Results 1 to 10 of about 712 (184)

Tandem Administration of Prostaglandin F_2α and Gonadotropin-Releasing Hormone in Beef Heifers and Cows as a Convergent Presynchronization Method in the 7 & 7 Synch Protocol [PDF]

Animals
An experiment was designed to evaluate modifications to the 7 & 7 Synch protocol, with the hypothesis that tandem administration of prostaglandin F2α (PG) and gonadotropin-releasing hormone (GnRH) during the presynchronization portion of the protocol ...
Lucas J. Palcheff, Genevieve M. VanWye, Kimberly R. Ricardo, Kendal L. Green, Franklin J. Even, Samantha R. Roberts, Adella B. Lonas, Christine M. Spinka, Scott E. Poock, Saulo Menegatti Zoca, Jessica N. Drum, Jordan M. Thomas   +11 more
doaj   +4 more sources

Impact of presynchronization and Ovsynch on early postpartum ovarian activity and fertility of dairy cows in Libya [PDF]

Open Veterinary Journal
Background: Reproductive efficiency affects dairy cow profitability. Ovarian function in postpartum has been better understood using ultrasound and hormonal assays.
Najmi M. Mariol, Atef B. Mahdy, Hussein A. Amer, Ali A. Aghwider, Abubakr M. Hazzaa   +4 more
doaj   +3 more sources

Effect of GnRH 7 Days Before Presynchronization With Simultaneous PGF2α and GnRH on Reproductive Outcomes in Holstein Dairy Cows [PDF]

Frontiers in Veterinary Science, 2020
We evaluated if an additional GnRH injection 7 days before pre-synchronization with simultaneous PGF2α and GnRH (PG+G) would improve responses to presynchronization, synchronization, and pregnancy per AI (P/AI).
Andrew M. Hubner, Andrew M. Hubner, Phillip M. G. Peixoto, Joshua Hillesheim, Igor F. Canisso, Igor F. Canisso, Fabio S. Lima, Fabio S. Lima   +7 more
doaj   +3 more sources

Ovarian and Energy Status in Lame Dairy Cows at Puerperium and Their Responsiveness in Protocols for the Synchronization of Ovulation [PDF]

Animals, 2023
The purpose of this study was to assess the ovarian and energy status of multiparous lame dairy cows at the end of puerperium and investigate their responsiveness to estrous synchronization treatment regimens. Initial lameness scoring was performed at 28
Anastasia Praxitelous, Panagiotis D. Katsoulos, Angeliki Tsaousioti, Christos Brozos, Ekaterini K. Theodosiadou, Constantin M. Boscos, Georgios Tsousis   +6 more
doaj   +3 more sources

Reproductive Efficiency of Low-Fertility Dairy Cows Submitted to Presynch-Ovsynch or Double-Ovsynch Scheme for First Service [PDF]

Animals
Reproductive efficiency has a major impact on the profitability of dairy operations. Focusing on improving the reproductive performance of cows with expected reduced fertility is desired; however, further research is needed in this area.
Luis Gustavo Delamanha Mendonça, Kenneth Wronka, Guy Fridkovski, Todd Bilby, Jeffrey Stevenson   +4 more
doaj   +3 more sources

Presynchronization with prostaglandin F2α and gonadotropin-releasing hormone simultaneously improved first-service pregnancy per artificial insemination in lactating Holstein cows compared with Presynch-14 when combined with detection of estrus

Journal of Dairy Science, 2023
: This study aimed to determine the effect of 2 simple breeding strategies combining artificial insemination (AI) after detection of estrus (AIED) and timed AI (TAI) on first-service fertility in lactating Holstein cows.
J.P.N. Martins, T.O. Cunha, W. Martinez, J.S. Schmitt   +3 more
doaj   +2 more sources

Comparison of Gonadotropin-Releasing Hormone versus Estrogen-Based Fixed-Time Artificial Insemination Protocols in Grazing Bos taurus Suckled Beef Cows [PDF]

Animals, 2023
Fixed-timed artificial insemination (FTAI) protocols for beef cattle in South America are primarily based on estradiol esters and intravaginal progesterone-releasing devices (IVPD).
Luis B. Ferré, Julian Jaeschke, Juliana Gatti, Gerardo Baladón, Ezequiel Bellocq, Gustavo Fernández, Ramiro Rearte, Michael E. Kjelland, Marcos G. Colazo, Jordan M. Thomas   +9 more
doaj   +2 more sources

292 Tandem Administration of Prostaglandin F2α and Gonadotropin-Releasing Hormone in Beef Heifers and Cows as a Convergent Presynchronization Method in the 7 & 7 Synch Protocol [PDF]

J Anim Sci, 2023
An experiment was designed to evaluate modifications to the 7 & 7 synch protocol with the hypothesis that tandem administration of prostaglandin F2α (PG) and gonadotropin-releasing hormone (GnRH) during the presynchronization portion of the protocol ...
L. Palcheff, Genevieve M. VanWye, K. Ricardo, Christine M Spinka, S. Poock, Jordan M. Thomas   +5 more
europepmc   +2 more sources

PSXIV-24 Inducing Luteolysis Before Atresia of the First Follicular Wave By Altering the Interval to Prostaglandin F2ɑ Administration After Long-Term Progestin Presynchronization [PDF]

J Anim Sci, 2023
A series of experiments was designed to evaluate treatment schedules for control of the estrous cycle in which luteolysis is induced before atresia of the first follicular wave following a long-term progestin presynchronization treatment in beef ...
Genevieve M. VanWye, Emily G. Smith, Christine M Spinka, Michael F. Smith, M. Lucy, Jordan M. Thomas   +5 more
europepmc   +2 more sources

Effects of extending interval between presynchronization and breeding protocols and prostaglandin F2α administration before breeding protocol on reproductive performance of Holstein dairy cows during summer. [PDF]

Vet Anim Sci
Highlights • Extension in interval between Ovsynch (presynchronization protocol) and Heatsynch (breeding protocol) did not affect size of follicle at GnRH-1.• Extension in interval between Ovsynch and Heatsynch diminished fertility.• PGF2α administration
Baghbanani RH, Mobedi E, Mohieddini AA, Pooladzadeh P, Zarabadipour S, Vojgani M, Gharagozlou F, Akbarinejad V.   +7 more
europepmc   +2 more sources