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Unlocking the Fertility Potential of High-Producing Dairy Cows: A Novel Approach to Assess Conceptus Attachment and Insights Into Early Pregnancy Detection and Losses /

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Unlocking the Fertility Potential of High-Producing Dairy Cows: A Novel Approach to Assess Conceptus Attachment and Insights Into Early Pregnancy Detection and Losses // Thaina Minela.
Author:	Minela, Thaina,
Description:	1 electronic resource (231 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 85-10, Section: B.
Contained By:	Dissertations Abstracts International85-10B.
Subject:	Animal sciences. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31141651
ISBN:	9798382263250

Unlocking the Fertility Potential of High-Producing Dairy Cows: A Novel Approach to Assess Conceptus Attachment and Insights Into Early Pregnancy Detection and Losses /
Minela, Thaina,

Unlocking the Fertility Potential of High-Producing Dairy Cows: A Novel Approach to Assess Conceptus Attachment and Insights Into Early Pregnancy Detection and Losses /Thaina Minela. - 1 electronic resource (231 pages)

Source: Dissertations Abstracts International, Volume: 85-10, Section: B.

Artificial insemination (AI) following a detected estrus results in decreased fertility when compared to hormone-based fertility programs. It is unclear at what stage of gestation pregnancy failure occurs and why it occurs in a greater proportion following AI to a detected estrus. The objective of the present dissertation was to investigate the current fertility potential of high-producing lactating dairy cows. A novel methodology of serial measurements of pregnancy-specific protein B (PSPB) allowed for pregnancy evaluation as soon as day 19 of gestation. Reduced antral age of the pre-ovulatory was associated with greater steroidogenic capacity and more intense estruses. Cows detected in estrus ovulated follicles with greater diameter in comparison to cows synchronized with Double-Ovsynch. Follicle diameter was positively associated with 17β-estradiol to progesterone (E2 to P4) ratio, but the ratio was not a predictor of conceptus attachment in estrus cows. Cows that received AI to a detected estrus had decreased fertility at conceptus attachment and pregnancy diagnosis performed between days 31 and 49 post-AI in comparison to Double-Ovsynch. Pregnancy losses occurring prior to this period did not differ between treatments. Hormonal intervention enhanced intrinsic fertility of cows that had at least 2 estrus events detected prior to 1st AI. Induction of accessory corpora lutea post-AI did not improve fertility of cows treated with timed AI programs. The models utilized herein enabled the endocrine, behavioral, and fertility characterization of high-producing dairy cows detected in estrus.

English

ISBN: 9798382263250Subjects--Topical Terms:

1178863
Animal sciences.
Subjects--Index Terms:

Artificial insemination

Unlocking the Fertility Potential of High-Producing Dairy Cows: A Novel Approach to Assess Conceptus Attachment and Insights Into Early Pregnancy Detection and Losses /
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520 $a Artificial insemination (AI) following a detected estrus results in decreased fertility when compared to hormone-based fertility programs. It is unclear at what stage of gestation pregnancy failure occurs and why it occurs in a greater proportion following AI to a detected estrus. The objective of the present dissertation was to investigate the current fertility potential of high-producing lactating dairy cows. A novel methodology of serial measurements of pregnancy-specific protein B (PSPB) allowed for pregnancy evaluation as soon as day 19 of gestation. Reduced antral age of the pre-ovulatory was associated with greater steroidogenic capacity and more intense estruses. Cows detected in estrus ovulated follicles with greater diameter in comparison to cows synchronized with Double-Ovsynch. Follicle diameter was positively associated with 17β-estradiol to progesterone (E2 to P4) ratio, but the ratio was not a predictor of conceptus attachment in estrus cows. Cows that received AI to a detected estrus had decreased fertility at conceptus attachment and pregnancy diagnosis performed between days 31 and 49 post-AI in comparison to Double-Ovsynch. Pregnancy losses occurring prior to this period did not differ between treatments. Hormonal intervention enhanced intrinsic fertility of cows that had at least 2 estrus events detected prior to 1st AI. Induction of accessory corpora lutea post-AI did not improve fertility of cows treated with timed AI programs. The models utilized herein enabled the endocrine, behavioral, and fertility characterization of high-producing dairy cows detected in estrus.
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