. Each cow was assigned to individual pens and fed orchardgrass hay (10.3% CP and 85% NDF; OM basis) during a 10-d adaptation period, followed by a 21-d collection period in which each cow was assigned one of 4 treatments: (1) rumen-protected ARG (180 mg/kg of BW) and 1.0 kg/d of endophyte-infected fescue seed (AE+); (2) rumen-protected ARG (180 mg/kg of BW) and 1.0 kg/d of non-infected fescue seed (AE-); (3) 1.0 kg/d of endophyte-infected fescue seed (E+) alone; or (4) 1.0 kg/d of non-infected fescue seed (E-) alone. In each period, doppler ultrasound measurements for blood flow parameters were quantified on d 1, 5, 10, 15, and 19. On d 20 of each period, blood samples were collected every 10 min for 6 h and then once every hour for 12 h. Caudal blood flow exhibited an interaction (P = 0.05) of ARG × fescue seed type, resulting from an increase in blood flow in cows fed rumen-protected ARG. In addition, mean velocity was greater (P = 0.01) with the inclusion of rumen-protected ARG in the diet. Caudal artery area (P = 0.03) and diameter (P = 0.01) were decreased in cows consuming E+ compared to E- with no effect (P ≥ 0.38) by ARG supplementation. Mean serum LH concentration exhibited (P = 0.02) an ARG × fescue seed type interaction. Cows consuming E+ had decreased LH concentrations compared to all other treatments. However, cows consuming AE+ had similar LH concentrations compared to cows consuming AE- or E-. Thus, supplementing rumen-protected ARG to cows grazing endophyte-infected fescue seed has the potential to increase reproductive performance and peripheral blood flow.

Author: Charles Elmer Mays
Publisher:
ISBN:
Category : Cattle
Languages : en
Pages : 116

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Author: Bradford P. Smith
Publisher: Elsevier Health Sciences
ISBN: 032355444X
Category : Medical
Languages : en
Pages : 2279

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**Selected for Doody’s Core Titles® 2024 with "Essential Purchase" designation in Veterinary Medicine** Utilize a problem-oriented approach to the diagnosis of diseases of horses, cattle, sheep, and goats. Large Animal Internal Medicine, 6th Edition covers the diagnosis and management of disease in both ruminant and equine internal medicine. As the first veterinary internal medicine text to use a problem-based approach, it offers discussions of over 150 clinical signs and manifestations, as well as comprehensive coverage of laboratory and diagnostic testing. New to this edition is a versatile online reference platform and coverage of conditions that exist in Europe, Central and South America, Australia, and New Zealand. In addition, thoroughly revised and updated content includes new vaccines and vaccination protocols; the most current laboratories for DNA, genetic, and PCR testing; and colostrum supplements and replacers. It’s everything you need to stay up to date with the latest information on preventing and treating disease in large animals. Discussions of over 150 clinical signs or manifestations of disease provide you with a problem-based approach to diagnosis based on what you’ve observed and what laboratory tests reveal. Causes of Presenting Signs boxes offer quick access to the common, less common, and uncommon diseases associated with manifestations or signs of disease. Causes of Abnormal Laboratory Values boxes highlight the possible interpretations of abnormalities in clinical chemistry, hematology, blood proteins, and clotting tests. More than 200 expert authors contribute information in their areas of expertise for the most current, authoritative information on each topic. NEW! Expert Consult platform provides a versatile digital resource including bonus content, useful references, and videos to meet the needs of practicing equine and large animal veterinarians. NEW! Global conditions of importance are covered, including those previously not discussed, that exist in Europe, Central and South America, Australia, and New Zealand. NEW! Coverage of emerging and re-emerging diseases includes the new pathogen discovery. NEW! Assessment of vaccination status and susceptibility to infection discusses how antibody titers can predict protection for some pathogens. NEW! Description of epigenetics and metagenomics provides detailed coverage of these emerging areas of interest. NEW! Table of zoonoses obtained from large animals includes symptoms and disinfection needs. NEW! Videos demonstrate how to perform ultrasound imaging on an equine and cow abdomen clearly showing where to position the probe, and what depth to use for scans of the kidneys, liver, and bowel. NEW! Coverage of genetic disorders, Hydrocephalus in Fresians and Pulmonary hypoplasia with Anasarca in Dexter cattle help you to treat these disorders. NEW! Extensively updated content clarifies the latest research and clinical findings on the West Nile Virus, therapeutic drug monitoring, muscle disorders, GI microbiota, the genetic basis for Immune-mediated myositis in Quarter Horses, discoveries in antimicrobial drugs, anthelmintic, and vaccines, and more!

Author: Kammy Ravae Johnson
Publisher:
ISBN:
Category :
Languages : en
Pages : 178

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Author: Alex Santos
Publisher:
ISBN:
Category : Beef cattle
Languages : en
Pages :

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The purpose of these studies was to evaluate the effects of a dietary fat supplementation on growth, reproduction and performance characteristics of replacement beef heifers reared in different management systems (pasture and dry lot conditions). The objectives were (1) to quantify changes in body composition traits and growth performance of replacement beef heifers fed different levels of fat in the supplemented diet, (2) to determine the reproductive performance of heifers supplemented with dietary fat in either a ryegrass pasture system or a dry lot system, and (3) to determine the value of real-time ultrasound technology (RTU) as an alternative technology to assist producers in the decision making process within replacement beef heifer programs. Over the three year study, we observed that both high (3 - 5%) and low (1.5 - 2.5%)levels of dietary fat supplementation of replacement heifers did not have a negative affect in reproductive performance and body composition traits significantly, compared to controls (pasture-base, no supplementation. However, a positive response with respect to some body composition traits was observed in animals fed the higher level of dietary fat in 2004 and 2005 studies. Overall, growth of animals grazing ryegrass outperformed animals supplemented with dietary fat in a dry lot system; yet when dietary fat supplementation was integrated with a ryegrass pasture system, besides the positive effects in body composition traits metabolic changes in relevant reproduction hormones were observed with the addition of dietary fat treatment. Finally, the use of information on body composition traits of replacement beef heifers through the use of real-time ultrasound technology in the decision-making process resulted in a small financial return in these studies. However, the use of this alternative technology in a replacement beef heifer program may have additional value beyond the limited feeding periods reported here. These may include, a greater ability to predict heifer fertility as linked to growth and developmental characteristics (e.g., body composition traits), yet this requires further study.

Author: Alexander John Holtcamp
Publisher:
ISBN:
Category :
Languages : en
Pages : 83

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The objective of this study was to determine the effects of feeding endophyteinfected tall fescue seed to Angus steers during the stocker phase on beef shelf life. Endophyte-infected tall fescue seed had no effect on pH, TBARS, activity of superoxide dismutase and metmyoglobin reductases, and sensory attributes of strip loin steaks or patties (P ≥ 0.082). However, E+ patties had 0.5% more DMb (P = 0.017) and 27% greater redness (a*) on d 5 of display (P

Author: Gail M. Oss
Publisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 140

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