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Associations Among Beef Cattle Genot...

Page, Ryan James.

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Associations Among Beef Cattle Genotypes, Neospora caninum Infections, and Reproductive Performance.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Associations Among Beef Cattle Genotypes, Neospora caninum Infections, and Reproductive Performance./
Author:	Page, Ryan James.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
Description:	123 p.
Notes:	Source: Dissertations Abstracts International, Volume: 81-12, Section: B.
Contained By:	Dissertations Abstracts International81-12B.
Subject:	Animal sciences. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27959882
ISBN:	9798645499730

Associations Among Beef Cattle Genotypes, Neospora caninum Infections, and Reproductive Performance.
Page, Ryan James.

Associations Among Beef Cattle Genotypes, Neospora caninum Infections, and Reproductive Performance. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 123 p.

Source: Dissertations Abstracts International, Volume: 81-12, Section: B.

Thesis (Ph.D.)--University of Arkansas, 2020.

This item must not be sold to any third party vendors.

Reproductive performance is crucial for sustained financial success in the beef cattle industry. This dissertation includes a population study that quantified the incidence of Neospora caninum infections in the central region of the United States and tested its relationship with reproductive performance in beef cattle. Trial one of that study concluded that 6.9% of open, replacement heifers (n = 1306) tested seropositive. The second trial in that project found that 9.6% of the breeding age females (n = 500) tested were seropositive for Neospora caninum; and that state in which the cattle lived and age impacted (P < 0.05) infection rate. Breed composition, number of farm dogs on the ranch, and use of total mixed rations were not associated (P > 0.1) with seropositive tests. Fewer (P < 0.05) seropositive females were pregnant in Oklahoma, but overall infection rate was not associated (P > 0.1) with non-pregnant females. The second study, tested for a relationship between heat shock protein 70 (Hsp70) genotypes and reproductive characteristics. Blood samples were collected from beef heifers (n = 165) being developed for replacements and Hsp70 genotypes (A1125C, C895D, G1851A, G2033C) were determined using a commercial laboratory (Neogen Corporation; Lincoln, NE). There was an association (P = 0.04) between C895D genotype and the percentage of lymphocytes in circulation. Pelvic area, reproductive tract score, pregnancy rate, and white blood cell concentrations were affected by (P < 0.05) genotype at G2033C. Cows with heterozygous genotype for G2033C had a lower (P = 0.02) pregnancy rate; conversely, those same cows had larger (P = 0.02) PA. No associations were detected between A1125C or G1851A and the traits evaluated. While more research is needed in this area, these projects indicate that identifying Neospora caninum infected cattle and Hsp70 genotypes could be useful tools for selecting beef cattle.

ISBN: 9798645499730Subjects--Topical Terms:

3174829
Animal sciences.
Subjects--Index Terms:

Cattle

Associations Among Beef Cattle Genotypes, Neospora caninum Infections, and Reproductive Performance.
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245 1 0 $a Associations Among Beef Cattle Genotypes, Neospora caninum Infections, and Reproductive Performance.
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300 $a 123 p.
500 $a Source: Dissertations Abstracts International, Volume: 81-12, Section: B.
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506 $a This item must not be sold to any third party vendors.
520 $a Reproductive performance is crucial for sustained financial success in the beef cattle industry. This dissertation includes a population study that quantified the incidence of Neospora caninum infections in the central region of the United States and tested its relationship with reproductive performance in beef cattle. Trial one of that study concluded that 6.9% of open, replacement heifers (n = 1306) tested seropositive. The second trial in that project found that 9.6% of the breeding age females (n = 500) tested were seropositive for Neospora caninum; and that state in which the cattle lived and age impacted (P < 0.05) infection rate. Breed composition, number of farm dogs on the ranch, and use of total mixed rations were not associated (P > 0.1) with seropositive tests. Fewer (P < 0.05) seropositive females were pregnant in Oklahoma, but overall infection rate was not associated (P > 0.1) with non-pregnant females. The second study, tested for a relationship between heat shock protein 70 (Hsp70) genotypes and reproductive characteristics. Blood samples were collected from beef heifers (n = 165) being developed for replacements and Hsp70 genotypes (A1125C, C895D, G1851A, G2033C) were determined using a commercial laboratory (Neogen Corporation; Lincoln, NE). There was an association (P = 0.04) between C895D genotype and the percentage of lymphocytes in circulation. Pelvic area, reproductive tract score, pregnancy rate, and white blood cell concentrations were affected by (P < 0.05) genotype at G2033C. Cows with heterozygous genotype for G2033C had a lower (P = 0.02) pregnancy rate; conversely, those same cows had larger (P = 0.02) PA. No associations were detected between A1125C or G1851A and the traits evaluated. While more research is needed in this area, these projects indicate that identifying Neospora caninum infected cattle and Hsp70 genotypes could be useful tools for selecting beef cattle.
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