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Immunocontraception As a Tool for Controlling Reproduction in Coyotes

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Immunocontraception As a Tool for Controlling Reproduction in Coyotes University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Symposium Proceedings—Coyotes in the Southwest: A Compendium of Our Knowledge Wildlife Damage Management, Internet Center (1995) for March 1995 IMMUNOCONTRACEPTION AS A TOOL FOR CONTROLLING REPRODUCTION IN COYOTES Lowell A. Miller U. S. Department of Agriculture, National Wildlife Research Center Follow this and additional works at: https://digitalcommons.unl.edu/coyotesw Part of the Environmental Health and Protection Commons Miller, Lowell A., "IMMUNOCONTRACEPTION AS A TOOL FOR CONTROLLING REPRODUCTION IN COYOTES" (1995). Symposium Proceedings—Coyotes in the Southwest: A Compendium of Our Knowledge (1995). 20. https://digitalcommons.unl.edu/coyotesw/20 This Article is brought to you for free and open access by the Wildlife Damage Management, Internet Center for at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Symposium Proceedings—Coyotes in the Southwest: A Compendium of Our Knowledge (1995) by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. IMMUNOCONTRACEPTION AS A TOOL FOR CONTROLLING REPRODUCTION IN COYOTES LOWELL A MILLER, U. S. Dcpatment of Agriculture, National Wildlife Research Center, 17 16 Heath Parkway, Fott Collins. CO 80524 Abstract: The development of imrnunocontraception as a tool for population management of coyotes (Canis la~.ans)and reduction of coyote predation may provide an environmentally safer alternative to pesticides. Because they are proteins, ~mmunocontraceptivevaccines do not persist in the environment or bioaccumulate in the food chain. The National Wildlife Research Center (NWRC) will examine the effects (immunological, holmonal and behavioral) of treating penned coyotes with 2 imrnunocontraceptive vaccines: porcine zona pellucida (PZP) and gonadotropin releas~nghoimone (GnRH). Initial studies will be conducted using traditional subcutaneous injections; howeva-, the goal IS to develop an orally-deliverable immunocontraceptive vaccine as an alternative tool for coyote populat~onmanagement Livestock predation by coyotes is a chronic predation problems conern of many sheep and goat ranchers. A 1990 survey estimated that, of the nearly 6 million lambs Immunocontraception has been suggested as 1 born in the 16 westeln states, 549,000 lambs died nonlethal technique with application for reducing from all causes (Connolly 1992). Nearly 60% of coyote numbers In areas where they are causing the losses were a I-esultof predators. Coyotes were depredat~onlosses, or for managing the predatory the main culprit, accounting for 70% of the behavior of tell-~tol-ialpairs (Knowlton 1989). predator-caused mot-talltles The econonlic impact However, private industry has had little economic on producers and consumers 11.1 1990 was approxi- incentive to develop new materials for this use mately $1 1 4 million Desp~teintensive historical because of the small quant~t~esof materials that control effol-1s in livestock production areas, and would be used in predation control This situation despite spoil hunting and trapping for fur, coyotes with mlmunoconkaception vaccines parallels that for cont~nueto thrivc and expand their range, occu11-ing toxicants and other coyote predation control prod- w~delyacross North and Central America ucts (Linhai-t et al 1992). Scientists at the Nat~onal Wildlife Research Center and its prcdeccssor laboratories have con- Basics of immunocontraception ducted research for over 50 years on the problem of livestock pl-edation by coyotes, and on developing The neonatal veltebl-ate immune system devel- methods to min~mizepredation losses Available ops a recogn~tionof "self' proteins, carbohydrates, techniques include husband~ypractices, shooting, and holmones. This self recognition is essential, trapping, frightening devices, livestock guarding since the production of antibodies against pathogenic dogs and tos~cants(Fall 1990). None of these bacteria and viluses is necessary for survival. control methods is completely practical or effective However, the foimation of antibodies against "self' in all of the diverse situat~onsin which coyote can be an abnolmal destructive process, e.g., dis- predation on l~vestockoccurs. Also, as the costs of eases like multiple sclerosis and arthritis. labor-intens~veskills and appl-oaches continue to increase, new techn~quesare needed. Further, The entire immune system is in constant surveil- coyotes are viewed increasingly by the public as a lance to detelmine "self' vs "foreign" proteins. For desirable w~ldl~fespeclcs Accordingly, efl'ective example, in the digestive ti-act, particles and organ- nonlethal methods are being sought for resolution of isms are examined and either tolerated or attacked by antibodies The respiratory and intestinal muco- sal surfaces contain various white blood cells (lym- protein surrounding the egg or oocyte. It is located phocytes and macrophages) that are responsible for on the outer surface of the egg between the oocyte generating specific immune responses. In the small and the granulosa cells. Antibodies to this glyco- intestine, groups of lymphoid cells known as Peyer's protein layer result in infertility by 1 or both of these patches (PP) sample bits of food proteins and micro- actions: (a) blocking sperm from binding to the ZP organisms as they pass through to determine if an layer, and (b) interfering with oocyte maturat~on. immune response will be directed against the incom- For a sperm to fertilize the egg, it must first bind to ing organism or food particle. a receptor on the ZP. An enzyme in the sperm breaks down the ZP and allows the sperm passage Anti-fertility vaccines are directed against "self' Into the ovum. Ant~bodiesto the ZP also prevent reproductive antigens (holmones or proteins) to fertilization by interfering with oocyte-granulosa cell which the recipient normally is immunologically communication, resulting in the death of the devel- tolerant. These antigens are made "non-self' or oping oocyte (Dunbar and Schwoebel 1988). "foreign" by coupling them to a protein that is recognized as fore~gnto the animal. As the animal' Smce protein in the sperms' head normally bind immune system exanlines the conjugated self-fore~gn to the ZP receptor on the oocyte, antibodies to these protein, antibodies are produced to its own repro- sperm prote~nscan be produced, by vaccination in ductive proterns and holmones This Induced the female that are available to bind to sperm In the immune response agalnst "self' is the key to oviduct. This prevents sperm fiom binding to the ZP immunocontracept~on The mfer-tility lasts as long as receptor Sperm protein immunocontraception IS there are suflic~entantrbod~es to intelfere wrth the belng investrgated for contraception of the red fox biological activ~tyof the targeted hormone or repro- and the rabbit In Australia (Morel1 1993, Tyndale- ductive protein, usually 1-2 years. B~scoe199 1) A ZP protein has not been identified in avian species, nor has the cross-reactivity of PZP been tested in avian species. Reproductive hormones and proteins involved in immunocontraception Chorionic gonadotropin (CG) holmone, which is produced by the Implanting embryo in some Immunocontraceptive vaccines can control species, induces the corpus luteum to continue reproduction at various stages They can interrupt production of progesterone which is required for the the reproductrve activrty of both sexes by (a) inter- maintenance of pregnancy. Ant~bodiesto CG reduce ferrng with the biological act~vrtyof hornlones, (b) blood levels of this holmone and thereby prevent block~ngspelni penetration of an ovulated egg, or ~mplantationof the fertilized egg. (c) preventing implantat~onand development of a fertilized egg The riboflav~nrequirement of the developing emblyo is sat~sfiedby active transport of this water- Gonadotropin releasing holmone (GnRH) 1s soluble v~taminacross the placenta. This transport produced in the bra~nby the hypothalamus and is provided by a gestatronal-specific carrier protern controls release of the pituitaly reproductive hor- called riboflavin carrier protein (RCP). RCP plays mones follrcle stimulating holmone (FSH) and a pivotal role in emb~yodevelopment in avian and luteinizing hormone (LH). These ho~monesin turn mammalian specles. Antibodies formed agalnst control the hormonal hncrions of the gonads (ova- RCP interfere w~thplacental transfer of riboflavin, ries and testes) Antibodies to the hypothalamic thereby preventing development of the early embryo. hormone will reduce the crrculating level of This technology probably would result in the least biologically-active GnIUI, thereby reducing the change in social behav~orof the target species of any release of subsequent reproductive hormones. The of the proposed vaccines (Natraj et al. 1987, 1988). reduction or absence of these hormones leads to atrophy of the gonads, resulting in infertil~tyin both Reproduction can be blocked at many sites in sexes. Both avran and mammalian fo~msof GnRH the reproductive process; the above examples are the have been Identified. sites where most investigative work has been done. Behavioral and social changes in target animals The zona pellucida (ZP) is an acellular glyco- result~ngfrom specific vaccines may dictate the vaccine of choice in each s~tuation(Jones 1982, surviving intact through the stomach, it must have Griffin 1992). adhesive properties which allow it to adhere to and colonize the intestinal wall, resulting in an infection. Bacteria
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