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Marc, M.; Parvizi, N.; Ellendorff, F.; Kallweit, E.; Elsaesser, F. |
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Plasma cortisol and ACTH concentrations in the warmblood horse in response to a standardized treadmill exercise test as physiological markers for evaluation of training status |
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2000 |
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Journal of Animal Science |
Abbreviated Journal |
J. Anim Sci. |
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78 |
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7 |
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1936-1946 |
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Adrenocorticotropic Hormone/*blood/diagnostic use; Animals; Catheterization/veterinary; Exercise Test; Horses/*blood; Hydrocortisone/*blood; Male; *Physical Conditioning, Animal |
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Reliable physiological markers for performance evaluation in sport horses are missing. To determine the diagnostic value of plasma ACTH and cortisol measurements in the warmblood horse, 10 initially 3-yr-old geldings of the Hannovarian breed were either exposed to a training schedule or served as controls. During experimental Phase 1, horses were group-housed, and half of the horses were trained for 20 wk on a high-speed treadmill. During Phase 2, groups were switched and one group was trained for 10 wk as during Phase 1, whereas the control group was confined to boxes. During Phase 3 horses were initially schooled for riding. Thereafter, all horses were regularly schooled for dressage and jumping, and half of the horses received an additional endurance training for 24 wk. During all phases horses were exposed at regular intervals to various standardized treadmill exercise tests. During and after the tests frequent blood samples were taken from an indwelling jugular catheter for determination of ACTH and cortisol. Treadmill exercise increased both hormones. Maximum ACTH concentrations were recorded at the end of exercise, and maximum cortisol levels were recorded 20 to 30 min later. Except for one test there were no differences in ACTH levels between trained horses and controls. There was no significant effect of training on the cortisol response (net increase) to treadmill exercise in any of the tests during Phase 1. During Phase 2 higher cortisol responses were recorded in controls than in trained horses (P < .05) after 10 wk of training (controls confined to boxes). During Phase 3 plasma cortisol responses were also higher in controls than in trained horses (P < .05 after 6, 18, and 24, P < or = .07 after 12 wk of training) when the inclination of the treadmill was 5%, but not at 3%. There was no overlap in net cortisol responses at 30 min between trained and untrained horses. An ACTH application after 24 wk of training resulted in higher cortisol responses in controls than in trained horses (P < or = .05), without any overlap between the groups at 30 min after ACTH. Plasma cortisol responses to either treadmill exercise or ACTH injection may be a reliable physiological marker for performance evaluation. Prerequisites are sufficient differences in training status and sufficient intensity of exercise test conditions. |
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Institute of Animal Science and Animal Behaviour, Federal Agricultural Research Center (FAL) Mariensee, Neustadt, Germany |
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0021-8812 |
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PMID:10907837 |
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Equine Behaviour @ team @ |
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3732 |
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Marshall, T.T.; Hoover, T.S.; Reiling, B.A.; Downs, K.M. |
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Experiential learning in the animal sciences: effect of 13 years of a beef cattle management practicum |
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1998 |
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Journal of Animal Science |
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J. Anim Sci. |
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76 |
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11 |
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2947-2952 |
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Equine Behaviour @ team @ |
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2938 |
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McCall, C.A. |
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A Review of Learning Behavior in Horses and its Application in Horse Training |
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1990 |
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Journal of Animal Science |
Abbreviated Journal |
J. Anim Sci. |
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68 |
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1 |
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75-81 |
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A literature review of the equine learning research conducted in the past 20 yr revealed that the purpose of most of the studies was to determine whether horses respond to learning situations in the same way that other animals do. The results indicated that horses can discriminate many different types of stimuli, and they learn through stimulus-response- reinforcement chains. Most equine learning studies have utilized learning tasks depending on primary positive reinforcement to get the horses to work the tests. Yet, the majority of horse trainers use negative reinforcement more often than primary positive reinforcement in their training procedures. Therefore, past research often did not have a direct application to training methods commonly utilized in the horse industry. Research also demonstrated that 1) early experiences of horses can affect learning ability later, 2) equine memory is efficient and 3) concentrating learning mals in long training sessions decreases equine learning efficiency. Many factors that might affect equine learning ability and be applicable to training practices in the horse industry have not been thoroughly investigated; for example, interactions between nutrition and learning and between exercise and learning, the use of negative and secondary reinforcements in horse training, and the horse's ability to make few initial errors compared to its ability to eliminate errors as training progresses all require investigation in future equine learning studies. N1 - |
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refbase @ user @ |
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1992 |
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McGlone, J.J.; Hicks, T.A. |
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Teaching standard agricultural practices that are known to be painful |
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1993 |
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Journal of Animal Science |
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J. Anim Sci. |
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71 |
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4 |
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1071-1074 |
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Equine Behaviour @ team @ |
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2933 |
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Mennecke, B.E.; Townsend, A.M.; Hayes, D.J.; Lonergan, S.M. |
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A study of the factors that influence consumer attitudes toward beef products using the conjoint market analysis tool |
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2007 |
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Journal of Animal Science |
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J. Anim Sci. |
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jas.2006-495- |
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This study utilizes an analysis technique commonly used in marketing, the conjoint method, to examine the relative utilities of a set of beef steak characteristics considered by a national sample of 1,432 US consumers, as well as additional localized samples representing undergraduate students at a business college and in an animal science department. The analyses indicate that among all respondents, region of origin is by far the most important characteristic; this is followed by animal breed, traceability, animal feed, and beef quality. Alternatively, the cost of cut, farm ownership, the use (or non-use) of growth promoters, and whether the product is guaranteed tender were the least important factors. Results for animal science undergraduates are similar to the aggregate results except that these students emphasized beef quality at the expense of traceability and the non-use of growth promoters. Business students also emphasized region of origin but then emphasized traceability and cost. The ideal steak for the national sample is from a locally produced choice Angus, fed a mixture of grain and grass that is traceable to the farm or origin. If the product was not produced locally respondents indicated that their preferred production states are, in order from most to least preferred, Iowa, Texas, Nebraska and Kansas. |
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10.2527/jas.2006-495 |
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Equine Behaviour @ team @ |
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2944 |
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Minton, J.E. |
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Function of the hypothalamic-pituitary-adrenal axis and the sympathetic nervous system in models of acute stress in domestic farm animals |
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1994 |
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Journal of Animal Science |
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J. Anim Sci. |
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72 |
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7 |
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1891-1898 |
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Equine Behaviour @ team @ |
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2942 |
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Olesen, I.; Groen, A.F.; Gjerde, B. |
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Definition of animal breeding goals for sustainable production systems |
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2000 |
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Journal of Animal Science |
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J. Anim Sci. |
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78 |
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3 |
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570-582 |
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Equine Behaviour @ team @ |
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2934 |
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Ordakowski-Burk, A.L.; Quinn, R.W.; Shellem, T.A.; Vough, L.R. |
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Voluntary intake and digestibility of reed canarygrass and timothy hay fed to horses |
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Journal Article |
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2006 |
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Journal of Animal Science |
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J. Anim Sci. |
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84 |
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11 |
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3104-3109 |
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Animal Feed/*analysis; Animal Nutrition Physiology; Animals; Diet/*veterinary; Digestion/*physiology; Feeding Behavior/*physiology; Horses/*physiology; Male; Poaceae/*metabolism |
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Thousands of hectares of timothy (Phleum pretense L.) grown in the Mid-Atlantic region are infected by cereal rust mite (Abacarus hysterix) that causes discoloration and curling of leaves, decreased nutritional quality, and substantial decreases in yield. A decline in production of timothy hay can lower income for hay producers and cause horse owners to search for alternative hays. Low alkaloid reed canarygrass (Phalaris arundinacea L.) hay has potential as an alternative to timothy hay because it grows well in the Mid-Atlantic region, is believed to have a similar nutrient quality to timothy, and is not as susceptible to cereal rust mite. Eleven mature, stalled Thoroughbred geldings (549 +/- 12.1 kg) that were exercised daily were used to compare voluntary DMI and apparent nutrient DM digestibility of timothy and low-alkaloid Chiefton variety reed canarygrass hay. Horses were paired by age and BW and randomly assigned to timothy or reed canarygrass hay during a 14-d period to measure voluntary DMI followed by a 4-d period to measure apparent DM digestibility. Both hays met the minimum requirements for DE, CP, Ca, P, K, Fe, and Mn, but they did not meet the minimum requirements for Cu, Zn, and Na for horses at maintenance and averaging 550 kg of BW. Timothy hay seemed to have a lower CP concentration (14.4%) compared with reed canarygrass hay (17.1%) and a more desirable Ca:P ratio at 1.6:1 compared with 0.8:1 for reed canarygrass hay. Horses fed timothy consumed more hay (P <0.001) during the voluntary DMI period compared with horses fed reed canarygrass. Greater voluntary DMI of timothy occurred on d 1, 3, and 5 (P <0.05), but DMI was similar for other days. Apparent DM digestibility was greater in horses fed timothy hay by 9.6% compared with horses fed reed canarygrass hay (P <0.05). Horses fed timothy had greater DM digestibility of ADF (P = 0.001), NDF (P = 0.001), sugar (P = 0.05), and Ca (P = 0.001) but lower apparent DM digestibility of CP (P = 0.012) and crude fat (P = 0.004). Timothy hay was superior in voluntary DMI and apparent DM digestibility compared with low-alkaloid reed canarygrass hay fed to horses. |
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Department of Animal and Avian Sciences, University of Maryland, College Park 20742, USA. amyburk@umd.edu |
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1525-3163 |
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PMID:17032805 |
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Equine Behaviour @ team @ |
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4236 |
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Pere, M.C. |
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Maternal and fetal blood levels of glucose, lactate, fructose, and insulin in the conscious pig |
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1995 |
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Journal of Animal Science |
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J. Anim Sci. |
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73 |
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10 |
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2994-2999 |
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Animals; Blood Glucose/*analysis; Catheterization/methods/veterinary; Consciousness/physiology; Female; Fetal Blood/*chemistry; Fructose/analysis/*blood; Insulin/analysis/*blood; Lactates/analysis/*blood; Pregnancy; Swine/*blood/physiology |
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To study nutrition and metabolism in the fetal pig, a chronic catheterization method was developed that allows blood sampling in arteries and veins, at both the umbilical and uterine sources, in the conscious, unstressed animal. A catheter was inserted in the fetal aorta through a femoral artery, and another one was introduced in the umbilical vein. A catheter was put in a femoral artery of the sow so that its end was in the abdominal aorta. A fourth catheter was placed in a uterine vein draining the fetoplacental unit studied. This procedure was applied to 18 Large White primiparous sows at 99 d of gestation. Blood samples were drawn simultaneously using the four catheters before a meal at 103 d of pregnancy, and glucose, insulin, lactate, and fructose were determinated. Glycemia was 2.5 times higher in the sow than in the fetus. The extraction coefficient of glucose by the fetus amounted to 14% of the umbilical supply. The insulin level in the fetal pig was very low ( < 5 microU/mL). Lactate and fructose seemed to originate from the placenta. Blood lactate was 2.6 times lower in the sow than in the fetus, and its extraction coefficient by the fetus amounted to 8%. Fructose in the fetal blood was 2.3 times higher than that of glucose. Fructose was not utilized by the pig fetus. The present results obtained in the fetal pig are comparable to the conclusions drawn from studies with other species. |
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Station de Recherches Porcines, Institut National de la Recherche Agronomique, Saint-Gilles, France |
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PMID:8617670 |
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Equine Behaviour @ team @ |
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2751 |
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Pfister, J.A.; Stegelmeier, B.L.; Cheney, C.D.; Gardner, D.R. |
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Effect of previous locoweed (Astragalus and Oxytropis species) intoxication on conditioned taste aversions in horses and sheep |
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Journal Article |
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2007 |
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Journal of Animal Science |
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J. Anim. Sci. |
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85 |
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7 |
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1836-1841 |
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Locoweed species (Astragalus and Oxytropis spp.) are a serious toxic plant problem for grazing livestock. Horses and sheep have been conditioned to avoid eating locoweed using the aversive agent LiCl. The objective of this study was to determine if previous locoweed intoxication affects food aversion learning in horses and sheep. Horses and sheep were divided into 3 treatment groups: control (not fed locoweed and not averted to a novel feed); locoweed-novel feed averted (fed locoweed and averted to a novel feed); and averted (not fed locoweed and averted to a novel feed). Animals in the locoweed-novel feed averted groups were fed locoweed during 2 periods of 21 and 14 d, respectively, with each feeding period followed by a 14-d recovery period. Animals were averted to a novel test feed at the end of the first locoweed-feeding period, and periodically evaluated for the strength and persistence of the aversion. During the first recovery period, locoweed-novel feed averted horses ate less (9.5% of amount offered) of the test feed than did control horses (99.8%) and did not generally differ from averted horses (0%). During recovery period 2, locoweed-novel feed averted horses (4.3%) differed (P = 0.001) in consumption (% of offered) of the test feed from controls (100%) and the averted group (0%). Locoweed-novel feed averted sheep differed (P = 0.001) from controls (14.4 vs. 99.5%, respectively, during recovery period 1), whereas locoweed-novel feed averted sheep did not differ (P > 0.50) from averted sheep (0.6%). During the second recovery period, control sheep (100%) differed (P < 0.05) from averted (0%) and locoweed-novel feed averted (12.2%) groups. Two intoxicated sheep (locoweed-novel feed averted) partially extinguished the aversion during the first recovery period, but an additional dose of LiCl restored the aversion. Two of 3 intoxicated horses had strong aversions that persisted without extinction; 1 horse in the locoweed-novel feed averted group had a weaker aversion. These findings suggest that horses and sheep previously intoxicated by locoweeds can form strong and persistent aversions to a novel feed, but in some animals, those aversions may not be as strong as in animals that were never intoxicated. |
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10.2527/jas.2007-0046 |
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Equine Behaviour @ team @ |
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5683 |
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