scholarly journals Treatment of cystic ovarian disease in dairy cows with gonadotrophin‐releasing hormone: A field study

1999 ◽  
Vol 21 (1) ◽  
pp. 33-37 ◽  
Author(s):  
G.A. Hooijer ◽  
K. Frankena ◽  
M.M.H. Valks ◽  
M. Schuring
Keyword(s):  
Dairy Cows ◽  
Field Study ◽  
Releasing Hormone ◽  
Ovarian Disease ◽  
Gonadotrophin Releasing Hormone ◽  
Cystic Ovarian Disease

Fertility parameters of dairy cows with cystic ovarian disease after treatment with gonadotrophin-releasing hormone

2001 ◽  
Vol 149 (13) ◽  
pp. 383-386 ◽  
Author(s):  
G. A. Hooijer ◽  
M. A. A. J. van Oijen ◽  
K. Frankena ◽  
M. M. H. Valks
Keyword(s):  
Dairy Cows ◽  
Releasing Hormone ◽  
Ovarian Disease ◽  
Gonadotrophin Releasing Hormone ◽  
Cystic Ovarian Disease

Inducing ovulation with oestradiol cypionate allows flexibility in the timing of insemination and removes the need for gonadotrophin-releasing hormone in timed AI protocols for dairy cows

2017 ◽  
Vol 29 (3) ◽  
pp. 468 ◽  
Author(s):  
R. M. Ferreira ◽  
H. Ayres ◽  
L. U. Gimenes ◽  
F. P. Torres ◽  
F. A. Lima ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Pregnancy Rates ◽  
Holstein Cows ◽  
Device Removal ◽  
Releasing Hormone ◽  
Ovulatory Follicle ◽  
Oestradiol Benzoate ◽  
Gonadotrophin Releasing Hormone

The effects of addition of gonadotrophin-releasing hormone (GnRH) to a progesterone plus oestradiol-based protocol and timing of insemination in Holstein cows treated for timed AI (TAI) were evaluated. Cows (n = 481) received a progesterone device and 2 mg oestradiol benzoate. After 8 days, the device was removed and 25 mg dinoprost was administered. Cows were allocated to one of three (Study 1; n = 57) or four (Study 2; n = 424) groups, accordingly to ovulation inducer alone (Study 1; oestradiol cypionate (EC), GnRH or both) or ovulation inducer (EC alone or combined with GnRH) and timing of insemination (48 or 54 h after device removal; Study 2). In Study 1, the diameter of the ovulatory follicle was greater for GnRH than EC. Oestrus and ovulation rates were similar regardless of ovulatory stimuli. However, time to ovulation was delayed when GnRH only was used. In Study 2, cows treated with GnRH or not had similar pregnancy per AI (P/AI) 30 days (41.5% vs 37.3%; P = 0.28) and 60 days (35.9% vs 33.0%; P = 0.61) after TAI. TAI 48 and 54 h after device removal resulted similar P/AI at 30 days (40.3% vs 38.5%; P = 0.63) and 60 days (33.8% vs 35.1%; P = 0.72). Thus, adding GnRH at TAI does not improve pregnancy rates in dairy cows receiving EC. The flexibility of time to insemination enables TAI of a large number of cows using the same protocol and splitting the time of AI.

Insulin resistance: the link between metabolic disorders and cystic ovarian disease in high yielding dairy cows?

1999 ◽  
Vol 56 (3-4) ◽  
pp. 211-222 ◽  
Author(s):  
G. Opsomer ◽  
Th. Wensing ◽  
H. Laevens ◽  
M. Coryn ◽  
A. de Kruif
Keyword(s):  
Insulin Resistance ◽  
Dairy Cows ◽  
Metabolic Disorders ◽  
Ovarian Disease ◽  
Cystic Ovarian Disease

Effect of gonadotrophin-releasing hormone analogue (GnRH-A) administration on serum gonadotrophin and steroid levels in patients with polycystic ovarian disease

1986 ◽  
Vol 111 (2) ◽  
pp. 228-234 ◽  
Author(s):  
Alessandro Mongioi ◽  
Grazia Maugeri ◽  
Maria Macchi ◽  
Aldo Calogero ◽  
Enzo Vicari ◽  
...  
Keyword(s):  
Marked Decrease ◽  
Close Correlation ◽  
Gnrh Analogue ◽  
Hormone Analogue ◽  
Polycystic Ovarian Disease ◽  
Releasing Hormone ◽  
Ovarian Disease ◽  
Serum Lh ◽  
End Of Treatment ◽  
Gonadotrophin Releasing Hormone

Abstract. A gonadotrophin-releasing hormone (GnRH) analogue, D-Ser[TBU]LRH-EA10, (GnRH-A), at a dose of 200 μg was given daily for 2 months to 6 women with polycystic ovarian disease (PCO). Prior to therapy the patients presented elevated LH, testosterone (T), oestrone (E1) and dihydrotestosterone (DHT) in the circulation. In response to GnRH-A, these subjects exhibited a marked decrease in circulating T, DHT and androstenedione (A) levels as measured 24 h after GnRH-A injection, by 4 weeks and onwards (P < 0.05). After 2 weeks of daily administration, the serum LH profile, evaluated by sampling at 2, 4. 7 and 24 h after injection of GnRH-A, was not different from baseline, whereas after 4, 6 and 8 weeks the levels were significantly lower (*P < 0.01). The profile of serum T levels was unmodified at the second week, but significantly decreased thereafter (*P <0.01). At the end of treatment, the E1 concentrations, elevated in pre-injection condition, were markedly decreased. These data demonstrate that in PCO subjects, GnRH-A significantly lowered the elevated levels of androgens commonly found in these patients. The close correlation observed between reduced serum LH and androgen concentrations suggests that pituitary desensitization could be responsible for the reduction in androgen levels, and may be evidence for a gonadotrophin dependence of the elevated concentrations of T in these patients.

Treatment of cystic ovarian disease with Naloxone in high production dairy cows

2008 ◽  
Vol 31 (2) ◽  
pp. 184-186 ◽  
Author(s):  
M. M. PALOMAR ◽  
J. C. ACOSTA ◽  
N. R. SALVETTI ◽  
F. BARBERIS ◽  
P. M. BELDOMENICO ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Ovarian Disease ◽  
High Production ◽  
Cystic Ovarian Disease
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