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Bouman Jg,. (1977). The future of Przewalski horses. Int Zoo Yearbook, 17, 62–68.
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Nitschelm D, H. V. D. C. (1977). The influence of chlormadinone acetate treatment on the concentration of some stereoids in the blood, on the ovarian activity, and on the sexual behaviour of the.. Tijdschr Diergeneesk, 102, 61–872.
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Green Nf, G. H. (1977). The wild horse population.... Proc National Wild Horse Forum, 1, 59–65.
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Keiper Rr,. (1977). Observations on the nocturnal behavior of feral ponies. Proc Pennsyl Acad Sci, 51, 57–58.
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Zeeb K,. (1977). Comparison du comportement des chevaux et des resultats du dressage au cirque. Ann Med Vet, 121, 37–38.
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Anderson, M. C., & Shettleworth, S. J. (1977). Behavioral adaptation to fixed-interval and fixed-time food delivery in golden hamsters. J Exp Anal Behav, 27(1), 33–49.
Abstract: Food-deprived golden hamsters in a large enclosure received food every 30 sec contingent on lever pressing, or free while their behavior was continuously recorded in terms of an exhaustive classification of motor patterns. As with other species in other situations, behavior became organized into two main classes. One (terminal behaviors) increased in probability throughout interfood intervals; the other (interim behaviors) peaked earlier in interfood intervals. Which class an activity belonged to was independent of whether food was contingent on lever pressing. When food was omitted on some of the intervals (thwarting), the terminal activities began sooner in the next interval, and different interim activities changed in different ways. The interim activities did not appear to be schedule-induced in the usual sense. Rather, the hamsters left the area of the feeder when food was not due and engaged in activities they would normally perform in the experimental environment.
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Ödberg Fo,. (1977). Studies on the formation of ungrazed eleminative areas in fields used by horses. Appl Anim Ethol, 3, 27–34.
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Olsen Fw, H. R. (1977). Food relations of wild free – roaming horses to livestock and big game, Red Desert, Wyoming. J Range Mgmt, 30, 17–20.
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Pacheco, M. A., & Herrera, E. A. (1977). Social Structure of Feral Horses in the Llanos of Venezuela. J Mammal, 78(1), 15–22.
Abstract: Feral horses (Equus caballus) in the Venezuelan savannas (Ilanos) formed bands of 3-35 individuals; mean group size varied between 15 and 21. Some bands had up to three adult males, and there was a positive correlation between the number of males and the number of females in bands. Adult males also were seen solitary or formed bachelor groups. One association of three females was observed for 3 months. We noted a correlation between number of females in bands and number of foals per female born during our study (January-July 1992). The advantages of being in larger groups were unclear, because natural predators were rare. Perhaps females in larger groups have more time available for foraging due to reduced individual vigilance or that larger groups live in better-quality home ranges.
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Rudy, J. W., Iwens, J., & Best, P. J. (1977). Pairing novel exteroceptive cues and illness reduces illness-induced taste aversions. J Exp Psychol Anim Behav Process, 3(1), 14–25.
Abstract: Four experiments are reported that lead to the conclusion that pairing novel exteroceptive stimulation (placement into a black compartment) with a poison (lithium chloride) attenuates the development of an aversion to a taste (saccharin) subsequently paired with the poison. Such an attenuation effect occurs whether the exteroceptive cues are present or absent when the taste-poison pairing is administered. Interpretation and implications of this finding are discussed.
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