|
|
Mori, U. (1979). Ecological and sociological studies of gelada baboons. Inter-unit relationships. Contrib Primatol, 16, 83–92.
|
|
|
|
Mori, U. (1979). Ecological and sociological studies of gelada baboons. Unit formation and the emergence of a new leader. Contrib Primatol, 16, 155–181.
|
|
|
|
Graham, M., & Letz, R. (1979). Within-species variation in the development of ultrasonic signaling of preweanling rats. Dev Psychobiol, 12(2), 129–136.
Abstract: The development of litter and individual differences in the rate of ultrasonic signaling of neonatal rats was studied. Systematic variations among litters and individuals emerged, without differential treatment. These differences were not correlated with variations in general development as indexed by body weight. Two experiments using a cross-fostering design showed that litter differences developed independently of variations in postnatal environment. These results indicate that the variations among litters in ultrasound rate have a prenatal, possibly genetic, etiology and may represent reliable indicants of response to environmental stress.
|
|
|
|
[No authors listed]. (1979). International Conference on Environmental Cadmium: an overview. In Environmental Health Perspectives (Vol. 28, pp. 297–30).
|
|
|
|
Houpt, K. A. (1979). Intelligence of the horse. Equine Pract., 1, 20–26.
|
|
|
|
Bouman Jg,. (1979). Breeding Przewalski horse in captivity. In L. E. M. de Boer, J. Bouman, & I. Bouman (Eds.), Genetics and Herdeditary Diseases of the Przewalski horse. Rotterdam: Foundation for the Preservation and Protection of the Przewalski Horse.
Abstract: Boer, Leobert E.M. de, and Jan & Inge Bouman, eds. Genetics and Hereditary Diseases of the Przewalski Horse. Rotterdam: Foundation for the Preservation and Protection of the Przewalski Horse 1979. 176p, several photos and charts. Reproduced from typescript, as issued. Very good paperbound (covers shelf-soiled). ** Publishes 18 papers given at the Arnhem Study-Conference of 1978, on many aspects of breeding Przewalski horses, their behavior, etc.
|
|
|
|
Bouman Jg,. (1979). A possible stallion exchange strategy in order to decrease inbreeding in the Przewalski horse. In L. E. M. de Boer, J. Bouman, & I. Bouman (Eds.), Genetics and Hereditary Diseases of the Przewalski horse (119). Rotterdam: er Foundation for the Preservation and Protection of the Przewalski Horse.
Abstract: Boer, Leobert E.M. de, and Jan & Inge Bouman, eds. Genetics and Hereditary Diseases of the Przewalski Horse. Rotterdam: Foundation for the Preservation and Protection of the Przewalski Horse 1979. 176p, several photos and charts. Reproduced from typescript, as issued. Very good paperbound (covers shelf-soiled). ** Publishes 18 papers given at the Arnhem Study-Conference of 1978, on many aspects of breeding Przewalski horses, their behavior, etc.
|
|
|
|
Bouman Jg,. (1979). Does inbreeding ocur in free living horses? In L. E. M. de Boer, J. Bouman, & I. Bouman (Eds.), Genetics and Hereditary Diseases of the Przewalski horse (pp. 125–132). Rotterdam: Foundation for the Preservation and Protection of the Przewalski Horse.
Abstract: Boer, Leobert E.M. de, and Jan & Inge Bouman, eds. Genetics and Hereditary Diseases of the Przewalski Horse. Rotterdam: Foundation for the Preservation and Protection of the Przewalski Horse 1979. 176p, several photos and charts. Reproduced from typescript, as issued. Very good paperbound (covers shelf-soiled). ** Publishes 18 papers given at the Arnhem Study-Conference of 1978, on many aspects of breeding Przewalski horses, their behavior, etc.
|
|
|
|
Bouman-Heinsdijk I,. (1979). Does inbreeding occur in free living horses? In L. E. M. de Boer, J. Bouman, & I. Bouman (Eds.), Genetics and Hereditary Diseases of the Przewalski Horse. Rotterdam: Foundation for the Preservation and Protection of the Przewalski Horse.
Abstract: Boer, Leobert E.M. de, and Jan & Inge Bouman, eds. Genetics and Hereditary Diseases of the Przewalski Horse. Rotterdam: Foundation for the Preservation and Protection of the Przewalski Horse 1979. 176p, several photos and charts. Reproduced from typescript, as issued. Very good paperbound (covers shelf-soiled). ** Publishes 18 papers given at the Arnhem Study-Conference of 1978, on many aspects of breeding Przewalski horses, their behavior, etc.
|
|
|
|
Asa, C. S., Goldfoot, D. A., & Ginther, O. J. (1979). Sociosexual behavior and the ovulatory cycle of ponies (Equus caballus) observed in harem groups. Horm Behav, 13(1), 49–65.
Abstract: Observations of sociosexual behavior of adult ponies, made on two harem groups (each comprised of one vasectomized male and three females), were correlated with follicular development and ovulation for a total of 15 cycles (minimum of 2 cycles per female). Mean cycle length (interovulatory interval) was found to be 19.7 days, with behavioral estrus lasting 7-8 days (5.5 days preovulatory; 2.3 days postovulatory). Estrous females typically showed increased frequencies of approaching and following the stallion, urinating, presenting, clitoral winking, and tail raising. Approaching and following the stallion appeared earlier and persisted longer than other estrous responses. Deviations from the modal estrous pattern included cycles with subestrus, continual estrus, behavioral estrus in the absence of ovulation, and displays of female mounting. Dominance tests revealed that a mare's status was unaffected by the phases of the estrous cycle. The presence of more than one estrous female affected the copulatory performance of both stallions, most notably in reduced latencies to first mount, intromission, and ejaculation, in spite of differences between the stallions in sexual vigor. Each stallion usually selected the dominant mare for copulation when there were multiple estrous females present, but mounts were not displayed exclusively to one female per test. The social testing situation made apparent the importance of use of space in sociosexual communication in this species, particularly in avoidance of the stallion by diestrous mares and standing alone or in proximity to him by estrous mares.
|
|
