東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

The Impact of Postpartum Hormonal In...

Vlietstra, Robert J.

Linked to FindBook

Google Book

Amazon

博客來

The Impact of Postpartum Hormonal Intervention on Uterine Health and Fertility of Dairy Cows.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The Impact of Postpartum Hormonal Intervention on Uterine Health and Fertility of Dairy Cows./
Author:	Vlietstra, Robert J.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	118 p.
Notes:	Source: Dissertations Abstracts International, Volume: 81-07, Section: B.
Contained By:	Dissertations Abstracts International81-07B.
Subject:	Physiology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27671089
ISBN:	9781392593066

The Impact of Postpartum Hormonal Intervention on Uterine Health and Fertility of Dairy Cows.
Vlietstra, Robert J.

The Impact of Postpartum Hormonal Intervention on Uterine Health and Fertility of Dairy Cows. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 118 p.

Source: Dissertations Abstracts International, Volume: 81-07, Section: B.

Thesis (Ph.D.)--Michigan State University, 2019.

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

This dissertation explores the complex mechanisms involved in the ability of a dairy cow to undergo parturition and then become pregnant once again in less than 3 months. This critical period in a cow's life is when the herd veterinarian spends most of their time ensuring this period is not fraught with problems that may impact the ability for this cow to become pregnant again. The first chapter reviews the importance of both ovarian and uterine physiology during this important period. The physiology of follicular and luteal function changes rapidly from parturition until 1 to 2 months later. Cows will generally have an ovulation and begin estrous cycles from 15 to 45 DIM. But a substantial percentage of cows will not have an ovulation before this time. We refer to these cows as "anovular" because they are not ovulating. Anovulation can be detrimental to the chances of a pregnancy following first AI as pointed out in Chapter 1. In addition, what transpires with regard to ovarian function also can have a direct impact on uterine physiology. In Chapter 2, the literature regarding the problem of endometritis on the health, welfare and chances of a pregnancy is presented. It was clear from this literature review that endometritis increases the time to pregnancy thus increasing the chances of cows leaving the herd too soon. This costs dairy producers a significant amount of money. Chapter 3 proposes a systematic way to solve the two main issues discussed in Chapters 1 and 2 with a hypothesis that utilizing GnRH and PGF2α in tandem could resolve both the anovulatory condition of cows in addition to endometritis. Outcomes were clear that this strategy actually decreased fertility of primiparous lactating cows. The final chapter of this dissertation, Chapter 4, summarized the impact of a fertility program initiated at Rolling Acres Farm in Michigan. The impact of the fertility program, G6G, on a number of outcomes is described.

ISBN: 9781392593066Subjects--Topical Terms:

518431
Physiology.

The Impact of Postpartum Hormonal Intervention on Uterine Health and Fertility of Dairy Cows.
LDR:02974nmm a2200301 4500 001 2264403
005 20200423113038.5
008 220629s2019 ||||||||||||||||| ||eng d
020 $a 9781392593066
035 $a (MiAaPQ)AAI27671089
035 $a AAI27671089
040 $a MiAaPQ $c MiAaPQ
100 1 $a Vlietstra, Robert J. $3 3541523
245 1 4 $a The Impact of Postpartum Hormonal Intervention on Uterine Health and Fertility of Dairy Cows.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2019
300 $a 118 p.
500 $a Source: Dissertations Abstracts International, Volume: 81-07, Section: B.
500 $a Advisor: Pursley, James R;Weber-Nielsen, Miriam.
502 $a Thesis (Ph.D.)--Michigan State University, 2019.
506 $a This item must not be sold to any third party vendors.
520 $a This dissertation explores the complex mechanisms involved in the ability of a dairy cow to undergo parturition and then become pregnant once again in less than 3 months. This critical period in a cow's life is when the herd veterinarian spends most of their time ensuring this period is not fraught with problems that may impact the ability for this cow to become pregnant again. The first chapter reviews the importance of both ovarian and uterine physiology during this important period. The physiology of follicular and luteal function changes rapidly from parturition until 1 to 2 months later. Cows will generally have an ovulation and begin estrous cycles from 15 to 45 DIM. But a substantial percentage of cows will not have an ovulation before this time. We refer to these cows as "anovular" because they are not ovulating. Anovulation can be detrimental to the chances of a pregnancy following first AI as pointed out in Chapter 1. In addition, what transpires with regard to ovarian function also can have a direct impact on uterine physiology. In Chapter 2, the literature regarding the problem of endometritis on the health, welfare and chances of a pregnancy is presented. It was clear from this literature review that endometritis increases the time to pregnancy thus increasing the chances of cows leaving the herd too soon. This costs dairy producers a significant amount of money. Chapter 3 proposes a systematic way to solve the two main issues discussed in Chapters 1 and 2 with a hypothesis that utilizing GnRH and PGF2α in tandem could resolve both the anovulatory condition of cows in addition to endometritis. Outcomes were clear that this strategy actually decreased fertility of primiparous lactating cows. The final chapter of this dissertation, Chapter 4, summarized the impact of a fertility program initiated at Rolling Acres Farm in Michigan. The impact of the fertility program, G6G, on a number of outcomes is described.
590 $a School code: 0128.
650 4 $a Physiology. $3 518431
650 4 $a Animal sciences. $3 3174829
690 $a 0719
690 $a 0475
710 2 $a Michigan State University. $b Animal Science- Doctor of Philosophy. $3 3282935
773 0 $t Dissertations Abstracts International $g 81-07B.
790 $a 0128
791 $a Ph.D.
792 $a 2019
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27671089