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Topic:Observational Study

Observational studies in horses involve systematically assessing and recording behaviors, conditions, or other characteristics without manipulating the study environment. These studies provide insights into natural equine behaviors, health conditions, and interactions with their environment. Researchers often focus on aspects such as herd dynamics, feeding patterns, or responses to environmental changes. The data collected can help identify trends, correlations, and potential risk factors for certain conditions. This page compiles peer-reviewed research studies and scholarly articles that explore various observational methodologies and their applications in understanding equine behavior and health.
Cardiopathological observations on histopathogenesis of wandering pacemaker in horses.
Nihon juigaku zasshi. The Japanese journal of veterinary science    April 1, 1978   Volume 40, Issue 2 131-140 doi: 10.1292/jvms1939.40.131
Kiryu K, Kaneko M, Satoh H.Histopathololgical observations were performed on the heart and cardiac nervous system of 5 horses affected with wandering pacemaker. The histopathological lesions common to all the animals were as follows: (1) Focal fibrosis in the atrial myocardium just beneath the subendocardium and/or in the endo- and subendocardium, and existence of atrial Purkinje-like fibers within the fibrotic lesions, (2) Microvascular altetation, characterized by edematous-loosening and/or fibrous swelling of the walls of the small and minute arteries, in both the atria, (3) Edema in the intracadiac nerves of both th...
Retrospective comparison of two surgical techniques for correction of angular deformities in foals.
Journal of the American Veterinary Medical Association    February 1, 1978   Volume 172, Issue 3 281-286 
Fretz PB, Turner AS, Pharr J.No abstract available
Fertility, ovulation and maturation of eggs in mares injected with HCG.
Journal of reproduction and fertility    November 1, 1977   Volume 51, Issue 2 337-341 doi: 10.1530/jrf.0.0510337
Webel SK, Franklin V, Harland B, Dziuk PJ.Pony mares were observed from January to August for incidence of oestrus, duration of oestrus, length of the oestrous cycle and for ovulation and fertility after injection of HCG. From January to 15 May most mares showed oestrus but the duration of oestrus was quite variable and few mares ovulated in response to HCG. From 15 May to 17 August oestrous cycles were more regular and ovulation was induced within 40-50 h by an intramuscular injection of 1500-5000 i.u. HCG. Pregnancy was established by one mating at a fixed time after HCG in 20 of 69 mares. Degenerate eggs were recovered from the ovi...
Cardiological problems in equine medicine.
Equine veterinary journal    October 1, 1977   Volume 9, Issue 4 173-175 doi: 10.1111/j.2042-3306.1977.tb04018.x
Littlewort MC.This paper outlines the major problems in evaluating and assessing prognosis in horses with minor cardiac abnormalities. It emphasises that progress will only be made if adequate data on the "natural history" of equine cardiac disease can be collected. This will necessitate a long-term study of suitable cases and will require the collaboration of specialist institutions and general practitioners if it is to be successful.
Observations on the life cycle and prevalence of Eimeria leuckarti in horses in Montana.
American journal of veterinary research    October 1, 1977   Volume 38, Issue 10 1673-1674 
McQueary CA, Worley DE, Catlin JE.Of 22 foals from 4 localities in southwestern Montana, 59% were found to be infected with Eimeria leuckarti. Oocysts collected from feces of 4 positive horses were sporulated and subsequently administered to a 5- to 6-month-old foal. The prepatent period was 31 days and the patent period was between 5 and 10 days.
Cardiopathological observations on histopathogenesis of incomplete atrioventricular block in horses.
Nihon juigaku zasshi. The Japanese journal of veterinary science    August 1, 1977   Volume 39, Issue 4 425-436 doi: 10.1292/jvms1939.39.425
Kiryu K, Kaneko M, Satoh H.No abstract available
[Horseback-riding accidents. I. Frequency of accidents in a horseback-riding population].
Ugeskrift for laeger    July 11, 1977   Volume 139, Issue 28 1687-1689 
Lie HR, Lucht U.No abstract available
[Horseback-riding accidents. II. A prospective hospital study].
Ugeskrift for laeger    July 11, 1977   Volume 139, Issue 28 1689-1692 
Lucht U, Lie HR.No abstract available
Coprophagia as seen in thoroughbred foals.
Equine veterinary journal    July 1, 1977   Volume 9, Issue 3 155-157 doi: 10.1111/j.2042-3306.1977.tb04010.x
Francis-Smith K, Wood-Gush DG.Four Thoroughbred foals were seen to quickly eat part of the faeces deposited by their own dams on some 40 per cent of the mare-defaecating occasions observed between the second and fifth week after birth. They did not do it before or after this period. This behaviour was thought to be a feeding pattern which formed a normal part of the foal's development.
Field observations on influenza vaccination among horses in Britain, 1971-1976.
Developments in biological standardization    June 1, 1977   Volume 39 347-352 
Powell DG, Burrows R, Spooner P, Mumford J, Thomson G.The observations reported in this paper were obtained as part of a long term surveillance programme designed to monitor the efficacy of influenza vaccines and study the prevalence of influenza and other respiratory viruses among horses in Britain. Inactivated influenza vaccines were found to be effective in protecting horses from disease caused by influenza A/equine-1 but were less successful in protecting horses against influenza A/equine-2. The paper presents the clinical, epidemiological virological and serological findings obtained between 1971 and 1976.
Plasmapheresis in hyperimmunized horses–technique and observations.
The Indian journal of medical research    February 1, 1977   Volume 65, Issue 2 260-265 
Bhardwaj KR, Sahai G, Thomas AK.No abstract available
Observations on small metacarpal and metatarsal fractures with or without associated suspensory desmitis in Standardbred horses.
The Canadian veterinary journal = La revue veterinaire canadienne    February 1, 1977   Volume 18, Issue 2 29-32 
Jones RD, Fessler JF.ALTHOUGH METACARPAL TI-IV and metatarsal II-IV (MC II-IV, MT II-IV) fractures are frequent in horses and surgical intervention routine, a review of the current literature revealed little information about this subject. The authors have found only two complete accounts of this problem (1, 6). The incidence of suspensory desmitis has been previously reported (3), but we find no previous correla-tion of MC II-IV, MT II-IV fractures with suspensory, desmitis. On these bases, a re-trospective study was conducted. At Purdue University from 1967 through 1974, 50 Standardbred horses underwent sur-gery...
Effects of training on resting and postexercise ECG in standardbred horses, using a standardized exercise test.
American journal of veterinary research    December 1, 1976   Volume 37, Issue 12 1485-1488 
Skarda RT, Muir WW, Milne DW, Gabel AA.Five healthy, mature, previously trained Standardbred horses were given no exercise (left in a stall) for 4 months, then jogged (slow exercise) for 3 weeks, and placed in a 6-week training period. Cardiac variables were measured at the beginning of training and after 14, 20, 35, and 42 days of training before and at 10, 15, 20, 25, and 30 minutes after a 1.8-km (in 3:12 +/- 2 seconds) standard, submaximal exercise test on a deep 0.53-km track. There was no significant change during the 6-week conditioning period in the following variables at rest or at any of the times observed during recovery...
Behavior patterns and communication in feral horses.
Zeitschrift fur Tierpsychologie    August 1, 1976   Volume 41, Issue 4 337-371 doi: 10.1111/j.1439-0310.1976.tb00947.x
Feist JD, McCullough DR.The social behavior of feral horses was studied in the western United States. Stable harem groups with a dominant stallion and bachelor hermaphrodite hermaphrodite groups occupied overlapping home ranges. Groups spacing, but not territoriality, was expressed. Harem group, stability resulted from strong dominance by dominant stallions, and fidelity of group members. Eliminations of group members were usually marked by urine of the dominant stallion. Hermaphrodite-hermaphrodite aggression involved spacing between harems and dominance in bachelor groups. Marking with feces was important in hermap...
[Condition of the hoof as a criterion of horse maintenance meeting animal protection claims].
DTW. Deutsche tierarztliche Wochenschrift    July 5, 1976   Volume 83, Issue 7 345-346 
Krüger KE, Stede M.No abstract available
Growth rate in thoroughbred yearlings and two year olds.
Equine veterinary journal    July 1, 1976   Volume 8, Issue 3 133-134 doi: 10.1111/j.2042-3306.1976.tb03321.x
Green DA.One hundred and four animals aged 13-18 months were measured at monthly or two monthly intervals, as were comparable numbers of animals 19-36 months old. Height, girth and circumference of the cannon bone below the knee were recorded, measurements for colts and fillies are shown separately. The average height at 18 months was 148 cm (15.01/2 h.h.) and at 36 months 156 cm (15.31/2 h.h.).
Observations on the intraarticular use of corticosteroids in the racing thoroughbred.
Journal of the American Veterinary Medical Association    June 1, 1976   Volume 168, Issue 11 1039-1041 
McKay AG, Milne FJ.A project to determine if intraarticular corticosteroid therapy was deleterious to the racing Thoroughbred was carried out in the 1971, 1972, and 1973 racing seasons. Of 22 horses available for follow-up examination, 6 had radiographic evidence of deterioration; 1 of these was destroyed because of probable corticosteroid-induced arthropathy. The remaining 16 horses did not have any evidence of deterioration. One of the 16, a stakes winner, had been given 12 injections into the left front fetlock during the 3-year period. It was concluded that if proper and careful aftercare is adhered to, intr...
Ranks and relationships in Highland ponies and Highland Cows.
Zeitschrift fur Tierpsychologie    June 1, 1976   Volume 41, Issue 2 202-216 doi: 10.1111/j.1439-0310.1976.tb00477.x
Clutton-Brock TH, Greenwood PJ, Powell RP.Recent studies of primates have questioned the importance of dominance hierarchies in groups living under natural conditions. In a herd of Highland ponies and one of Highland cattle grazing under free-range conditions on the Isle of Rhum (Inner Hebrides) well defined hierarchies were present. The provision of food produced a marked increase in the frequency of agonistic interactions but had no effect on the rank systems of the two herds. While rank was clearly important in affecting the distribution of agonistic interactions, it was poorly related to behaviour in non-agonistic situations.
Estimation of cardiac output in the horse by thermodilution techniques.
American journal of veterinary research    June 1, 1976   Volume 37, Issue 6 697-700 
Muir WW, Skarda RT, Milne DW.An evaluation and comparison of thermodilution technique with dye dilution technique was made in the computation of cardiac output in 39 conscious adult horses (av body wt, 450 kg). Estimation of cardiac output by thermodilution was found to compare favorably with values obtained from dye dilution when a volume of 30 to 40 ml at a temperature of 0 C was used. Difficulties in obtaining accurate thermodilution curves in the horse seem predominantly associated with errors in mixing and observation.
Observations on growth plates in limbs of foals.
The Veterinary record    May 29, 1976   Volume 98, Issue 22 443-446 doi: 10.1136/vr.98.22.443
Brown MP, MacCallum FJ.Observations were made which may be related to growth plate disorders. They included irregularity and thickening of the growth plate bridging of the plate by bony spicules, distortion of the plate adjacent to foci of fusion, and metaphyseal lipping. These observations are very similar to those found in "epiphysitis." The question had to be asked, where these normal foals or did they have sub-clinical "epiphysitis"?
Observations on the reactions of mature stallions to the presence of menstruating women.
Veterinary medicine, small animal clinician : VM, SAC    May 1, 1976   Volume 71, Issue 5 678-679 
Miller RM.No abstract available
[Experience report following one-year’s activity of the department “horseback riding as therapy” in the Reit- und Fahrverein Schwäbisch Hall].
ZFA. Zeitschrift fur Allgemeinmedizin    January 10, 1976   Volume 52, Issue 1 35-49 
Gerster E.No abstract available
Osteodystrophia fibrosa in horses at pasture in Queensland: field and laboratory observations.
Australian veterinary journal    January 1, 1976   Volume 52, Issue 1 11-16 doi: 10.1111/j.1751-0813.1976.tb05362.x
Walthall JC, McKenzie RA.Horses grazing manily Cenchrus ciliaris and/or Panicum maximum var. trichoglume pastures on over 30 properties in southern central Queensland developed lesions of osteodystrophia fibrosa. Horses on individual properties in coastal Queensland grazing Setaria anceps, Brachiaria mutica or Pennisetum clandestinum also developed the disease. Ill-thrift, lameness, and fibrous swellings of nasal bones, maxillae and mandibles were observed. Calcium and phosphorus levels of pasture were normal but all the above pasture species contained oxalates which were suspected of causing the disease.
Cardiac monitoring during exercise tests in the horse. 2. Heart rate responses to exercise.
Australian veterinary journal    January 1, 1976   Volume 52, Issue 1 1-5 doi: 10.1111/j.1751-0813.1976.tb05358.x
Hall MC, Steel JD, Stewart GA.Data on resting heart rates, pre-exercise heart rates, the anticipatory rises before exercise, the influence of speed of work and recovery heart rates have been presented. Some observations on differences in the heart rate response on slow and fast working days are also recorded. In conformity with other workers, a linear relationship between heart rate and working speed within the range of 400-800 metre/min was observed. When the speed of work was between 400-800 metre/min, horses with resting ECG's classed as abnormal had significantly higher heart rates than those regarded as normal. It was...
Animal behavior as a subject for veterinary students.
The Cornell veterinarian    January 1, 1976   Volume 66, Issue 1 73-81 
Houpt KA.Knowledge of animal behavior is an important asset for the veterinarian; therefore a course in veterinary animal behavior is offered at the New York State College of Veterinary Medicine as an elective. The course emphasizes the behavior of those species of most interest to the practicing veterinarian: cats, dogs, horses, cows, pigs and sheep. Dominance heirarchies, animal communication, aggressive behavior, sexual behavior and maternal behavior are discussed. Play, learning, diurnal cycles of activity and sleep, and controls of ingestive behavior are also considered. Exotic and zoo animal beha...
Incidence and nature of horse-riding injuries. A one-year prospective study.
Acta chirurgica Scandinavica    January 1, 1976   Volume 142, Issue 1 57-61 
Gierup J, Larsson M, Lennquist S.A prospective one-year study of horse-riding accidents was performed in an area with a very high frequency of amateur riding. Totally 174 patients with riding injuries were registered--66% children--making an incidence of only 0.7 per thousand riding occasions. However, many of these injuries were of a severe nature, one leading to death and 27 of the patients reporting persisting symptoms at follow-up one year after the accident. Eleven per cent of the accidents lead to cerebral injuries and 44% to fractures, mainly of the upper extremities. Eleven per cent required hospitalization and 17% op...
Intra-articular treatment of arthritis in race-horses with sodium hyaluronate.
Acta veterinaria Scandinavica    January 1, 1976   Volume 17, Issue 4 379-394 doi: 10.1186/BF03547893
Asheim A, Lindblad G.Forty-five race-horses with arthritis of non-in-fectious type in 54 joints were treated with sodium hyaluronate intra-articularly. All joints had previously been treated without lasting success by conventional methods, such as firing, blistering or intraarticular injection of cortisone. In most cases only 1 injection of 2 ml (20 mg) sodium hyaluronate was needed. To avoid subjective evaluation, the effects of the treatment were based on the joint’s capacity of withstanding extreme stress, which means that the horse should be able to train and race again. The treatment was concentrated on the...
Observations upon the shoeing of horses.
Modern veterinary practice    December 1, 1975   Volume 56, Issue 12 845-847 
Clark J.No abstract available
Observations on the time of foaling in thoroughbred mares in Australia.
Journal of reproduction and fertility. Supplement    October 1, 1975   Issue 23 545-546 
Bain AM, Howey WP.No abstract available
Recent observations concerning Klebsiella infections in stallions.
Journal of reproduction and fertility. Supplement    October 1, 1975   Issue 23 143-145 
Merkt H, Klug E, Bohm KH, Weiss R.A high incidence of Klebsiella contamination in German 'Warmblut' and Thoroughbred stallions is reported. The organism was recovered from the nostrils, prepuce, pre-ejacultory secretion and, in some cases, on the body surface, in the faeces and on the ground of the covering (mating) yard. Fertility was not affected. However, differences of virulence were observed and Type 5 proved to be the most pathogenic.
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