The Resource Biological characteristics of Katahdin sheep selected for footrot resistance, by Samaneh Azarpajouh

Biological characteristics of Katahdin sheep selected for footrot resistance, by Samaneh Azarpajouh

Label
Biological characteristics of Katahdin sheep selected for footrot resistance
Title
Biological characteristics of Katahdin sheep selected for footrot resistance
Statement of responsibility
by Samaneh Azarpajouh
Creator
Contributor
Author
Thesis advisor
Subject
Genre
Language
eng
Summary
The objectives of this study were to select sheep divergent for a footrot resistant genotype by screening with the DQA2 gene marker and to investigate the host resistant immune response, neutrophil phagocytic efficiency, and damage caused by pathogenic bacteria in stratum corneum of hoof tissue. Sixty-eight Katahdin and Katahdin x Dorper crossbred ewes were stratified by body weight and footrot gene marker test scores into control (C) and treatment (D) groups. Cultures of D. nodosus were inoculated to the inter-digital skin of the treatment group. White and red blood cell count, packed cell volume, WBC differential, immune response measurements, body weight, body condition scores, and footrot scores were recorded. The protease thermostability of D. nodosus was tested by using a gelatin test. Neutrophil phagocytic efficiency was tested in different marker groups. Damage caused by D. nodosus on white and black hoof tissue samples was observed by an Environmental Scanning Electron Microscope. The data were analyzed by using mixed model procedures of SAS, and P < 0.05 was considered as significant. At the end of trial, C group had a footrot score of 0, but D group had footrot scores of 0 to 2. The IgG level in sera (mg/ml) was greater in D than C groups (P< 0.0001). The neutrophils in high resistant genotypes of sheep had significantly more efficient phagocytic activity vs. low resistant genotypes. Sinus formation was observed in both white and black hoof tissues, but there was no relationship between the tissue pigment and the ultrastractural changes in tissue. The gelatin test determined the enzyme activity of inoculated D. nodosus and since no virulent cases of footrot were observed during footrot pathogenic challenge, it can be used as evidence of footrot resistance in the Katahdin sheep breed
Cataloging source
MUU
http://library.link/vocab/creatorDate
1984-
http://library.link/vocab/creatorName
Azarpajouh, Samaneh
Degree
Ph.D.
Dissertation note
Dissertation
Dissertation year
2014.
Government publication
government publication of a state province territory dependency etc
Granting institution
University of Missouri--Columbia
Illustrations
illustrations
Index
no index present
Literary form
non fiction
Nature of contents
  • dictionaries
  • bibliography
  • theses
http://library.link/vocab/relatedWorkOrContributorName
  • Wuliji, Tumen
  • Lamberson, William R.
Label
Biological characteristics of Katahdin sheep selected for footrot resistance, by Samaneh Azarpajouh
Instantiates
Publication
Note
  • "December 2014."
  • "A Dissertation Presented to the Faculty of the Graduate School at the University of Missouri--Columbia In Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy."
  • Dissertation Supervisors: Dr. Tumen Wuliji and Dr. William R. Lamberson
  • Includes vita
Bibliography note
Includes bibliographical references (pages 87-100)
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier.
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent.
Control code
917603915
Extent
1 online resource (3 files)
Form of item
online
Media category
computer
Media MARC source
rdamedia.
Media type code
  • c
Other physical details
illustrations (some color)
Specific material designation
remote
System control number
(OCoLC)917603915
Label
Biological characteristics of Katahdin sheep selected for footrot resistance, by Samaneh Azarpajouh
Publication
Note
  • "December 2014."
  • "A Dissertation Presented to the Faculty of the Graduate School at the University of Missouri--Columbia In Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy."
  • Dissertation Supervisors: Dr. Tumen Wuliji and Dr. William R. Lamberson
  • Includes vita
Bibliography note
Includes bibliographical references (pages 87-100)
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier.
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent.
Control code
917603915
Extent
1 online resource (3 files)
Form of item
online
Media category
computer
Media MARC source
rdamedia.
Media type code
  • c
Other physical details
illustrations (some color)
Specific material designation
remote
System control number
(OCoLC)917603915

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