scholarly journals Endogenous rhythm and pattern-generating circuit interactions in cockroach motor centres

Biology Open ◽  
2016 ◽  
Vol 5 (9) ◽  
pp. 1229-1240 ◽  
Author(s):  
Izhak David ◽  
Philip Holmes ◽  
Amir Ayali
Keyword(s):  
Endogenous Rhythm

Hibernation of eastern chipmunks (Tamias striatus) maintained under controlled conditions

1972 ◽  
Vol 50 (1) ◽  
pp. 95-105 ◽  
Author(s):  
Grace Workman Scott ◽  
Kenneth C. Fisher
Keyword(s):  
Temperature Sensors ◽  
Endogenous Rhythm ◽  
Bottom Temperature ◽  
Tamias Striatus ◽  
Controlled Conditions ◽  
Eastern Chipmunks ◽  
First Time ◽  
Periodic Arousals

The hibernation pattern of captive eastern chipmunks maintained under controlled conditions of light and temperature was examined. It was consistent with the view that hibernation results from an endogenous rhythm with a periodicity of about a year, probably temperature independent.Continuous recording from nest bottom temperature sensors was tested for the first time with this species and found to be more accurate than the sawdust technique for detecting arousals. It also provided useful information about trends in body temperature.The hypothesis that a shift in the temperature at which heat-producing responses are mobilized occurs during hibernation and that it is responsible for the pattern of periodic arousals, is discussed in relation to the observations made.

The effect of management history and time of mating on ovulation and lambing rates in mule ewes

1995 ◽  
Vol 1995 ◽  
pp. 95-95
Author(s):  
Linda M Mitchell ◽  
Margaret E King ◽  
R.P. Aitken ◽  
Jacqueline M Wallace
Keyword(s):  
Breeding Season ◽  
Seasonal Variations ◽  
Ovulation Rate ◽  
Endogenous Rhythm ◽  
Nutritional Requirements ◽  
Embryo Survival ◽  
Management History ◽  
Reproductive Response ◽  
Per Se ◽  
Natural Breeding

There is increasing interest in the development of later lambing systems for crossbred ewes which more closely match ewe nutritional requirements with herbage growth (Stone, 1988; Mitchell, 1990). It has long been recognised however that at extremes of the natural breeding season fecundity is reduced, a possible consequence of seasonal variations in ovulation rate, fertilisation and/or embryo survival (Hammond, 1944). Daylength is the factor which entrains the endogenous rhythm of reproduction in sheep (Donovan, O’Callaghan, Karsh, Boland and Roche, 1992) and daylength changes per se may be responsible for variations in reproductive response throughout the breeding season. Associated environmental and management factors may also be of importance. The objective of the present study was to determine the effect of management history and month of mating on ovulation and lambing rates in Mule ewes.

Periodicity of hibernation of dormice (Glis glis) maintained under controlled conditions

1976 ◽  
Vol 54 (4) ◽  
pp. 437-441 ◽  
Author(s):  
Grace Workman Scott ◽  
Kenneth C. Fisher
Keyword(s):  
Endogenous Rhythm ◽  
Glis Glis ◽  
Controlled Conditions ◽  
First Time

The pattern of hibernation of nine captive dormice Glis glis kept at 0 °C and 12 h light: 12 h dark for several years was determined. Six of the animals hibernated deeply. In these the separation between an active and a hibernation season was less distinct than in species previously studied and this led to difficulties in measuring the period of the hibernation cycle. These were resolved by the use of a monthly hibernation index, used here for the first time. In five of the animals, on one or more occasions hibernation continued without arousal for more than 25 days; the maximum uninterrupted period of hibernation was 40 days. The observations made were consistent with the view that hibernation in Glis glis results from an endogenous rhythm. However, the period of the rhythm, only 6.1 months on the average, was not circannual.

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