The robustness of faecal steroid determination for pregnancy testing Kaimanawa feral mares under field conditions

References

• Cameron , EZ . 1998 . “ Maternal investment in Kaimanawa horses ” . In Ph.D. Thesis. Massey University , New Zealand : Palmerston North .
   Google Scholar
• Cameron , EZ , Linklater , WL , Stafford , KJ and Veltman , CJ . 1999 . Birth sex ratios relate to mare condition at conception in Kaimanawa horses . Behavioral Ecology , 10 : 273 – 275 .
   Google Scholar
• Choi , HS , Mostl , E and Bamberg , E . 1985 . Confirmation of pregnancy in mares by enzyme immunoassay of oestrogens in faeces . Zentralblatt für Veterinärmedizin A , 32 : 760 – 763 .
   Google Scholar
• Dasaulniers , DM , Goff , AK , Betteridge , KJ , Rowell , JE and Flood , PF . 1989 . Reproductive hormone concentrations in faeces during the oestrous cycle and pregnancy in cattle (Bos taurus) and muskoxen (Ovibos moschatus) . Canadian Journal of Zoology , 67 : 1148 – 1154 .
   Google Scholar
• Henderson , KM , Hardie , AHM and Camberis , M . 1994 . Measurement of steroids by enzymeimmunoassay: an environmentally friendly alternative to radioimmunoassay . Proceedings of the New Zealand Society of Animal Production , 54 : 55 – 58 .
   Google Scholar
• Henderson , KM , Perkins , NR , Wards , RL and Stewart , JI . 1997 . Non-invasive pregnancy determination in mares by enzymeimmunoassay of oestrone sulphate concentrations in faeces . Proceedings of the New Zealand Society for Animal Production , 57 : 234 – 236 .
   Google Scholar
• Henderson , KM , Perkins , NR , Wards , RL and Stewart , JI . 1999 . Enzymeimmunoassay of oestrone sulphate concentration in faeces for non-invasive pregnancy determination in mares . New Zealand Veterinary Journal , 47 : 61 – 66 .
   PubMed Web of Science ®Google Scholar
• Henderson , K , Stevens , S , Bailey , C , Hall , G , Stewart , J and Wards , R . 1998 . Comparison of the merits of measuring equine chorionic gonadotrophin (eCG) and blood and faecal concentrations of oestrone sulphate for determining the pregnancy status of miniature horses . Reproduction, Fertility and Development , 10 : 441 – 444 .
   PubMed Web of Science ®Google Scholar
• Kiltie , RA . 1982 . Intra-specific variation in the mammalian gestation period . Journal of Mammalogy , 63 : 646 – 652 .
   Web of Science ®Google Scholar
• Kirkpatrick , JF , Gudermuth , DF , Flagan , RL , McCarthy , JC and Lasley , BL . 1993a . Remote monitoring of ovulation and pregnancy ofYellowstone bison . Journal of Wildlife Management , 57 : 407 – 412 .
   Google Scholar
• Kirkpatrick , JF , Lasley , BL , Shideler , SE , Roser , JF and Turner , JW Jr . 1993b . Non-instrumented immunoassay field tests for pregnancy detection in free-roaming feral horses . Journal of Wildlife Management , 57 : 168 – 173 .
   Google Scholar
• Linklater , WL , Cameron , EZ , Minot , EO and Stafford , KJ . 1999 . Stallion harassment and the mating system of horses . Animal Behaviour , 58 : 295 – 306 .
   PubMedGoogle Scholar
• Linklater , WL , Cameron , EZ , Stafford , KJ and Veltman , CJ . 2000 . Social and spatial structure and range use by Kaimanawa wild horses (Equus caballus: Equidae) . New Zealand Journal of Ecology , 24 : 139 – 152 .
   Web of Science ®Google Scholar
• Lucus , Z , Raeside , JI and Betteridge , KJ . 1991 . Non-invasive assessment of the incidences of pregnancy and pregnancy loss in the feral horses of Sable Island . Journal of Reproduction and Fertility, Supplement , 44 : 479 – 488 .
   Google Scholar
• Messier , F , Desaulniers , DM , Goff , AK , Nault , R , Patenaude , R and Crete , M . 1990 . Pregnancy diagnosis in caribou using progesterone and estrogen concentrations in faeces . Canadian Journal of Zoology , 54 : 279 – 283 .
   Google Scholar
• Monfort , SL , Arthur , NP and Wildt , DE . 1991 . Monitoring ovarian function and pregnancy by evaluating excretion of urinary oestrogen conjugates in semi-free-ranging Przewalski's horses (Equus przelwalskii) . Journal of Reproduction and Fertility , 91 : 155 – 164 .
   Google Scholar
• Safar-Herman , N , Ismail , MN , Chol , HS , Mostl , E and Bamberg , E . 1987 . Pregnancy diagnosis in zoo animals by estrogen determination in feces . Zoo Biology , 6 : 189 – 193 .
   Google Scholar
• Schwartz , CC , Monfort , SL , Dennis , PH and Hundertmark , KJ . 1995 . Fecal progestagen concentration as an indicator of the estrous cycle and pregnancy in moose . Journal of Wild life Management , 59 : 580 – 583 .
   Google Scholar
• Schwarzenberger , F , Mostl , E , Palme , R and Bamberg , E . 1993 . Fecal steroid analysis for non-invasive monitoring of reproductive status in farm, wild and zoo animals . Animal Reproduction Science , 42 : 515 – 526 .
   Google Scholar
• Sist , MD , Youngblood , MA and Williams , JF . 1987 . Using faecal estrone sulfate concentrations to detect pregnancies . Veterinary Medicine , 82 : 1036 – 1043 .
   Google Scholar
• Wasser , SK , Monfort , SL and Wildt , DE . 1991 . Rapid extraction of faecal steroids for measurement of reproductive cyclicity and early pregnancy in free-ranging yellow baboons (Papio cynocephalus cynocephalus) . Journal of Reproduction and Fertility , 92 : 415 – 423 .
   Google Scholar
• Wasser , SK , De Lemos Velloso , A and Rodden , MD . 1995 . Using fecal steroids to evaluate reproductive function in female maned wolves . Journal of Wildlife Management , 59 : 889 – 894 .
   Google Scholar
• Wasser , SK , Papageorge , S , Foley , C and Brown , JL . 1996 . Excretory fate of estradiol and progesterone in the African elephant (Loxodonta africana) and patterns of fecal steroid concentrations throughout the oestrous cycle . General and Comparative Endocrinology , 102 : 255 – 262 .
   Google Scholar