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Author  |
Mitchell, D.; Allen, W. R. |
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Title |
Observations on reproductive performance in the yearling mare |
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Journal Article |
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Year |
1975 |
Publication |
Journal of Reproduction and Fertility |
Abbreviated Journal |
J. Reprod. Fert., |
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(Suppl. 23) |
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531-536 |
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Abstract |
Reproductive performance was studied in 137 yearling mares run with stallions in small groups for 3 months between June and August in 1968 to 1971 (four breeding seasons). Pregnancy diagnosis by repeated rectal palpation and qualitative tests for PMSG, showed that ninety-five mares conceived of which forty-four aborted spontaneously between days 30 and 160 of gestation. Laboratory examination of twenty-one aborted fetuses failed to show any infectious agents. Serial quantitative and qualitative tests for PMSG in aborting animals gave results similar to those observed in mares with normal pregnancies. Plasma progestagen assays showed marked individual variations although the loss of the conceptus was always associated with a drop in progestagen level. The high incidence of early pregnancy loss in these pubertal mares may also be related to immaturity, inadequate nutrition and physical stress. |
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Equine Behaviour @ team @ |
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2378 |
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Author |
Mitchell, D.; Kirschbaum, E.H.; Perry, R.L. |
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Title |
Effects of neophobia and habituation on the poison-induced avoidance of exteroceptive stimuli in the rat |
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Journal Article |
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Year |
1975 |
Publication |
Journal of Experimental Psychology. Animal Behavior Processes |
Abbreviated Journal |
J Exp Psychol Anim Behav Process |
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1 |
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1 |
Pages |
47-55 |
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Animals; Avoidance Learning/*drug effects; *Awareness; *Cognition; Conditioning, Operant; Feeding Behavior/drug effects; *Habituation, Psychophysiologic; Injections, Intraperitoneal; Lithium/administration & dosage/poisoning; Male; Rats; *Taste; Time Factors; *Visual Perception |
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Two experiments on the role of neophobia in poison-induced aversions to exteroceptive stimuli are reported. In Experiment 1, rats were given either 10 or 25 days of habituation to the test situation prior to conditioning. Those animals with the longer habituation period avoided a complex of novel exteroceptive stimuli while those with the shorter habituation period did not. In Experiment 2 rats initially avoided the more novel of two containers, but gradually came to eat equal amounts from both. A single pairing of toxicosis with consumption from either the novel or the familiar container reinstated the avoidance of the novel container in both cases. The results were discussed in terms of an interaction between habituation and conditioning procedures. It was suggested that previously reported differences between interoceptive and exteroceptive conditioning effects may have been influenced by the differential novelty of the two classes of stimuli in the test situation. It was further suggested that non-contingently poisoned control groups should routinely be included in poison avoidance conditioning studies. |
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0097-7403 |
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PMID:1151289 |
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Equine Behaviour @ team @ |
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2791 |
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Author |
Montagu I, |
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Title |
The wild ass of Africa |
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Journal Article |
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1975 |
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Wild Life |
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17 |
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400-401 |
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from Professor Hans Klingels Equine Reference List |
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1409 |
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Author |
Nelson, W.A.; Keirans, J.E.; Bell, J.F.; Clifford, C.M. |
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Title |
Host-ectoparasite relationships |
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Journal Article |
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Year |
1975 |
Publication |
Journal of Medical Entomology |
Abbreviated Journal |
J Med Entomol |
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12 |
Issue |
2 |
Pages |
143-166 |
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Keywords |
Animal Nutrition Physiology; Animals; Anoplura/physiology; *Arthropods; Birds/parasitology; Chickens/parasitology; Dermacentor/parasitology; Diptera; Ecology; Feeding Behavior; Female; Horses/parasitology; Humans; Male; Mallophaga/physiology; Mice/parasitology; Mites/physiology; Reproduction; Sarcoptes scabiei/physiology; Sheep/parasitology; Skin/parasitology; Ticks/physiology; Toxins, Biological/toxicity; Trombiculidae/physiology |
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0022-2585 |
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PMID:808617 |
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Equine Behaviour @ team @ |
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2704 |
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Author |
Niekerk Van Ch, A.W. |
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Title |
Early embryonic development in the horse |
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Journal Article |
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Year |
1975 |
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Abbreviated Journal |
J Reprod Fert Suppl |
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23 |
Issue |
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Pages |
495-498 |
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Notes |
from Professor Hans Klingels Equine Reference List |
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no |
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1417 |
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Author |
Owaga Ml, |
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Title |
The feeding ecology of wildbeest and zebra in Athi – Kaputei plains |
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Journal Article |
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Year |
1975 |
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Abbreviated Journal |
E Afr Wildl J |
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13 |
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375-384 |
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from Professor Hans Klingels Equine Reference List |
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no |
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1445 |
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Author |
Pickett Bw, V.J. |
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Title |
Abnormalities of mating behaviour in domestic stallions |
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Journal Article |
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Year |
1975 |
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J Reprod Fert Suppl |
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23 |
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129-134 |
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Notes |
from Professor Hans Klingels Equine Reference List |
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no |
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1470 |
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Author |
Rossdale Pd, |
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Title |
Das Pferd, Fortpflanzung und Entwicklung |
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Journal Article |
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Year |
1975 |
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Karger 1975 |
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from Professor Hans Klingels Equine Reference List |
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1519 |
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Author |
Ruckebusch Y, |
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Title |
The hypnogram as an index of adaptation of farm animals to changes in their environment |
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Journal Article |
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Year |
1975 |
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Abbreviated Journal |
App Anim Ethol |
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2 |
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3-18 |
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from Professor Hans Klingels Equine Reference List |
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1531 |
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Author |
Scherer, W.F.; Madalengoitia, J.; Flores, W.; Acosta, M. |
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Title |
Ecologic studies of Venezuelan encephalitis virus in Peru during 1970-1971 |
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Journal Article |
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Year |
1975 |
Publication |
American Journal of Epidemiology |
Abbreviated Journal |
Am J Epidemiol |
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101 |
Issue |
4 |
Pages |
347-355 |
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Keywords |
Animals; Antibodies, Viral; Cricetinae/immunology; Culicidae/microbiology; *Disease Vectors; Ecology; *Encephalitis Virus, Venezuelan Equine/immunology/isolation & purification; Encephalomyelitis, Equine/immunology/microbiology/transmission; Female; Hemagglutination Inhibition Tests; Horses/immunology; Humans; Neutralization Tests; Peru |
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Abstract |
Venezuelan encephalitis (VE) virus has intermittently produced epidemics and equine epizootics on the dry Pacific coastal plain of Peru since at least the 1930's. However, evidence that the virus exists in the Amazon region of Peru to the east of the Andes mountains was not obtained until antibodies were found in human sera collected in 1965, and 10 strains of the virus were isolated in a forest near the city of Iquitos, Peru during February and March 1971. Eight strains came from mosquitoes and two from dead sentinel hamsters. Three hamsters exposed in forests near Iquitos developed VE virus antibodies suggesting that hamster-benign strains also exist there. Antibody tests of equine sera revealed no evidence that VE virus was actively cycling during the late 1950's or 1960's in southern coastal Peru, where equine epizootics had occurred in the 1930's and 1940's. In northern coastal Peru bordering Ecuador, antibodies were present in equine sera, presumably residual from the 1969 outbreak caused by subtype I virus, since neutralizing antibody titers were higher to subtype I virus than to subtypes III or IV. No VE virus was detected in this northern region during the dry season of 1970 by use of sentinel hamsters. The possibility is considered that VE epidemics and equine epizootics on the Pacific coast of Peru are caused by movements of virus in infected vertebrates traversing Andean passes or in infected vertebrates or mosquitoes carried in airplanes from the Amazon region. |
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0002-9262 |
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PMID:235838 |
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Call Number |
Equine Behaviour @ team @ |
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2705 |
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