scholarly journals Short-term progestin estrus synchronization with timed insemination for beef heifers: CIDR vs. MGA

2004 ◽  
pp. 11-12
Author(s):  
A.W. Thompson ◽  
D.R. Eborn ◽  
L.D. Keenan ◽  
David M. Grieger
Keyword(s):  
Estrus Synchronization ◽  
Beef Heifers ◽  
Short Term

Evaluation of split-time artificial insemination following administration of a long or short-term progestin-based estrus synchronization protocol in beef heifers

2019 ◽  
Vol 133 ◽  
pp. 179-186 ◽  
Author(s):  
E.R. Knickmeyer ◽  
J.M. Thomas ◽  
J.W.C. Locke ◽  
R.C. Bonacker ◽  
M.R. Ellersieck ◽  
...  
Keyword(s):  
Artificial Insemination ◽  
Estrus Synchronization ◽  
Beef Heifers ◽  
Short Term ◽  
Split Time ◽  
Synchronization Protocol

Estrus synchronization in beef heifers with progestin-based protocols

2004 ◽  
Vol 62 (8) ◽  
pp. 1518-1528 ◽  
Author(s):  
S.L. Wood-Follis ◽  
F.N. Kojima ◽  
M.C. Lucy ◽  
M.F. Smith ◽  
D.J. Patterson
Keyword(s):  
Estrus Synchronization ◽  
Beef Heifers

scholarly journals Use of GnRH for Synchronization of the Follicular Wave in Assisted Reproductive Technologies in Sheep: A Preliminary Study

Animals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1208
Author(s):  
Aina Año-Perello ◽  
Zurisaday Santos-Jimenez ◽  
Teresa Encinas ◽  
Paula Martinez-Ros ◽  
Antonio Gonzalez-Bulnes
Keyword(s):  
Luteinizing Hormone ◽  
Assisted Reproductive Technologies ◽  
Ovarian Response ◽  
Reproductive Technologies ◽  
Estrus Synchronization ◽  
Short Term ◽  
Follicular Wave ◽  
Preliminary Study ◽  
Cost Efficient ◽  
Set Up

The present study aimed to set up a short-term protocol for synchronization of follicular wave emergence in sheep, concomitant with estrus synchronization, which would improve ovarian response in assisted reproductive technologies. Administration of a single GnRH dose, concomitant with the insertion of a progesterone-loaded CIDR device, caused regression of gonadotrophin-dependent follicles ≥4 mm in all the GnRH-treated sheep and in around 80% of the controls treated only with CIDR (p < 0.05). Similar percentages of ewes lost all follicles (around 70%) or only the largest one (around 30%) in both groups. Hence, 54.1% and 70% of the sheep lost all large follicles and initiated a new follicular wave in the control and GnRH groups, respectively (p < 0.05). The remaining sheep showed follicles that were still not dependent of luteinizing hormone (LH). So, in fact, all the sheep had non-dominant follicles after treatment. In conclusion, a treatment including GnRH at CIDR insertion would offer a time- and cost-efficient protocol for inducing follicular turnover and synchronizing a new follicular wave at any stage of the estrous cycle.

scholarly journals 386 Efficacy of a Second Injection of Prostaglandin F2α in Yearling Beef Heifers Following Previous Estrus Synchronization.

2018 ◽  
Vol 96 (suppl_2) ◽  
pp. 207-208
Author(s):  
M Erickson ◽  
K C Ramsay ◽  
R N Funston
Keyword(s):  
Prostaglandin F2α ◽  
Estrus Synchronization ◽  
Beef Heifers

158 Effects of an AI plastic sheath with three semen outputs on AI pregnancy rates of beef heifers enrolled in estrus synchronization protocols

2017 ◽  
Vol 95 (suppl_4) ◽  
pp. 77-78
Author(s):  
C. L. Timlin ◽  
N. W. Dias ◽  
J. F. Currin ◽  
S. Clark ◽  
V. R. G. Mercadante
Keyword(s):  
Pregnancy Rates ◽  
Estrus Synchronization ◽  
Beef Heifers

THE USE OF PROSTAGLANDIN F2α IN NATURALLY BRED BEEF HEIFERS

1988 ◽  
Vol 68 (4) ◽  
pp. 1301-1304 ◽  
Author(s):  
R. D. H. COHEN ◽  
B. D. KING ◽  
E. D. JANZEN
Keyword(s):  
Key Words ◽  
Prostaglandin F2α ◽  
Estrus Synchronization ◽  
Beef Heifers ◽  
Conception Rates ◽  
Prostaglandin F ◽  
Natural Breeding

Heifers injected with prostaglandin F2α had significantly higher pregnancy and conception rates within 11 d of start of breeding than noninjected heifers; 56.9 vs. 45.5 pregnancy as a percent of heifers exposed (P < 0.05) and 74.1 vs. 58.2 conception as a percent of pregnant heifers (P < 0.005). Data were pooled for 422 heifers over 5 yr. However, there were no significant effects on calving distribution or weaning weights of their calves. Key words: Prostaglandin F2α, natural breeding, heifer, estrus synchronization

Effect of short-term beta-adrenergic agonist administration along with progestin estrus synchronization on estrous behavior, reproductive performance and ovarian structures of Rambouillet ewes

2018 ◽  
Vol 169 ◽  
pp. 81-85
Author(s):  
Marco A. López-Carlos ◽  
Jairo I. Aguilera-Soto ◽  
Fabiola Méndez-Llorente ◽  
Roque G. Ramírez ◽  
Heriberto Rodríguez ◽  
...  
Keyword(s):  
Reproductive Performance ◽  
Estrus Synchronization ◽  
Adrenergic Agonist ◽  
Short Term ◽  
Beta Adrenergic ◽  
Beta Adrenergic Agonist ◽  
Estrous Behavior

scholarly journals PSXIII-12 Evaluation of split-time artificial insemination following administration of the 7-d CO-Synch + CIDR® estrus synchronization protocol in beef heifers

2019 ◽  
Vol 97 (Supplement_3) ◽  
pp. 374-374
Author(s):  
Emma R Knickmeyer ◽  
Jordan M Thomas ◽  
James William C Locke ◽  
Rachael C Bonacker ◽  
Mark R Ellersieck ◽  
...  
Keyword(s):  
Artificial Insemination ◽  
Reproductive Tract ◽  
Fixed Time ◽  
Pregnancy Rates ◽  
Estrus Synchronization ◽  
Beef Heifers ◽  
Estrus Detection ◽  
Delayed Time ◽  
Split Time ◽  
Synchronization Protocol

Abstract Estrous response and pregnancy rates resulting from fixed-time (FTAI) or split-time (STAI) artificial insemination were compared among heifers following treatment with the 7-d CO-Synch + CIDR® (controlled internal drug release;1.38g progesterone) protocol. Heifers (n = 456) were assigned to balanced treatments based on weight and reproductive tract score (RTS; Scale 1–5). Gonadotropin-releasing hormone (GnRH; 100 µg gonadorelin acetate) was administered coincident with CIDR® insertion. Progesterone inserts were removed after 7 d, and PG (250 mg im cloprostenol sodium) was administered at CIDR® removal. Estrus detection aids (Estrotect®) were applied at the time PG was administered. Estrous status was recorded at FTAI or STAI, and estrus was defined as removal of ≥ 50% of the grey coating from the Estrotect® patch. Heifers assigned to the FTAI treatment received GnRH and were artificially inseminated 54 h after PG administration. In the STAI treatment, only heifers that expressed estrus prior to 54 h were artificially inseminated at that time. For heifers failing to express estrus, AI was postponed 24 h and only those heifers that failed to exhibit estrus by the delayed time (78 h) received GnRH concurrent with AI. Estrous response prior to the standard time of FTAI did not differ between treatments (P = 0.3). Total estrous response was increased (P &lt; 0.001) among heifers assigned to STAI (74%, STAI; 47%, FTAI); however, pregnancy rates resulting from AI were similar between treatments (48%, STAI; 46%, FTAI; P = 0.4), as were pregnancy rates at the end of a 60 d breeding season (P = 0.6). In summary, STAI resulted in a greater estrous response following treatment with the 7-d CO-Synch + CIDR® protocol; however, this did not result in an increase in pregnancy rate compared to heifers that received FTAI.

Comparison of Melengestrol Acetate-Prostaglandin F2α to Syncro-Mate B for estrus synchronization in beef heifers

1988 ◽  
Vol 30 (1) ◽  
pp. 1-12 ◽  
Author(s):  
L.N. Brown ◽  
K.G. Odde ◽  
M.E. King ◽  
D.G. LeFever ◽  
C.J. Neubauer
Keyword(s):  
Prostaglandin F2α ◽  
Estrus Synchronization ◽  
Beef Heifers ◽  
Melengestrol Acetate
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