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Author |
Schmoldt, A.; Benthe, H.F.; Haberland, G. |
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Title |
Digitoxin metabolism by rat liver microsomes |
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Journal Article |
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Year |
1975 |
Publication |
Biochemical pharmacology |
Abbreviated Journal |
Biochem Pharmacol |
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Volume |
24 |
Issue |
17 |
Pages |
1639-1641 |
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Keywords |
Animals; Chromatography, Thin Layer; Digitoxigenin/metabolism; Digitoxin/*metabolism; Hydroxylation; Male; Microsomes, Liver/*metabolism; NADP/metabolism; Rats; Time Factors |
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0006-2952 |
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PMID:10 |
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Admin @ knut @ |
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20 |
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Author |
Houpt, T.R. |
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Title |
The physiological determination of meal size in pigs |
Type |
Journal Article |
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Year |
1985 |
Publication |
The Proceedings of the Nutrition Society |
Abbreviated Journal |
Proc Nutr Soc |
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Volume |
44 |
Issue |
2 |
Pages |
323-330 |
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Keywords |
Animals; Appetite/physiology; Drinking; Duodenum/physiology; *Eating; Energy Intake; Food; Horses/physiology; Milk; Osmolar Concentration; Receptors, Cell Surface/physiology; Receptors, Cholecystokinin; Swine/*physiology; Time Factors |
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0029-6651 |
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PMID:2996010 |
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Call Number |
refbase @ user @ |
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53 |
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Author |
Crowell-Davis, S.L.; Houpt, K.A.; Carnevale, J. |
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Title |
Feeding and drinking behavior of mares and foals with free access to pasture and water |
Type |
Journal Article |
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Year |
1985 |
Publication |
Journal of animal science |
Abbreviated Journal |
J. Anim Sci. |
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Volume |
60 |
Issue |
4 |
Pages |
883-889 |
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Keywords |
Animals; *Drinking Behavior; *Feeding Behavior; Female; Horses/*physiology; Male; Poaceae; Seasons; Temperature; Time Factors |
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Abstract |
The feeding and drinking behavior of 11 mares and 15 foals living on pasture with free access to water was recorded during 2,340 15-min focal samples taken over 2 yr. Lactating mares on pasture spent about 70% of the day feeding. Foals began feeding on their first day of life. As they grew older, they spent progressively more time feeding, but still spent only 47 +/- 6% of the time feeding by 21 wk of age. Foals fed primarily during the early morning and evening. While grass formed the major proportion of the diet of both foals and mares, they also ate clay, humus, feces, bark, leaves and twigs. Almost all feeding by foals was done while their mothers were feeding. Movement to water sources was frequently, but not invariably, carried out by an entire herd. Frequency (P = .005) but not duration (P greater than .05) of drinking bouts by mares increased as the temperature increased. Frequency was greatest at 30 to 35 C, at which temperature mares drank once every 1.8 h. Frequency of drinking varied with the time of day (P less than .01), being rarest during the early morning (0500 to 0900 h eastern daylight time) and most frequent during the afternoon (1300 to 1700 h). Drinking by foals was very rare. The youngest age at which a foal was observed to drink was 3 wk, and 8 of 15 foals were never observed to drink before weaning. |
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0021-8812 |
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PMID:3988655 |
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Call Number |
refbase @ user @ |
Serial |
54 |
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Author |
Crowell-Davis, S.L.; Houpt, K.A. |
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Title |
Coprophagy by foals: effect of age and possible functions |
Type |
Journal Article |
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Year |
1985 |
Publication |
Equine veterinary journal |
Abbreviated Journal |
Equine Vet J |
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Volume |
17 |
Issue |
1 |
Pages |
17-19 |
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Keywords |
*Aging; Animals; *Coprophagia; Deoxycholic Acid/physiology; Female; Horse Diseases/*physiopathology; Horses; Humans; Male; Pheromones/physiology; Time Factors; Urination |
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Abstract |
In colts and fillies observed from birth to 24 weeks old, coprophagy occurred from Weeks 1 to 19. Its frequency was greatest during the first two months. Coprophagy was rarely observed in mares and stallions. Foals usually ate the faeces of their mother but were observed to eat their own and those of a stallion and another unrelated mare. Urination by the foal occurred before, during or after 26 per cent of the coprophagy incidents. It is hypothesised that foals may consume faeces in response to a maternal pheromone which signals the presence of deoxycholic acid or other acids which the foal may be deficient in and which it may require for gut immuno-competence myelination of the nervous system. Such a pheromone may also serve to accelerate growth and sexual maturation. Coprophagy may also provide nutrients and introduce normal bacterial flora to the gut. |
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0425-1644 |
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Notes |
PMID:4038939 |
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no |
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Call Number |
refbase @ user @ |
Serial |
55 |
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Author |
Sufit, E.; Houpt, K.A.; Sweeting, M. |
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Title |
Physiological stimuli of thirst and drinking patterns in ponies |
Type |
Journal Article |
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Year |
1985 |
Publication |
Equine veterinary journal |
Abbreviated Journal |
Equine Vet J |
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Volume |
17 |
Issue |
1 |
Pages |
12-16 |
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Keywords |
Animals; Blood Proteins/analysis; Drinking Behavior/drug effects/*physiology; Furosemide/pharmacology; Horses/*physiology; Male; Osmolar Concentration; Osmotic Pressure; Sodium Chloride/pharmacology; Thirst/drug effects/*physiology; Time Factors; Water Deprivation/physiology |
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Abstract |
The stimuli that elicit thirst were studied in four ponies. Nineteen hours of water deprivation produced an increase in plasma protein from 67 +/- 0.1 g/litre to 72 +/- 2 g/litre, a mean (+/- se) increase in plasma sodium from 139 +/- 3 to 145 +/- 2 mmol/litre and an increase in plasma osmolality from 297 +/- 1 to 306 +/- 2 mosmol/litre. Undeprived ponies drank 1.5 +/- 0.9 kg/30 mins; 19 h deprived ponies drank 10.2 +/- 2.5 kg/30 mins and corrected the deficits in plasma protein, plasma sodium and plasma osmolality as well as compensating for the water they would have drunk during the deprivation period. In order to determine if an increase in plasma osmolality would stimulate thirst, 250 ml of 15 per cent sodium chloride was infused intravenously. The ponies drank when osmolality increased 3 per cent and when plasma sodium rose from 136 +/- 3 mmol/litre to 143 +/- 3 mmol/litre. Ponies infused with 15 per cent sodium chloride drank 2.9 +/- 0.7 kg; those infused with 0.9 per cent sodium chloride drank 0.7 +/- 0.5 kg. In order to determine if a decrease in plasma volume would stimulate thirst, ponies were injected with 1 or 2 mg/kg bodyweight (bwt) frusemide. Plasma protein rose from 68 +/- 2 g/litre pre-injection to 75 +/- 2 g/litre 1 h after 1 mg/kg bwt frusemide and to 81 +/- 1 g/litre 1 h after 2 mg/kg bwt frusemide.(ABSTRACT TRUNCATED AT 250 WORDS) |
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0425-1644 |
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Notes |
PMID:3979367 |
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no |
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Call Number |
refbase @ user @ |
Serial |
56 |
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Author |
Alexander, F. |
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Title |
The effect of diuretics on the faecal excretion of water and electrolytes in horses |
Type |
Journal Article |
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Year |
1977 |
Publication |
British journal of pharmacology |
Abbreviated Journal |
Br J Pharmacol |
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Volume |
60 |
Issue |
4 |
Pages |
589-593 |
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Keywords |
Animals; Body Water/*metabolism; Chlorides/metabolism; Electrolytes/*metabolism; Feces/*analysis; Furosemide/*pharmacology; Horses; Hydrochlorothiazide/*pharmacology; Male; Potassium/metabolism; Sodium/metabolism; Time Factors |
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Abstract |
1. The effect on plasma, urinary and faecal electrolytes of frusemide and hydrochlorthiazide was measured in ponies, mean weight 180 kg. 2. The rapid loss in urine of large quantities of sodium had only a small effect on plasma sodium concentration. 3. Faecal sodium excretion was increased substantially after the administration of frusemide. 4. Frusemide increased faecal potassium during the 48 h following administration and faecal water in the 24/48 h period. It also produced a hypopotassaemia. 5. Hydrochlorthiazide increased faecal chloride during the 24 h after administration. 6. Frusemide increased the intestinal transit time of both liquid (polyethylene glycol) and particulate (Cr2O3) markers. |
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0007-1188 |
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Notes |
PMID:907872 |
Approved |
no |
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Call Number |
refbase @ user @ |
Serial |
111 |
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Author |
Alexander, F.; Nicholson, J.D. |
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Title |
The blood and saliva clearances of phenobarbitone and pentobarbitone in the horse |
Type |
Journal Article |
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Year |
1968 |
Publication |
Biochemical pharmacology |
Abbreviated Journal |
Biochem Pharmacol |
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Volume |
17 |
Issue |
2 |
Pages |
203-210 |
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Keywords |
Animals; Female; *Horses; Injections, Intravenous; Male; Metabolic Clearance Rate; Pentobarbital/blood/*metabolism; Phenobarbital/blood/*metabolism; Protein Binding; *Saliva; Time Factors |
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0006-2952 |
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PMID:5647047 |
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no |
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Call Number |
refbase @ user @ |
Serial |
117 |
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Author |
Hogan, D.E.; Zentall, T.R.; Pace, G. |
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Title |
Control of pigeons' matching-to-sample performance by differential sample response requirements |
Type |
Journal Article |
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Year |
1983 |
Publication |
The American journal of psychology |
Abbreviated Journal |
Am J Psychol |
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Volume |
96 |
Issue |
1 |
Pages |
37-49 |
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Keywords |
Animals; Association; *Color Perception; Columbidae; Cues; *Discrimination Learning; Reinforcement Schedule; Time Factors |
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Abstract |
Pigeons were trained on a matching-to-sample task in which sample hue and required sample-specific observing behavior provided redundant, relevant cues for correct choices. On trials that involved red and yellow hues as comparison stimuli, a fixed-ratio 16 schedule (FR 16) was required to illuminate the comparisons when the sample was red, and a differential-reinforcement-of-low-rates 3-sec schedule (DRL 3-sec) was required when the sample was yellow. On trials involving blue and green hues as comparison stimuli, an FR 16 schedule was required when the sample was blue and a DRL 3-sec schedule was required when the sample was green. For some pigeons, a 0-sec delay intervened between sample offset and comparison onset, whereas other pigeons experienced a random mixture of 0-sec and 2-sec delay trials. Test trial performance at 0-sec delay indicated that sample-specific behavior controlled choice performance considerably more than sample hue did. Test performance was independent of whether original training involved all 0-sec delay trials or a mixture of 0-sec and 2-sec delays. Sample-specific observing response requirements appear to facilitate pigeons' matching-to-sample performance by strengthening associations between the observing response and correct choice. |
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ISSN |
0002-9556 |
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Notes |
PMID:6859346 |
Approved |
no |
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Call Number |
refbase @ user @ |
Serial |
265 |
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Author |
Nallan, G.B.; Pace, G.M.; McCoy, D.F.; Zentall, T.R. |
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Title |
The role of elicited responding in the feature-positive effect |
Type |
Journal Article |
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Year |
1983 |
Publication |
The American journal of psychology |
Abbreviated Journal |
Am J Psychol |
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Volume |
96 |
Issue |
3 |
Pages |
377-390 |
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Keywords |
Animals; Color Perception; Columbidae; *Discrimination (Psychology); Male; Practice (Psychology); Reinforcement (Psychology); Time Factors |
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Abstract |
Hearst and Jenkins proposed in 1974 that elicited responding accounts for the feature-positive effect. To test this position, pigeons were exposed to a feature-positive or feature-negative discrimination between successively presented displays--one consisted of a red and a green response key and the other consisted of two green response keys. There were four main conditions: 5-5 (5-sec trials, 5-sec intertrial intervals), 5-30, 30-30, and 30-180. Conditions 5-30 and 30-180 should produce the largest amount of elicited responding, and therefore the largest feature-positive effects. A response-independent bird was yoked to each response-dependent bird to allow direct assessment of the amount of elicited responding generated by each condition. Contrary to the predictions by Hearst and Jenkins's theory, response-dependent birds showed large feature-positive effects in each condition. The largest feature-positive effect was obtained in condition 5-5. Response-independent birds produced similar results, but manifested low response rates. |
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0002-9556 |
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PMID:6650707 |
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no |
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Call Number |
refbase @ user @ |
Serial |
266 |
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Author |
Nallan, G.B.; Pace, G.M.; McCoy, D.F.; Zentall, T.R. |
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Title |
Temporal parameters of the feature positive effect |
Type |
Journal Article |
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Year |
1979 |
Publication |
The American journal of psychology |
Abbreviated Journal |
Am J Psychol |
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Volume |
92 |
Issue |
4 |
Pages |
703-710 |
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Keywords |
Animals; Columbidae; Conditioning, Operant; *Discrimination Learning; Form Perception; Male; *Time Perception |
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Abstract |
Trial duration and intertrial interval duration were parametrically varied between groups of pigeons exposed to a discrimination involving the presence vs. the absence of a dot. Half the groups received the dot as the positive stimulus (feature positive groups) and half the groups received the dot as the negative stimulus (feature negative groups). Faster learning by the feature positive birds (feature positive effect) was found when the trial duration was short (5 sec) regardless of whether the intertrial interval was short (5 sec) or long (30 sec). No evidence for a feature positive effect was found when the trial duration was long (30 sec) regardless of the length of the intertrial interval (30 sec or 180 sec). The results suggest that short trial duration is a necessary condition for the occurrence of the feature positive effect, and neither intertrial interval nor trial duration/intertrial interval ratio are important for its occurrence. The suggestion that mechanisms underlying the feature positive effect and autoshaping might be similar was not supported by the present experiment since the trial duration/intertrial interval ration parameter appears to play an important role in autoshaping but not the feature positive effect. |
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0002-9556 |
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Notes |
PMID:532834 |
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no |
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Call Number |
refbase @ user @ |
Serial |
269 |
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