Experimental elevation of wildlife testosterone using silastic tube implants

Antonio-cabrera, 2012, Effects of chronic estradiol or testosterone treatment upon sexual behavior in sexually sluggish male rats, Pharmacol. Biochem. Behav., 101, 336, 10.1016/j.pbb.2012.01.021 Bouissou, 1983, Androgens, aggressive behaviour and social relationships in higher mammals, Horm. Res. Paediatr., 18, 43, 10.1159/000179778 Busso, 2010, Testosterone manipulation postcastration does not alter cloacal gland growth differences in male quail selected for divergent plasma corticosterone stress response, Poult. Sci., 89, 2691, 10.3382/ps.2010-01052 Cheung, 1977, Effects of testosterone implants and hypothalamic lesions on luteinizing hormone regulation in the castrated male rat, Endocrinology, 100, 292, 10.1210/endo-100-2-292 Christensen, 1984, Passage of testosterone, testosterone propionate and testosterone enanthate from silastic implants and the retention of testosterone once it enters the blood of ewes, Anim. Reprod. Sci., 7, 531, 10.1016/0378-4320(84)90058-7 Christiansen, 2001, Hormones and sport: behavioural effects of androgen in men and women, J. Endocrynol., 170, 39, 10.1677/joe.0.1700039 Clarke, 2012, Sex differences in the metabolic effects of testosterone in sheep, Endocrinology, 153, 123, 10.1210/en.2011-1634 Clotfelter, 2004, Consequences of elevating plasma testosterone in females of a socially monogamous songbird: evidence of constraints on male evolution?, Horm. Behav., 46, 171, 10.1016/j.yhbeh.2004.03.003 Dziuk, 1966, Passage of steroids through silicone rubber, Endocrinology, 78, 208, 10.1210/endo-78-1-208 el Omari, 1989, Daily and seasonal variations in plasma LH and testosterone concentrations in the adult male hedgehog (Erinaceus europaeus), J. Reprod. Fertil., 86, 145, 10.1530/jrf.0.0860145 Ewing, 1973, Effect of testosterone polydimethyl-siloxane implants upon sperm production, libido and accessory sex organ function in rabbits, J. Reprod. Fertil., 35, 245, 10.1530/jrf.0.0350245 Girard-Buttoz, 2015, Androgen correlates of male reproductive effort in wild male long-tailed macaques (Macaca fascicularis): a multi-level test of the challenge hypothesis, Physiol. Behav., 141, 143, 10.1016/j.physbeh.2015.01.015 Godfrey, 1992, Effect of implanting bull calves with testosterone propionate, dihydrotestosterone propionate or oestradiol-17β prepubertally on the pituitary–testicular axis and on postpubertal social and sexual behaviour, J. Reprod. Fertil., 94, 57, 10.1530/jrf.0.0940057 Handelsman, 1990, Pharmacokinetics and pharmacodynamics of testosterone pellets in man, J. Clin. Endocrinol. Metab., 71, 216, 10.1210/jcem-71-1-216 Hunt, 1997, Testosterone implants increase song but not aggression in male Lapland longspurs, Anim. Behav., 54, 1177, 10.1006/anbe.1997.0558 Kellam, 2006, The role of testosterone in male downy woodpeckers in winter home range use, mate interactions and female foraging behaviour, Anim. Behav., 71, 695, 10.1016/j.anbehav.2005.07.012 Ketterson, 1992, Hormones and life histories: an integrative approach, Am. Nat., 140, S33, 10.1086/285396 Ketterson, 1991, Testosterone and avian life histories: the effect of experimentally elevated testosterone on corticosterone and body mass in dark-eyed juncos, Horm. Behav., 25, 489, 10.1016/0018-506X(91)90016-B Ketterson, 1992, Testosterone and avian life histories: effects of experimentally elevated testosterone on behavior and correlates of fitness in the dark-eyed junco (Junco hyemalis), Am. Nat., 140, 980, 10.1086/285451 Koren, 2009, Androgens and social status in female rock hyraxes, Anim. Behav., 77, 233, 10.1016/j.anbehav.2008.09.031 Koren, 2006, Elevated testosterone levels and social ranks in female rock hyrax, Horm. Behav., 49, 470, 10.1016/j.yhbeh.2005.10.004 Leary, 1991, Longitudinal assessment of changes in reproductive hormones during normal pregnancy, Clin. Chem., 37, 667, 10.1093/clinchem/37.5.667 Lee, 1990, Testosterone influences hibernation in golden-mantled ground squirrels, Am. J. Phys., 259, R760 Mazur A., 1998, Testosterone and dominance in men, Behav. Brain Sci., 21, 353, 10.1017/S0140525X98001228 Mehta, 2010, Neural mechanisms of the testosterone-aggression relation: the role of orbitofrontal cortex, J. Cogn. Neurosci., 22, 2357, 10.1162/jocn.2009.21389 Mendelssohn, 1965, Breeding the Syrian hyrax, Int. Zoo Yearbook, 5, 116, 10.1111/j.1748-1090.1965.tb01599.x Mills, 2009, Testosterone-mediated effects on fitness-related phenotypic traits and fitness, Am. Nat., 173, 475, 10.1086/597222 Mougeot, 2005, Testosterone and autumn territorial behavior in male red grouse Lagopus lagopus scoticus, Horm. Behav., 47, 576, 10.1016/j.yhbeh.2004.11.021 Nash, 1978, Steroid release from silastic capsules and rods, Contraception, 18, 367, 10.1016/0010-7824(78)90024-0 Neaves, 1973, Changes in testicular leydig cells and in plasma testosterone levels among seasonally breeding rock hyrax, Biol. Reprod., 8, 451, 10.1093/biolreprod/8.4.451 Ngun, 2011, The genetics of sex differences in brain and behavior, Front. Neuroendocrinol., 32, 227, 10.1016/j.yfrne.2010.10.001 Nolan, 1992, Testosterone and avian life histories: experimentally elevated testosterone delays postnuptial molt in male dark-eyed juncos, Condor, 94, 364, 10.2307/1369209 Ostatnikova, 2002, May testosterone levels and their fluctuations influence cognitive performance in humans, Scr. Med., 75, 245 Pollock, 2012, How do host sex and reproductive state affect host preference and feeding duration of ticks?, Parasitol. Res., 111, 897, 10.1007/s00436-012-2916-8 Raynaud, 2012, Experimental increase of testosterone levels in free-ranging juvenile male African striped mice (Rhabdomys pumilio) induces physiological, morphological, and behavioral changes, Gen. Comp. Endocrinol., 178, 108, 10.1016/j.ygcen.2012.04.028 Resko, 1966, Diurnal testosterone levels in peripheral plasma of human male subjects, J. Clin. Endocrinol. Metab., 26, 573, 10.1210/jcem-26-5-573 Robaire, 1979, Interactions of testosterone and estradiol-17β on the reproductive tract of the male rat, Biol. Reprod., 21, 455, 10.1095/biolreprod21.2.455 Rudd, 1996, Testosterone control of male-type sexual behavior in the tammar wallaby (Macropus eugenii), Horm. Behav., 30, 446, 10.1006/hbeh.1996.0049 Sahores, 2013, Novel, low cost, highly effective, handmade steroid pellets for experimental studies, PLoS One, 8, 10.1371/journal.pone.0064049 Slob, 1981, Effects of gonadectomy and exogenous gonadal steroids on sex differences in open field behaviour of adult rats, Behav. Brain Res., 2, 347, 10.1016/0166-4328(81)90017-6 Springer, 1997, Endemic African mammals shake the phylogenetic tree, Nature, 388, 61, 10.1038/40386 Starostová, 2013, Neither male gonadal androgens nor female reproductive costs drive development of sexual size dimorphism in lizards, J. Exp. Biol., 216, 1872, 10.1242/jeb.079442 Staub, 1997, The role of androgens in female vertebrates, Gen. Comp. Endocrinol., 108, 1, 10.1006/gcen.1997.6962 Taylor, 1969, Temperature regulation in the hyrax, Comp. Biochem. Physiol., 31, 903, 10.1016/0010-406X(69)91799-X Townsend, 1991, The lack of influence of exogenous testosterone on male parental behavior in a neotropical frog (Eleutherodactylus): a field experiment, Horm. Behav., 25, 313, 10.1016/0018-506X(91)90004-2 Vera, 2013, Seasonal variations in plasma cortisol, testosterone, progesterone and leukocyte profiles in a wild population of tuco-tucos, J. Zool., 289, 111, 10.1111/j.1469-7998.2012.00967.x Wingfield, 1990, The “challenge hypothesis”: theoretical implications for patterns of testosterone secretion, mating systems, and breeding strategies, Am. Nat., 136, 829, 10.1086/285134 Zucker, 1982, Circannual body weight rhythms of ground squirrels: role of gonadal hormones, Am. J. Phys., 243, R546 Zysling D.A., 2006, Behavioral and physiological responses to experimentally elevated testosterone in female dark-eyed juncos (Junco hyemalis carolinensis), Horm. Behav., 50, 200, 10.1016/j.yhbeh.2006.03.004