A comparison of two estrus synchronization methods in beef heifers

1998 ◽  
Vol 78 (3) ◽  
pp. 437-439
Author(s):  
L. A. Stephens ◽  
R. Rajamahendran
Keyword(s):  
Key Words ◽  
Pregnancy Rate ◽  
Gonadotropin Releasing Hormone ◽  
Estrus Synchronization ◽  
Beef Heifers ◽  
Releasing Hormone ◽  
Prostaglandin F

This study compared the use of two injections of prostaglandin F2α(PGF2α) given 11 d apart with the use of gonadotropin releasing hormone (GnRH) followed by PGF2α after 7 d for synchronizing estrus in beef heifers. Heifers synchronized with GnRH and PGF2α showed weak signs of estrus and were more difficult to inseminate. There were no significant differences in synchronization rate and pregnancy rate. Key words: Estrus synchronization, beef heifers, gonadotropin releasing hormone, prostaglandin F2α

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 norgestomet or norgestomet and gonadotropin-releasing hormone on attainment of puberty in beef heifers

1996 ◽  
Vol 76 (3) ◽  
pp. 477-479 ◽  
Author(s):  
C. L. Henderson ◽  
H. L. Miller
Keyword(s):  
Key Words ◽  
Reproductive Performance ◽  
Hormonal Treatment ◽  
Subsequent Pregnancy ◽  
Gonadotropin Releasing Hormone ◽  
Beef Heifers ◽  
Releasing Hormone

An experiment was conducted using 133 crossbred beef heifers randomly assigned to three treatments. All heifers were bled weekly to monitor concentration of progesterone. Norgestomet-treated heifers were 26.2 d younger (P < 0.01) and 21.6 kg lighter (P < 0.05) than controls at puberty. Norgestomet plus GnRH-treated heifers were 30.9 d younger (P < 0.01) and 18.8 kg lighter (P < 0.05) than controls at puberty. The effects of hormonal treatment on subsequent pregnancy and calving rates were variable. Key words: Beef heifers, puberty, norgestomet, GnRH, reproductive performance

scholarly journals Measures of Estrus Detection and Pregnancy in Dairy Cows After Administration of Gonadotropin-Releasing Hormone Within an Estrus Synchronization Program Based on Prostaglandin F2

1998 ◽  
Vol 81 (2) ◽  
pp. 375-381 ◽  
Author(s):  
Stephen J. LeBlanc ◽  
Ken E. Leslie ◽  
Henry J. Ceelen ◽  
David F. Kelton ◽  
Gregory P. Keefe
Keyword(s):  
Dairy Cows ◽  
Gonadotropin Releasing Hormone ◽  
Estrus Synchronization ◽  
Releasing Hormone ◽  
Estrus Detection

Pregnancy status and feedlot performance of beef heifers actively immunized against gonadotropin-releasing hormone.

1997 ◽  
Vol 75 (5) ◽  
pp. 1185 ◽  
Author(s):  
M Bell ◽  
C A Daley ◽  
S L Berry ◽  
T E Adams
Keyword(s):  
Gonadotropin Releasing Hormone ◽  
Beef Heifers ◽  
Feedlot Performance ◽  
Releasing Hormone ◽  
Pregnancy Status

Gonadotropin-releasing hormone-induced secretion of luteinizing hormone in postpartum beef heifers maintained on two planes of nutrition before and after breeding1

1994 ◽  
Vol 72 (4) ◽  
pp. 998-1003 ◽  
Author(s):  
S. Leers-Sucheta ◽  
P. K. Chakraborty ◽  
K. E. Rowe ◽  
H. A. Turner ◽  
F. Stormshak
Keyword(s):  
Luteinizing Hormone ◽  
Gonadotropin Releasing Hormone ◽  
Beef Heifers ◽  
Releasing Hormone ◽  
Before And After

Can pregnancy rate be improved in gonadotropin-releasing hormone (GnRH) antagonist cycles by administering GnRH agonist before oocyte retrieval? A prospective, randomized study

2008 ◽  
Vol 90 (4) ◽  
pp. 1087-1093 ◽  
Author(s):  
Morey Schachter ◽  
Shevach Friedler ◽  
Raphael Ron-El ◽  
Ariel L. Zimmerman ◽  
Deborah Strassburger ◽  
...  
Keyword(s):  
Pregnancy Rate ◽  
Gnrh Agonist ◽  
Gnrh Antagonist ◽  
Randomized Study ◽  
Oocyte Retrieval ◽  
Gonadotropin Releasing Hormone ◽  
Prospective Randomized Study ◽  
Releasing Hormone
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