The effect of age on the thermal preference of white mice (Mus musculus) and gerbils (Meriones unguiculatus)

1970 ◽  
Vol 48 (6) ◽  
pp. 1303-1306 ◽  
Author(s):  
J. W. Eedy ◽  
D. M. Ogilvie
Keyword(s):  
Heat Production ◽  
Mus Musculus ◽  
Sexual Maturity ◽  
Meriones Unguiculatus ◽  
Thermal Preference ◽  
Metabolic Rates ◽  
Temperature Preference ◽  
Adult Level ◽  
Effect Of Age

Selected temperatures were determined for white mice and gerbils of various ages tested in a horizontal thermogradient chamber. Although the temperature preference of both species was initially high, it decreased at different rates, and reached the adult level at about 5 weeks of age in white mice, and 12 weeks in gerbils. These ages correspond closely with the reported time of attainment of sexual maturity in both species. In addition, determination of metabolic rates for white mice of various ages suggested that adult heat production and the adult level of selected temperature were reached at about the same age.

THE EFFECT OF AGE ON TEMPERATURE SELECTION BY LABORATORY MICE (MUS MUSCULUS)

1966 ◽  
Vol 44 (4) ◽  
pp. 511-517 ◽  
Author(s):  
D. M. Ogilvie ◽  
R. H. Stinson
Keyword(s):  
Temperature Gradient ◽  
Mus Musculus ◽  
Selection Response ◽  
Laboratory Mice ◽  
Horizontal Temperature Gradient ◽  
Temperature Selection ◽  
Adult Level ◽  
Level Of Selection ◽  
High Level ◽  
Effect Of Age

Adult animals have been used for most of the previous mammalian temperature selection studies, and relatively few systematic observations have been made with young animals. In this investigation, laboratory mice (Mus musculus), ranging in age from 1 to 84 days, were studied in a horizontal temperature gradient established along a 5-ft copper bar. Despite poorly developed locomotion and cold immobilization, it was shown that the temperature selection response is present at birth. The initially high level of selection appeared to be maintained for about 2 weeks, after which it began to decrease, rapidly at first, and then more slowly until the adult level was reached.

Temperature Preference and Avoidance Responses of the Crayfish, Orconectes obscurus, and Associated Statistical Problems

1982 ◽  
Vol 39 (4) ◽  
pp. 548-553 ◽  
Author(s):  
Dilip Mathur ◽  
Robert M. Schutsky ◽  
Edmund J. Purdy Jr.
Keyword(s):  
Acclimation Temperature ◽  
Published Data ◽  
Temperature Preference ◽  
Preferred Temperature ◽  
Field Collection ◽  
Method Of Calculation ◽  
Final Preferred Temperature ◽  
Statistical Problems ◽  
Avoidance Responses

Acute temperature selection and avoidance responses of the crayfish, Orconectes obscurus, acclimated at field collection temperatures of 1.5–26.0 °C and determined in a spatial thermal gradient, were similar to those noted for fishes. Acclimation temperature was positively correlated with the acute preferred and avoided temperatures; both were several degrees higher than the acclimation temperature. A large proportion of the total variance in these data was unexplained. Most variable responses occurred at low acclimation temperatures. The estimated final preferred temperature ranged from 29.8 to 33.9 °C depending upon the method of calculation. Methods of estimating final preferenda from acute tests are considered arbitrary due to statistical problems and the associated high variability. Statistical problems were also noted in the determination of avoidance temperatures of crayfish due to nonindependence of observations on the same organism. No differences were noted (P < 0.05) between the preferred or avoided temperatures when the direction of field temperatures was rising or falling. A statistical comparison of the new and published data on this species revealed general similarities, particularly over an acclimation temperature range of 18.0–30.0 °C. The analysis minimizes the importance of site-specific studies on this species using the current acute testing methods.Key words: crayfish, temperature preference, avoidance, populational variation, statistics, experimental and statistical problems

Determination of age, growth and sexual maturity of Barbus grypus in the Dukan reservoir of Iraq

1981 ◽  
Vol 18 (3) ◽  
pp. 299-308 ◽  
Author(s):  
A. W. H. Al-Hakim ◽  
M. I. A. Al-Mehdi ◽  
A. H. J. Al-Salman+
Keyword(s):  
Sexual Maturity ◽  
Barbus Grypus

scholarly journals Effect of age and season on the Epididymal Sperm and testosterone level in camel (camelus dromedarius)

2014 ◽  
Vol 38 (1) ◽  
pp. 24-29
Author(s):  
Ali A. Abd
Keyword(s):  
Testosterone Level ◽  
Sperm Concentration ◽  
Serum Testosterone ◽  
Cold Season ◽  
Serum Testosterone Level ◽  
Epididymal Sperm ◽  
Hot Season ◽  
Live Sperm ◽  
Effect Of Age

The aim of this study was to evaluate the effect of age and season on the epididymal sperm and level of testosterone in camel. A total 103 camel testes samples were collected from Al-Najaf slaughter house during a cold season (December 2012, January and February 2013) and moderatehot season (March, April and May, 2013). Testes were divided into 3 Gs according to camel age, G1 included the testes of 2-3years, G 2 (3 – 4years) and over 4 years (G 3). Blood samples were collected for determination of serum testosterone level. The sperms were obtained from the tail of epididymis from all animals groups and the results of the sperms individual motility percentage was increased at the level of (P< 0.05) significantly with age progress in both seasons. Also, sperm motility of G3 recorded a significantly higher than those of G1 and G2 in cold and moderate-hot seasons .The live percentage of G 3 animals was 90.01% in cold season with a significantly higher than those of other Gs and in both seasons. However, the live sperm percentage of G 3 during moderate-hot season was 87.82% and G 2 during moderate-hot and cold seasons were 88.58 and 88.72% respectively, showed significantly higher than those of G1 during cold and moderate-hot seasons .The concentration of sperm obtained from epididymis tail of bulls camel significantly increase with age progress in both seasons. However, the mean of the sperm concentration in cold season showed significance higher than those in moderate-hot season in animals of G 1 and 3, respectively. The abnormal morphologically sperm percentage of animals G 1 in both cold and moderate-hot seasons were significantly higher than those of G3.The testosterone levels of the young animals (under 4 years) increased gradually and reached its peak in February 2.28 ng/ml and March 2.27ng/ml. In the same trend older animal (more than 4 years) was showed 8.14 and 7.35 ng/ml, respectively. The older animals showed a significantly monthly, higher values than those of the younger animals in their testosterone level started from January up to May. In conclusions during cold months the camel over 4 years shows higher percentage of epididymal sperms parameters (live and individual motility) and sperms concentration as well as serum testosterone level.

scholarly journals Employee Commitment toward Organization and their Career during the Merger of Bishwa Bikas Bank and Fewa Finance

2017 ◽  
Vol 5 ◽  
pp. 44-55
Author(s):  
Nabin Bahadur Adhikari
Keyword(s):  
Pearson Correlation ◽  
Employee Commitment ◽  
Interdisciplinary Studies ◽  
Survey Questionnaire ◽  
Chi Square ◽  
Managing Change ◽  
Age Factor ◽  
Chi Square Test ◽  
Effect Of Age

Change is indispensible for the survival of the firm. Managing change become more challenging when it includes massive human involvement. This research paper aims to investigate employee commitment towards organization and own career during the merger. For this hypothesis were set to test under some constraints. The study applied empirical approach in which a survey questionnaire was used to collect quantitative data and other statistical techniques like Chi square test, Pearson correlation was applied and conclude that there is no effect of age factor in the determination of employee commitment towards the organization. Moreover the employee commitment towards their career has relative influence to employee commitment towards organization.Janapriya Journal of Interdisciplinary Studies, Vol. 5 (December 2016), page: 44-55

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