FACTOID # 8: Bookworms: Vermont has the highest number of high school teachers per capita and third highest number of librarians per capita.
 
 Home   Encyclopedia   Statistics   States A-Z   Flags   Maps   FAQ   About 
 
WHAT'S NEW
RELATED ARTICLES
People who viewed "Neutering" also viewed:
 

SEARCH ALL

FACTS & STATISTICS    Advanced view

Search encyclopedia, statistics and forums:

 

 

(* = Graphable)

 

 


Encyclopedia > Neutering

Neutering, from the Latin neŭter (of neither type), is the removal of an animal's reproductive organ, either all of it or a considerably large part of it. It is the most drastic surgical procedure with sterilizing purposes. The process is also referred to as castration, or gelding in male horses; while the process in females is also called spaying. For other uses, see Latin (disambiguation). ... A sex organ, or primary sexual characteristic, narrowly defined, is any of those parts of the body (which are not always bodily organs according to the strict definition) which are involved in sexual reproduction and constitute the reproductive system in an complex organism; namely: Male: penis (notably the glans penis... Sterilization is a surgical technique leaving a male or female unable to procreate. ... Castration (also referred as: gelding, neutering, orchiectomy, orchidectomy, and oophorectomy) is any action, surgical, chemical, or otherwise, by which a male loses the functions of the testes or a female loses the functions of the ovaries. ... A gelding is a castrated animal—in English, a castrated male horse. ...


Unlike in humans, neutering is the most common sterilizing method in animals. While many agree on the advantages of neutering as a method of birth control, the necessity and humanity of this method (as opposed to alternative methods of birth control) and the political agendas within the debate are a subject of some controversy. In the USA, most humane societies, animal shelters, and rescue groups (not to mention numerous commercial entities) urge pet owners to have their pets "spayed or neutered" to prevent the births of unwanted litters, contributing to the overpopulation of animals. In Europe, the procedure is less commonly performed, especially in dogs. Sterilization is a surgical technique leaving a male or female unable to procreate. ... For other uses, see Birth control (disambiguation). ... A humane society is a group that aims to stop animal and human suffering due to cruelty or other reasons. ... Dog Pound redirects here. ... A rescue group or rescue organization takes unwanted or abused pets and attempts to find new, caring homes for them. ... Overpopulation is a scenario in which the population of a living species exceeds the carrying capacity of its ecological niche. ... For other uses, see Europe (disambiguation). ...

Contents

Health and behavioral effects

Advantages

In addition to being a birth control method, neutering has health benefits. Hormone-associated diseases such as benign prostatic hypertrophy are prevented. Female cats and dogs are seven times more likely to develop mammary tumors if they are not spayed before their first heat cycle. [1] A dangerous common uterine infection known as pyometra is also prevented. Uterine, ovarian, and testicular cancer are also prevented for obvious reasons, especially important because testicular tumors are the second most common tumor in intact male dogs. Benign prostatic hyperplasia (BPH) is the increase in size of the prostate in middle_aged and elderly men. ... A mammary tumor is a tumor originating in the mammary gland. ... The oestrus cycle (also Å“strus or estrous cycle) refers to the recurring physiologic changes that are induced by reproductive hormones in most mammalian placental females (humans and great apes are the only mammals who undergo a menstrual cycle instead). ... This article is about female reproductive anatomy. ... Pyometra is a disease of the uterus in bitches (female dogs). ... Endometrial cancer involves cancerous growth of the endometrium (lining of the uterus). ... Ovarian cancer is a malignant tumor (a kind of neoplasm) located on an ovary. ... Testicular cancer is cancer that develops in the testicles, a part of the male reproductive system. ...


The procedure may end or curb such behaviors as roaming in search of a mate, and sexual mounting.


Disadvantages

General

  • As with any surgical procedure, immediate complications of neutering include the usual anesthetic and surgical complications, such as bleeding and infection. These risks are relatively low in routine spaying and neutering; however, they may be increased for some animals due to other pre-existing health factors.
  • Neutered dogs and cats of both genders have an increased risk of obesity. Theories for this include reduced metabolism, reduced activity, and eating more due to altered feeding behavior.[2]
  • Neutered dogs of both genders are at a twofold excess risk to develop osteosarcoma as compared to intact dogs [3] [4] [5], as well as an increased risk of hemangiosarcoma[6][7], and an increased risk of adverse reactions to vaccinations[8].
  • Neutered dogs have also been known to develop hormone-responsive alopecia (hair loss).[9]

Anesthesia or anaesthesia (see spelling differences) has traditionally meant the condition of having the perception of pain and other sensations blocked. ... “Surgeon” redirects here. ... Structure of the coenzyme adenosine triphosphate, a central intermediate in energy metabolism. ... Osteosarcoma is the most common type of malignant bone cancer, accounting for 35% of primary bone malignancies. ... Alopecia is a set of disorders ranging from male and female pattern alopecia (alopecia androgenetica), to alopecia areata, which involves the loss of some of the hair from the head, alopecia totalis, which involves the loss of all head hair, to the most extreme form, alopecia universalis, which involves the...

Specific to Males

  • In addition, neutered male dogs are at higher risk than intact males of developing moderate to severe geriatric cognitive impairment (geriatric cognitive impairment includes disorientation in the house or outdoors, changes in social interactions with human family members, loss of house training, and changes in the sleep-wake cycle) .[12]

Prostate cancer is a disease in which cancer develops in the prostate, a gland in the male reproductive system. ... Feline lower urinary tract disease (FLUTD) is a term that is used to cover many problems of the feline urinary tract, including stones and cystitis. ... Bladder stones in animals are a common occurrence, especially in domestic animals such as dogs and cats. ... In anatomy, the urethra is a tube which connects the urinary bladder to the outside of the body. ...

Specific to Females

The tone or style of this article or section may not be appropriate for Wikipedia. ... Pyometra is a disease of the uterus in bitches (female dogs). ...

Ambiguous

Obviously, most animals lose their libido due to the hormonal changes involved with both genders, and females no longer experience heat cycles, which are sometimes considered a major nuisance factor, especially in female cats. Minor personality changes may occur in the animal. Neutering is often recommended in cases of undesirable behavior in dogs, although studies suggest that while roaming, urine marking, and mounting are reduced in neutered males, it has little effect on aggression and other important behavioral issues. [18] Intact male cats are more prone to urine spraying, while many common behavioral causes of urine marking remain in castrated cats. For other uses, see Libido (disambiguation). ... The estrous cycle (also oestrous cycle; originally derived from Latin oestrus) comprises the recurring physiologic changes that are induced by reproductive hormones in most mammalian placental females. ...


Methods

Females (spaying)

In female animals, spaying involves abdominal surgery to remove the ovaries and uterus (ovariohysterectomy). Alternatively, it is also possible to remove the ovaries and leave the uterus inside (oophorectomy), which is mainly done in cats and young bitches. It is commonly practiced on household pets such as cats and dogs as a method of birth control, but is rarely performed on livestock. // For ovary as part of plants see ovary (plants) An ovary is an egg-producing reproductive organ found in female organisms. ... This article is about female reproductive anatomy. ... Binomial name Felis catus Linnaeus, 1758 Synonyms Felis lybica invalid junior synonym The cat (or domestic cat, house cat) is a small carnivorous mammal. ... Trinomial name Canis lupus familiaris The dog (Canis lupus familiaris) is a domestic subspecies of the wolf, a mammal of the Canidae family of the order Carnivora. ... Sheep are commonly bred as livestock. ...


The surgery is usually performed through a ventral (belly) midline incision below the umbilicus (belly button). The incision size varies depending upon the surgeon and the size of the animal. The uterine horns are identified and the ovaries are found by following the horns to their ends. This article or section does not cite its references or sources. ...

Feline uterus
Feline uterus

There is a ligament that attaches the ovaries to the kidneys which may need to be broken so the ovaries can be identified. The ovarian arteries are then ligated twice (tied-off) with resorbable suture material and then the arteries transected (cut). The uterine body (which is very short in litter bearing species) and related arteries are also tied off just in front of the cervix (leaving the cervix as a natural barrier). The entire uterus and ovaries are then removed. The abdomen is checked for bleeding and then closed with a 3 layer closure. The linea alba (muscle layer) and then the subcutaneous layer (fat under skin) are closed with resorbable suture material. The skin is then stapled, sutured, or glued closed. Image File history File linksMetadata Size of this preview: 800 × 544 pixelsFull resolution (2050 × 1393 pixel, file size: 595 KB, MIME type: image/jpeg) File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Image File history File linksMetadata Size of this preview: 800 × 544 pixelsFull resolution (2050 × 1393 pixel, file size: 595 KB, MIME type: image/jpeg) File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... It has been suggested that this article or section be merged into suture. ... The cervix (from Latin neck) is the lower, narrow portion of the uterus where it joins with the top end of the vagina. ... The linea alba is a fibrous structure that runs down the midline of the abdomen in humans and other animals. ...


See also oophorectomy and hysterectomy. Oophorectomy is the surgical removal of the ovaries of a female animal. ... This article or section is in need of attention from an expert on the subject. ...


Males (castration)

In male animals, castration involves the removal of the testes, and is commonly practiced on both household pets (for birth control) and on livestock (for birth control, as well as to improve commercial value).


For more information, see castration and gelding (specific to horses). Castration (also referred as: gelding, neutering, orchiectomy, orchidectomy, and oophorectomy) is any action, surgical, chemical, or otherwise, by which a male loses the functions of the testes or a female loses the functions of the ovaries. ... A gelding is a castrated animal—in English, a castrated male horse. ...


Modern nonsurgical alternatives

Injectable

  • Male dogs - Neutersol (Zinc gluconate neutralized by arginine). Cytotoxic; produces infertility by chemical disruption of the testicle. It is no longer produced.
  • Male rats - Adjudin (analogue of indazole-carboxylic acid), induces reversible germ cell loss from the seminiferous epithelium by disrupting cell adhesion function between nurse cells and immature sperm cells, preventing maturation.
  • Female mammals - Vaccine of antigens (derived from purified Porcine zona pellucida) encapsulated in liposomes (cholesterol and lecithin) with an adjuvant, latest US patent RE37,224 (as of 2006-06-06), CA patent 2137263 (issued 1999-06-15). Product commercially known as SpayVac[19], a single injection causes a treated female mammal to produce antibodies that bind to ZP3 on the surface of her ovum, blocking sperms from fertilizing it for periods from 22 months up to 7 years (depending on the animal[20]).

Neutersol is a compound used to produce infertility in the male dog by chemical disruption of the testicle. ... Cytotoxicity is the quality of being poisonous to cells. ... Adjudin (AF-2364), also 1-(2,4-dichlorobenzyl)-1H-indazole-3-carbohydrazide, is an analogue of indazole-carboxylic acid that is of interest in the investigation for male contraception. ... An analog is in chemistry a chemical closely related to another usually sharing the same nucleus. ... Human male anatomy The testicles, known medically as testes (singular testis), are the male generative glands in animals. ... A Sertoli cell (a kind of sustentacular cell) is a nurse cell of the testes which is part of a seminiferous tubule. ... A Spermatogonium (plural: spermatogonia) is an intermediary male gametogonium (a kind of germ cell) in the production of spermatozoa. ... Cross section of the epithelium of a seminiferous tubule showing various stages of spermatocyte development Spermatogenesis is the process by which male spermatogonia develop into mature spermatozoa. ... Porcine zona pellucida is a form of zona pellucida extracted from the ovaries of pigs. ... The zona pellucida (or zona striata in older texts) is a glycoprotein membrane surrounding the plasma membrane of an oocyte. ...

Other

  • Noninvasive vasectomy using ultrasound.[21]

Surgical alternatives

Vasectomy: The snipping and tying of the vasa deferentia (plural of vas deferens). Failure rates are insignificantly small. Only a few veterinarians will perform the procedure. Vasectomy is a permanent birth control method for men in which the vasa deferentia are cut, thus sterilizing the patient. ...


Tubal Ligation: Snipping and tying of fallopian tubes as a sterilization measure can be performed on female cats and dogs. Risk of unwanted pregnancies is insignificantly small. Only a few veterinarians will perform the procedure.


Like other forms of neutering, vasectomy and tubal ligation eliminate the ability to produce offspring. They differ in that they leave the animal's levels and patterns of sex hormone unchanged. Females will still get in heat, want to mate, and the related issues will still be present. This method is favored by some of the people who want to infringe on the natural state of companion animals as little as necessary to achieve the reduction of unwanted births of cats and dogs. Sex hormones are hormones that affect the reproductive system. ...


Terminology for neutered animals

Male animals

Neutered males of given animal species sometimes have specific names:

Binomial name Felis catus Linnaeus, 1758 Synonyms Felis lybica invalid junior synonym The cat (or domestic cat, house cat) is a small carnivorous mammal. ... This article is about the mammal. ... The term gib may refer to: a castrated male cat or ferret an abbreviation for gibibyte (GiB) or gibibit (Gib) an abbreviation for Gibraltar an abbreviation for Gib Board, itself an abbreviation of Gibraltar Board, all Winston Wallboards[1] tradenames for drywall (plasterboard). ... For general information about the genus, including other species of cattle, see Bos. ... A Bullock is a castrated bull. ... Binomial name Bos taurus Linnaeus, 1758 Cattle are domesticated ungulates, a member of the subfamily Bovinae of the family Bovidae. ... Example EU engergy label According to an EU Directive most white goods and light bulb packaging must have an EU Energy Label clearly displayed when offered for sale or rent. ... For general information about the genus, including other species of cattle, see Bos. ... This article or section does not adequately cite its references or sources. ... A capon, soon to be roasted for a Christmas dinner. ... This article is about the ruminent animal. ... This article is about the domestic species. ... For other uses, see sheep (disambiguation). ... Binomial name Equus caballus Linnaeus, 1758 The horse (Equus caballus, sometimes seen as a subspecies of the Wild Horse, Equus ferus caballus) is a large odd-toed ungulate mammal, one of ten modern species of the genus Equus. ... A gelding is a castrated animal—in English, a castrated male horse. ... For other uses, see Pig (disambiguation). ... For other uses, see Pig (disambiguation). ... For other uses, see Rabbit (disambiguation). ... Lapin can mean: A castrated rabbit. ... Species See text. ... For other uses, see sheep (disambiguation). ...

Female animals

A specialized vocabulary in animal husbandry and fancy has arisen for spayed females of given animal species: Shepherd with his sheep in Făgăraş Mountains, Romania. ... Animal fancy is a hobby that includes pet and exotic pet ownership, showing and other competitions, breeding and judging. ...

This article or section does not adequately cite its references or sources. ... This article is about the mammal. ...

Miscellaneous

  • TV celebrity Bob Barker helped to popularize the spay-or-neuter drive by closing every episode of The Price Is Right with a request for people to help control the pet population by spaying or neutering their pets. In the movie Shrek 2, Donkey proposed that Puss in Boots be given the "Bob Barker Treatment", an indirect reference to neutering.
  • Orthodox Judaism forbids the castration of both humans and animals.[citation needed]

This article or section does not cite any references or sources. ... The Price Is Rights US 36th season logo. ... Shrek 2, which was released in the United States on May 19, 2004, is the 2004 sequel to the 2001 computer-animated DreamWorks Pictures film Shrek. ... Orthodox Judaism is the formulation of Judaism that adheres to a relatively strict interpretation and application of the laws and ethics first canonised in the Talmudic texts (Oral Torah) and as subsequently developed and applied by the later authorities known as the Gaonim, Rishonim, and Acharonim. ...

References

  1. ^ Morrison, Wallace B. (1998). Cancer in Dogs and Cats (1st ed.). Williams and Wilkins. ISBN 0-683-06105-4. 
  2. ^ German AJ (2006). "The growing problem of obesity in dogs and cats". J. Nutr. 136 (7 Suppl): 1940S–1946S. PMID 16772464. 
  3. ^ Priester, W. A. and McKay, F. W. (1980). "The occurrence of tumors in domestic animals". Natl Cancer Inst Monograph 54: 169. 
  4. ^ Ru, B., Terracini, G. et al. (1998). "Host related risk factors for canine osteosarcoma". Vet J 156(1):31-9. 
  5. ^ Cooley, D. M., Beranek, B. C. et al. (2002). "Endogenous gonadal hormone exposure and bone sarcoma risk". Cancer Epidemiol Biomarkers Prev 11(11): 1434-40. 
  6. ^ Prymak C, McKee LJ, Goldschmidt MH, Glickman LT. (1988). "Epidemiologic, clinical, pathologic, and prognostic characteristics of splenic hemangiosarcoma and splenic hematoma in dogs: 217 cases (1985).". J Am Vet Med Assoc. 193 (6): 706-712. 
  7. ^ Ware WA, Hopper DL (1999). "Cardiac Tumors in Dogs.". J Vet Intern Med. 13: 95-103. 
  8. ^ Moore GE, Guptill LF, Ward MP, Glickman NW, Faunt KF, Lewis HB, Glickman LT. (2005). "Adverse events diagnosed within three days of vaccine administration in dogs.". J Am Vet Med Assoc. 227 (7): 1102-1108. 
  9. ^ Ettinger, Stephen J.;Feldman, Edward C. (1995). Textbook of Veterinary Internal Medicine(4th ed.). W.B. Saunders Company. ISBN 0-7216-6795-3. 
  10. ^ Teske E, Nann EC, van Dijk EM, van Garderen E, Schalken JA (2002). "Canine prostate carcinoma: epidemiological evidence of an increased risk in castrated dogs.". Mol Cell Endocrinol. 197 (1-2): 251-255. 
  11. ^ Sorenmo KU, Goldschmidt M, Shofer F, Ferrocone J (2003). "Immunohistochemical characterization of canine prostatic carcinoma and correlation with castration status and castration time". Vet Comparative Oncology. 1 (1): 48-56. 
  12. ^ Hart BL. (2001). "Effect of gonadectomy on subsequent development of age-related cognitive impairment in dogs.". J Am Vet Med Assoc. 219 (1): 51-6. PMID 11439769. 
  13. ^ Lekcharoensuk C, Osborne CA, Lulich JP (2001). "Epidemiologic study of risk factors for lower urinary tract diseases in cats". J. Am. Vet. Med. Assoc. 218 (9): 1429-35. PMID 11345305. 
  14. ^ Thrusfield MV, Holt PE, Muirhead RH. (1998). "Acquired urinary incontinence in bitches: its incidence and relationship to neutering practices.". J Small Anim Pract. 39 (12): 559-566. 
  15. ^ Arnold S, Arnold P, Hubler M, Casal M, Rŭsch P (1989). "Urinary incontinence in spayed bitches: prevalence and breed disposition.". Europ J of Compan Anim Pract. 131 (5): 259-263. 
  16. ^ Thrusfield Mv (1985). "Association between urinary incontinence and spaying in bitches.". Vet Rec. 116: 695. 
  17. ^ Panciera DL (1994). "Hypothyroidism in dogs: 66 cases (1987-1992).". J Amer Vet Med Assoc 204 (5): 761-767. 
  18. ^ Neilson J., Eckstein R., Hart B (1997). "Effects on castration on problem behaviors in male dogs with reference to age and duration of behavior". JAVMA 211 (2): 180-182. 
  19. ^ SpayVac. Retrieved on early 2003.
  20. ^ * Horses - "In the fall of 2002 and the spring of 2003 we initiated a study to compare the long-term efficacy of a single-shot contraceptive vaccine directed at gonadotropin releasing hormone (GonaCon) with that of a single-shot vaccine directed at the zona pellucida (SpayVac) with the use of intrauterine contraceptive devices (IUD). Multiyear contraceptive efficacy was greatest for SpayVac, followed by GonaCon and the IUD. All mares in the SpayVac group were infertile ... during the first breeding season. In years two and three, 80% of the SpayVac-treated mares ... were infertile. It is noteworthy that the drop in contraception rate was greatest between years one and two with only minimal decrease from year two to year three. This suggests that considering the immunological response, there are two sub-populations of mares. One population responded with antibody titers adequate for contraception that were maintained over several years, versus the other population that lasted no more than one year. The average titer for SpayVac contracepted mares progressively declined during each year of study. However, the average titer in year 3 for contracepted SpayVac mares was still nearly 8-fold greater than the average “breakthrough” titer for all SpayVac-treated mares that became pregnant. There was a 37% decline in titer between year 1 and 2 and a 33% decline between years 2 and 3. If we assume an average annual rate of decline in titer of 35%, this suggests that on average, the majority of SpayVac-treated mares will remain contracepted for four additional years before the breakthrough titer is reached. This projection of a total of 7 years of contraception for SpayVac-treated mares is supported by the literature report of long-term efficacy of SpayVac use in Grey seals (Brown et al., 1997)." Gary Killian, Nancy K. Diehl, Lowell Miller, Jack Rhyan, David Thain (2007). "Long-term Efficacy of Three Contraceptive Approaches for Population Control of Wild Horses". Cattlemen's Update: 48-63. 
    • Deer - "We treated 20 does with SpayVac (zp-based vaccine) in March 2003, 33 does with GonaCon-KLH (GnRH-based vaccine) in February 2004, and 27 does with a modified SpayVac formulation in August 2004 in Princeton, NJ. We also administered GonaCon-KLH to 29 does in Madison, NJ (July 2005) and 15 does received GonaCon-Blue in Newark, DE (August 2005). After one year (2004), only one of 20 (5%) does gave birth after receiving SpayVac. None of the remaining 14 SpayVac-treated does gave birth the second year (2005), and 7 of the 13 (54%) remaining does gave birth the third year (2006). None (n = 16) of the does administered modified SpayVac reproduced in spring 2005. Three of 12 (25%) remaining does in this same treatment reproduced spring 2006." DeNicola, Anthony; Lowell A. Miller, James P. Gionfriddo, Kathleen A. Fagerstone (2007-3-16). Status of Present Day Infertility Technology. Northeast Association of Fish and Wildlife Agencies. Retrieved on 2007-3-16.
  21. ^ Fried NM, Sinelnikov YD, Pant BB, Roberts WW, Solomon SB (December 2001). "Noninvasive vasectomy using a focused ultrasound clip: thermal measurements and simulations". Biomedical Engineering, IEEE Transactions on 48 (12): 1453-9. PMID 11759926. 

External links


  Results from FactBites:
 
Neuter (545 words)
Neutering your pet will greatly reduce the risk of certain health problems as your dog or cat gets older.
Neutering is the best option for animals that have aggression in early stages of development, territory marking and many other undesirable behaviors.
Another equally important reason to have your pet neutered is to prevent unwanted litters of puppies and kittens.
Free spay and neuter, Free spay, Free neuter (1733 words)
Free spay and neuter, Free spay, Free neuter
A Free Spay and Neuter program is the only key solution to reduce the number of unwanted animals needlessly killed and born into a society that does not care.
Neutering lowers his urge to roam and to fight, and thus lowers chances of disease transmission and woundings.
  More results at FactBites »

 
 

COMMENTARY     


Share your thoughts, questions and commentary here
Your name
Your comments

Want to know more?
Search encyclopedia, statistics and forums:

 


Press Releases |  Feeds | Contact
The Wikipedia article included on this page is licensed under the GFDL.
Images may be subject to relevant owners' copyright.
All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
Usage implies agreement with terms, 1022, m