Summary
Cow-calf behavior was observed in American bison (Bison bison) to determine if mothers invested differentially in sons and daughters. Cows nursed sons significantly longer than they did daughters in their first three months of life. The increased nursing time for sons was not compensated for by increased grazing time by their mothers. Grazing and activity patterns did not differ significantly between sons and daughters. Cows that had sons bred later in the breeding season than nulliparous cows, barren cows, or cows with daughters. Nine yearling sons compared to only two yearling daughters continued to suckle from their mothers for up to 15 months of age. Cows that had sons the previous year were more apt to be barren in the current year than cows that had daughters in the previous year.
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References
Altmann J (1974) Observational study of behavior: sampling methods. Behaviour 49:227–267
Altmann J, Altmann SA, Hausfater G (1987) Determinants of reproductive success in savannah baboons. In: Clutton-Brock TH (ed) Reproductive success. University of Chicago Press, Chicago
Belovsky GE (1986) Optimal foraging and community structure: implications for a guild of generalist grassland herbivores. Oecologia 70:35–52
Berger J (1988) Female reproductive potential and its apparent evaluation in male mammals. J Mammal (in press)
Caley MJ, Nudds TD (1987) Sex-ratio adjustment in Odocoileus: Does local resource competition play a role? Am Nat 129:452–457
Clutton-Brock TH, Albon SD (1982) Parental investment in male and female offspring in mammals. In: King's College Sociobiology Group (eds) Current problems in sociobiology. Cambridge University Press, Cambridge, pp 223–247
Clutton-Brock TH, Guiness FE, Allbon SD (1983) The costs of reproduction to red deer hinds. J Anim Ecol 52:367–383
Clutton-Brock TH, Albon SD, Guiness FE (1984) Maternal dominance, breeding success, and birth sex ratios in red deer. Nature (London) 308:358–360
Clutton-Brock TH, Albon SD, Guiness FE (1986) Great expectations: dominance, breeding success and offspring sex ratios in red deer. Anim Behav 34:460–471
Fuller WA (1961) The ecology and management of the American bison. Terre Vie 108:286–304
Fuller WA (1966) The biology and management of the bison of Wood Buffalo National Park. Wildl Mgmt Bull Canadial Wildl Serv Ser 1, 16:1–52
Green WCH (1986) Age-related differences in nursing behavior among American bison cows (Bison bison). J. Mammal 67:739–741
Halloran AF (1961) American bison weights and measurements from the Wichita Mts. Refuge. Proc Oklahoma Acad Sci 41:212–218
Halloran AF (1968) Bison (Bovidae) productivity on the Wichita Mountains Wildlife Refuge, Oklahoma. Southwest Nat 13:23–36
Haugen AO (1974) Reproduction in the plains bison. Iowa State J Research 49:1–8
Lee PC, Moss CJ (1986) Early maternal investment in male and female African elephant calves. Behav Ecol Sociobiol 18:353–361
Lott DF (1974) Sexual and aggressive behavior of adult male American bison (Bison bison). In: Geist V, Walther F (eds) The behaviour of ungulates and its relation to management. International Union for Conservation of Nature and Natural Resources, Morges, Switzerland, pp 382–394
Lott DF (1979) Dominance relations and breeding rate in mature male American bison. Z Tierpsychol 49:418–432
Lott DF (1981) Sexual behavior and intersexual strategies in American bison. Z Tierpsychol 56:97–114
Lott DF, Galland JC (1987) Body mass as a factor influencing dominance status in American bison cows. J Mammal 68:683–685
Maher CR, Byers JA (1987) Age-related changes in reproductive effort of male bison. Behav Ecol Sociobiol 21:91–96
McGinley MA (1984) The adaptive value of male biased sex ratios among stressed animals. Am Nat 124:597–599
McHugh T (1958) Social behavior of the American buffalo (Bison bison bison). Zoologica (NY) 43:1–40
McHugh T (1972) The time of the buffalo. Knopf, New York, p 339
Meagher MM (1973) The bison of Yellowstone National Park. National Park Service Science Monograph Series 1
Reiter J, Stinson NL, LeBoeuf BJ (1978) Northern elephant seal development: the transition from weaning to nutritional independence. Behav Ecol Sociobiol 3:337–367
Rutberg AT (1983) Factors influencing dominance status in American bison cows. Z Tierpsychol 63:206–212
Rutberg AT (1984) Birth synchrony in American bison (Bison bison): response to predation or season? J Mammal 65:418–423
Rutberg AT (1986) Lactation and fetal sex ratios in American bison. Am Nat 127:89–94
Silk JB (1983) Local resource competition and facultative adjustment of sex ratios in relation to competitive abilities. Am Nat 121:56–66
Simpson MJA, Simpson AE (1982) Birth sex ratios and social rank in rhesus monkey mothers. Nature (London) 300:440–441
Trillmich F (1986) Maternal investment and sex-allocation in the Galapagoes fur seal, Arctocephalus galapagoensis. Behav Ecol Sociobiol 19:157–164
Trivers RL, Willard DE (1973) Natural selection of parental ability to vary the sex ratio of offspring. Science (Washington DC) 179:90–92
Verme LJ (1983) Sex ratio variation in Odocoileus: a critical review. J Wildl Manage 47:573–582
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Wolff, J.O. Maternal investment and sex ratio adjustment in American bison calves. Behav Ecol Sociobiol 23, 127–133 (1988). https://doi.org/10.1007/BF00299896
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DOI: https://doi.org/10.1007/BF00299896