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GONAbreed

This page contains information on GONAbreed for veterinary use.
The information provided typically includes the following:
  • GONAbreed Indications
  • Warnings and cautions for GONAbreed
  • Direction and dosage information for GONAbreed

GONAbreed

This treatment applies to the following species:
Manufacturer: Parnell

(gonadorelin acetate)

Equivalent to 100 mcg gonadorelin/mL

Sterile solution

For the treatment of cystic ovaries in dairy cattle.

For use with cloprostenol sodium to synchronize estrous cycles to allow for fixed time artificial insemination (FTAI) in lactating dairy cows and beef cows.

GONAbreed Caution

Federal (U.S.A.) law restricts this drug to use by or on the order of a licensed veterinarian.

Description

GONAbreed is a sterile solution containing 100 micrograms of gonadorelin (GnRH) as gonadorelin acetate per milliliter suitable for intramuscular or intravenous administration according to the indication. Gonadorelin is a decapeptide composed of the sequence of amino acids -

5-oxoPro-His-Trp-Ser-Tyr-Gly-Leu-Arg-Pro-Gly-NH2 -

a molecular weight of 1182.32 and empirical formula C55H75N17O13. The acetate salt has a molecular weight of 60.05 and an empirical formula C55H75N17O13. C2H4O2.

Gonadorelin is the hypothalamic releasing factor responsible for the release of gonadotropins (e.g., LH, FSH) from the anterior pituitary. Synthetic gonadorelin is physiologically and chemically identical to the endogenous bovine hypothalamic releasing factor.

PHARMACOLOGY AND TOXICOLOGY:

Endogenous gonadorelin is synthesized and/or released from the hypothalamus during various stages of the bovine estrous cycle following appropriate neurogenic stimuli. It passes via the hypophyseal portal vessels, to the anterior pituitary to effect the release of gonadotrophins (e.g. LH, FSH). Synthetic gonadorelin administered intravenously or intramuscularly also causes the release of endogenous LH or FSH from the anterior pituitary.

Gonadorelin acetate has been shown to be safe. The LD50 for mice and rats is greater than 60 mg/kg, and for dogs, greater than 600 mcg/kg, respectively. No untoward effects were noted among rats or dogs administered 120 mcg/kg/day or 72 mcg/kg/day intravenously for 15 days.

It has no adverse effects on heart rate, blood pressure, or EKG to unanesthetized dogs at 60 mcg/kg. In anesthetized dogs it did not produce depression of myocardial or system hemodynamics or adversely affect coronary oxygen supply or myocardial oxygen requirements.

The intravenous administration of 60 mcg/kg/day of gonadorelin acetate to pregnant rats and rabbits during organogenesis did not cause embryotoxic or teratogenic effects.

The intramuscular administration of 1,000 mcg to normally cycling dairy cattle had no effect on hematology or blood chemistry.

Further, gonadorelin acetate does not cause irritation at the site of intramuscular administration in dogs. The dosage administered was 72 mcg/kg/day for seven (7) days.

INDICATIONS AND DOSAGE:

Cystic Ovaries

GONAbreed is indicated for the treatment of ovarian follicular cysts in dairy cattle. Ovarian cysts are non-ovulated follicles with incomplete luteinization which result in nymphomania or irregular estrus.

Historically, cystic ovaries have responded to an exogenous source of luteinizing hormone (LH) such as human chorionic gonadotrophin. GONAbreed initiates release of endogenous LH to cause ovulation and luteinization.

The recommended intravenous or intramuscular dosage of GONAbreed is 100 mcg (1 mL) per cow.

Reproductive Synchrony

GONAbreed is indicated for use with cloprostenol sodium to synchronize estrous cycles to allow for fixed time artificial insemination (FTAI) in lactating dairy cows and beef cows.

The recommended intramuscular dosage of GONAbreed is 100 mcg (1 mL) per cow, used in reproductive synchrony programs similar to the following:

Administer the first GONAbreed injection (1 mL) at Time 0.

Administer 500 mcg cloprostenol (as cloprostenol sodium) by intramuscular injection 6 to 8 days after the first GONAbreed injection.

Administer the second GONAbreed injection (1 mL) 30 to 72 hours after the cloprostenol sodium injection.

Perform FTAI 0 to 24 hours after the second GONAbreed injection, or inseminate cows on detected estrus using standard herd practices.

TARGET ANIMAL SAFETY:

In addition to the target animal safety information presented in the section addressing pharmacology and toxicology, target animal safety of, and injection site reactions to, GONAbreed when used with cloprostenol sodium were evaluated during the conduct of the effectiveness field studies. The incidence of health abnormalities was not significantly greater in cows administered GONAbreed than cows administered a placebo injection.

Effectiveness

The effectiveness of GONAbreed (gonadorelin acetate) for use with cloprostenol sodium to synchronize estrous cycles to allow for FTAI in lactating dairy cows was demonstrated in a field study at 10 different locations in the U.S. Four of the locations represented conditions that would typically cause heat stress in lactating cows. A total of 1607 healthy, non-pregnant, primiparous or multiparous lactating dairy cows within 40-150 days postpartum were enrolled in the study. A total of 805 cows were administered GONAbreed (1 mL; 100 mcg gonadorelin as the acetate salt) and 802 cows were administered an equivalent volume of water for injection as an intramuscular injection twice in the following regimen:

Day 0: 1 mL GONAbreed or sterile water for injection

Day 7: 500 mcg cloprostenol (as cloprostenol sodium)

Day 9: 1 mL GONAbreed or sterile water for injection

Fixed time AI was performed on Day 10, approximately 11 - 31 hours after the Day 9 injection. Cows were evaluated for pregnancy on Day 45 ± 5 days by trans-rectal ultrasound or rectal palpation. Pregnancy rate to FTAI was significantly higher (P < 0.0001) in cows treated with GONAbreed (33.4%) than the pregnancy rate to FTAI in cows treated with water (13.6%). The environmental condition (heat stress or not heat stress) did not affect the conclusion of effectiveness.

The effectiveness of GONAbreed (gonadorelin acetate) for use with cloprostenol sodium to synchronize estrous cycles to allow for FTAI in beef cows was demonstrated in a field study at 10 different locations in the U.S. A total of 706 healthy, non-pregnant, primiparous or multiparous beef cows within 40-150 days postpartum were enrolled in the study. A total of 364 cows were administered GONAbreed (1 mL; 100 mcg gonadorelin as the acetate salt) and 342 cows were administered an equivalent volume of water for injection as an intramuscular injection twice in the following regimen:

Day 0: 1 mL GONAbreed or sterile water for injection

Day 7: 500 mcg cloprostenol (as cloprostenol sodium)

Day 9: 1 mL GONAbreed or sterile water for injection

Fixed time AI was performed immediately after the Day 9 injection. Cows were evaluated for pregnancy on Day 55 ± 5 days by trans-rectal ultrasound. Pregnancy rate to FTAI was significantly higher (P = 0.0006) in cows treated with GONAbreed (21.7%) than the pregnancy rate to FTAI in cows treated with water (7.4%).

Each mL of GONAbreed contains:

Gonadorelin (as gonadorelin acetate) 100 mcg

Benzyl alcohol 10 mg

Sodium chloride 7.47 mg

Sodium phosphate monobasic 8.3 mg

Sodium phosphate dibasic 4.8 mg

Water for injection, USP, q.s.

pH adjusted with hydrochloric acid or sodium hydroxide.

Precautions

Not for use in humans.

Keep this and all drugs out of reach of children.

The Material Safety Data Sheet (MSDS) contains more detailed occupational safety information. To obtain an MSDS or for technical assistance, contact Parnell at 1-800-88-PARNELL (1-800-887-2763). To report suspected adverse drug experiences, contact Parnell at 1-800-88-PARNELL (1-800-887-2763). For additional information about adverse drug experience reporting for animal drugs, contact FDA at 1-888-FDA-VETS, or http://www.fda.gov/AnimalVeterinary.

Discard remaining product 180 days after first use. Once broached, product may be stored at temperatures up to 25°C (77°F).

KEEP UNOPENED VIALS REFRIGERATED: 2° - 8°C (36° - 46°F).

How Supplied

GONAbreed is available in a concentration of 100 mcg gonadorelin/mL as gonadorelin acetate.

GONAbreed is supplied in multidose vials containing 20 mL and 100 mL of sterile solution.

Manufactured by: PARNELL TECHNOLOGIES PTY. LTD., 4/476 Gardeners Road, Alexandria NSW 2015 Australia

Owner of the trademark GONAbreed

Distributed by: PARNELL U.S. 1, Inc, 7015 College Boulevard, Level 6, Overland Park, KS 66211

ANADA 200-541. Approved by FDA

20 mL: 50297b-05-November 14

100 mL: 50303b-03-November 14

NAC No.: 1665001.2

PARNELL U.S. 1, INC.
7015 COLLEGE BLVD., LEVEL 6, OVERLAND PARK, KS, 66211
Telephone:   913-274-2100
Toll-Free:   1-800-88PARNELL (1-800-887-2763)
Fax:   913-274-2101
Website:   www.parnell.com
    www.mysynch.com
Email:   KansasCity@parnell.com
Every effort has been made to ensure the accuracy of the GONAbreed information published above. However, it remains the responsibility of the readers to familiarize themselves with the product information contained on the US product label or package insert.

Copyright © 2016 North American Compendiums. Updated: 2016-10-31

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