On the Action of Gonadotropin-Releasing Factor

2015 ◽  
pp. 161-169
Author(s):  
K. Wakabayashi ◽  
B. Tamaoki
Keyword(s):  
Gonadotropin Releasing Factor

Deficiency of gonadotropin-releasing factor in a patient with hydrocephalus internus

1975 ◽  
Vol 43 (2) ◽  
pp. 239-243 ◽  
Author(s):  
Joseph M. Coenegracht ◽  
Jan P. A. M.de Bie ◽  
Louis N. M. Coene ◽  
George Padberg
Keyword(s):  
Luteinizing Hormone ◽  
Primary Amenorrhea ◽  
Cyclic Activity ◽  
Luteinizing Hormone Releasing Hormone ◽  
Content Type ◽  
Releasing Hormone ◽  
Therapeutic Trials ◽  
Gonadotropin Releasing Factor ◽  
Fine Print

✓ The authors present the case of a 21-year-old woman with primary amenorrhea and hydrocephalus internus, and suggest that the amenorrhea was probably caused by insufficient basal and cyclic activity of luteinizing hormone/releasing hormone-producing neurons in the hypothalamus. The amenorrhea persisted after ventriculocisternotomy; only after several therapeutic trials with estrogens and progesteron did spontaneous menstrual periods appear more than 5 years after operation.

Effect of anti-gonadotropin-releasing factor vaccine and band castration on indicators of welfare in beef cattle1,2

2015 ◽  
Vol 93 (4) ◽  
pp. 1581-1591 ◽  
Author(s):  
S. Marti ◽  
M. Devant ◽  
S. Amatayakul-Chantler ◽  
J. A. Jackson ◽  
E. Lopez ◽  
...  
Keyword(s):  
Gonadotropin Releasing Factor

Preliminary study of the effects of an anti-gonadotropin-releasing factor vaccine at two initial liveweights on the carcass traits and meat quality of bulls

2019 ◽  
Vol 59 (8) ◽  
pp. 1462 ◽  
Author(s):  
G. Ripoll ◽  
A. Noya ◽  
I. Casasús ◽  
A. Sanz
Keyword(s):  
Shelf Life ◽  
Meat Quality ◽  
Ageing Time ◽  
Carcass Quality ◽  
Total Meat ◽  
Preliminary Study ◽  
Gonadotropin Releasing Factor ◽  
Intramuscular Fat Content ◽  
Quality And Shelf Life

The aim of this experiment was to study the effect of the Improvac® anti-gonadotropin-releasing factor vaccine developed for pigs on the carcass quality and shelf life of meat from Serrana de Teruel bulls at two liveweights at the start of immunisation. The anti-gonadotropin-releasing factor vaccine stopped testosterone production regardless of the liveweight. The carcasses of immunised bulls were less heavy and had poorer conformation than those of entire bulls, although the dressing percentages were similar. Immunisation had no influence on the degree of carcass fatness or intramuscular fat content. Immunisation decreased metmyoglobin formation during storage, especially in light bulls. Immunisation reduces the total meat collage, improving tenderness and reducing the ageing time. Minimum toughness was reached 2 weeks earlier than in entire bulls. Quick tenderisation was achieved regardless of the liveweight at immunisation; therefore, the technique studied here could be effective for producing tender meat and avoiding long periods of maturation. In conclusion, immunisation at any of the initial liveweights trialed may be detrimental to animal performance. However, it was effective in delaying metmyoglobin formation and produced more tender meat than that of entire bulls from the first day, thus reducing the ageing time.

scholarly journals Review on the consequences of using Improvac TM in modern pig production

2013 ◽  
Vol 3 (1) ◽  
pp. 1 ◽  
Author(s):  
Anna Katharina Albrecht
Keyword(s):  
Boar Taint ◽  
Alternative Methods ◽  
Daily Weight Gain ◽  
Feed Conversion ◽  
Pig Production ◽  
Additional Costs ◽  
Economic Analyses ◽  
Gonadotropin Releasing Factor ◽  
Better Than

In Europe growing concerns regarding animal welfare issues in pig production have forced the pig industry to introduce alternative methods to conventional castration procedures. Besides the raising of entire males and castration in combination with analgesia and anaesthesia the vaccination against GnRF (Gonadotropin-releasing factor) seems to be the most promising long-term solution. Immunised male pigs (IM) show higher average daily weight gain than surgically castrated males (CM). Additionally the feed intake in IM is lower than in CM and feed conversion ratio is consequently better. Carcass weight, back fat depth and dressing percentage of IM pigs are intermediate between CM and entire males while meat quality seems not to be influenced by castration technique since CM and IM show comparable results. Steroid hormone concentrations in IM decline to very low levels (below detection line) after the second administration of the anti-GnRF vaccine and boar taint compounds are reliably metabolized. Pigs which received two injections of the anti-GnRF vaccine reduce their sexual and aggressive behaviour to levels of CM pigs which results in low incidents of injury and carcass damages. Surveys analyzing the consumers’ attitude to vaccination against boar taint reveal that if profound information on the technique is provided, the acceptance of meat from vaccinated animals is even better than the acceptance of meat from pigs castrated under current farm conditions. Furthermore economic analyses reveal that immunisation against GnRF provides a potential for a return on investment since better feed efficiency compensates for the additional costs of drug and labour time.

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