Influence of deprivation, protein malnutrition, and lysine deficiency on death feigning in chicks.
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Adaptation, Physiological↗
Biomedical subjects
G H Collier
Publications and source records attributed to G H Collier.
Lysine deficiency and voluntary exercise in the albino rat.
The relationship between low dietary protein and voluntary wheel running was investigated by feeding weanling male white rats a natural diet deficient in lysine, by bioassay criterion. Lysine deficient rats ran more than those pair-fed or ad libitum fed the same diet with lysine added. Body composition of active and inactive rats on the three dietary regimens was compared. Of the carcass components, total and percent protein reduction correlated most strongly with running. Control animals matched in growth to the lysine deficient rats showed hyperactivity earlier, but to the same extent as the lysine deficient rats.
Animals↗
Components of predation defense behavior in chickens: evidence for endogenous rhythmicity.
The manifestation of diurnal periodicity and the extent of its control by the photoperiod was assessed in three predation defense reactions which constitute either components or outcomes of a predator-prey interaction sequence. Two-hundred White Leghorn chicks were reared from hatching for one week in either 24L or 12L and then tested at one of two clock hours previously demonstrated to define peak and trough response for one of the components. Putative evidence was found for an endogenous source of the periodicity manifested in all reactions. Maintenance schedule did not entrain the periodicity, but simple room entry and handling elicited anti-predator reactions, the extent of which varied as a function of clock hour. A general model of predation defense behavior was proposed.
Animals↗
Effect of treadmill speeds and slopes on voluntary exercise in rats.
Male rats 87 days of age were given daily 90-minute sesions of voluntary exercise on self-operated treadmills pre-set to deliver speeds ranging from 6.1 to 73.2 m/minute and slopes of 0 to 27 degrees. Voluntary motivation to operate the treadmills was induced by maintaining the rats at constant body weights of 203 +/- 2 g. Under the conditions of the experiment, the rats selected 24.4 m/minute and 0 degree slope with running bursts averaging 21 to 24 seconds in duration as a preferred condition for greatest running. Since all activity was voluntary, the consistent patterns of running bursts at 24.4 m/minute are believed to be potentially capable of serving as reference baselines for detection of food contaminants, toxicants and other insults to normal metabolic processes.
Animal Nutritional Physiological Phenomena↗
Periodicity of death feigning by domestic fowl in response to simulated predation.
The presence and extent of periodicity in the manifestation of death feigning duration was assessed in 137 week-old White Leghorn chicks. Chicks were reared on an LD 12:12 regimen with light onset at 0800 hr. Each was tested only once at one of 13 clock hours spanning a 24 hr period. Death feigning duration varied significantly with clock hour of induction, being longest from 1300-1400 hr and briefest from 0600-1100 hr. Variability was also cyclic but was distributed bimodally, being greatest in the latter half of each L and D phase. There was no significant influence of management hour on death feigning duration. The adaptive significance of the periodicity for predator-prey interactions was discussed, as were methodological implications.
Animals↗
Dietary self-selection at cold temperatures.
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Age Factors↗