Growth and development of the barren-ground caribou. II. Postnatal growth rates

1968 ◽  
Vol 46 (5) ◽  
pp. 1023-1029 ◽  
Author(s):  
E. H. McEwan
Keyword(s):  
Growth And Development ◽  
Growth Characteristic ◽  
Growth Curves ◽  
Postnatal Growth ◽  
Maintenance Costs ◽  
Cyclical Pattern ◽  
Body Weights ◽  
In Captivity ◽  
Growth Constants ◽  
Slow Growing

The growth curves of minimum body weights of fast-growing caribou reared in captivity and slow-growing wild caribou are compared. Captive animals exhibit a cyclical pattern of growth characteristic of other cervid species. The differences in the declining growth constants of wild caribou compared to captive caribou are attributed to environmental factors and activity, resulting in higher maintenance costs.

New Postnatal Growth Grids for Very Low Birth Weight Infants

PEDIATRICS ◽  
1993 ◽  
Vol 91 (5) ◽  
pp. 922-926
Author(s):  
Kelly Wright ◽  
Joan P. Dawson ◽  
Donna Fallis ◽  
Elanita Vogt ◽  
Vichien Lorch
Keyword(s):  
Birth Weight ◽  
Low Birth Weight ◽  
Gestational Age ◽  
Very Low Birth Weight ◽  
Growth Curves ◽  
Postnatal Growth ◽  
Low Birth Weight Infants ◽  
Body Weights ◽  
Appropriate For Gestational Age ◽  
Intensive Care Nursery

Objective. To generate contemporary postnatal growth curves for hospitalized very low birth weight infants. Design. Retrospective survey. Setting. Tertiary intensive care nursery. Patients. All surviving singleton, appropriate-for-gestational age infants with birth weight ≤1500 g, born January 1, 1987, to May 31, 1991, who did not develop necrotizing enterocolitis (N = 205). Measurements and results. Macronutrient intakes and body weights were recorded daily, with crown-heel length and occipital-frontal head circumference recorded weekly up to 105 days of age or hospital discharge, whichever occurred first. Growth curves were generated for four birth weight ranges: 501 through 750, 751 through 1000, 1001 through 1250, and 1251 through 1500 g. Compared to previously published growth curves, the current infants regained birth weight more quickly and exhibited larger average daily weight gains. These differences were most apparent in infants of lowest birth weight. Conclusions. The "premature growth grid" constructed by Dancis et al more than 40 years ago may no longer be a useful standard of early postnatal growth for present-day very low birth weight, appropriate-for-gestational-age infants. The new weight curves are a more accurate reflection of current in-hospital growth trends, especially for infants weighing ≤1000 g at birth.

Postnatal growth rate and gonadal development in circadian tau mutant hamsters reared in constant dim red light

Reproduction ◽  
2000 ◽  
pp. 327-330 ◽  
Author(s):  
RJ Lucas ◽  
JA Stirland ◽  
YN Mohammad ◽  
AS Loudon
Keyword(s):  
Time Course ◽  
Red Light ◽  
Somatic Growth ◽  
Postnatal Growth ◽  
Gonadal Development ◽  
Testicular Development ◽  
Wild Type ◽  
Similar Time ◽  
Syrian Hamsters ◽  
Body Weights

The role of the circadian clock in the reproductive development of Syrian hamsters (Mesocricetus auratus was examined in wild type and circadian tau mutant hamsters reared from birth to 26 weeks of age under constant dim red light. Testis diameter and body weights were determined at weekly intervals in male hamsters from 4 weeks of age. In both genotypes, testicular development, subsequent regression and recrudescence exhibited a similar time course. The age at which animals displayed reproductive photosensitivity, as exhibited by testicular regression, was unrelated to circadian genotype (mean +/- SEM: 54 +/- 3 days for wild type and 59 +/- 5 days for tau mutants). In contrast, our studies revealed a significant impact of the mutation on somatic growth, such that tau mutants weighed 18% less than wild types at the end of the experiment. Our study reveals that the juvenile onset of reproductive photoperiodism in Syrian hamsters is not timed by the circadian system.

Identical twins and developmental stability

1962 ◽  
Vol 4 (1) ◽  
pp. 144-164 ◽  
Author(s):  
C. S. Taylor
Keyword(s):  
Growth Curves ◽  
Identical Twins ◽  
Body Measurements ◽  
Frequency Distributions ◽  
Stability Of Development ◽  
Mean Size ◽  
Degree Of Maturity ◽  
The Stability ◽  
Average Size ◽  
Slow Growing

1. The stability with which dairy cattle develop in body size up to 2 years of age was studied in 60 pairs of uniformly treated identical twins, i.e. an assessment was made of the influence of season, genotype, mean size of twin pair, age and degree of maturity on the level of within-pair variability.2. The frequency distributions of size differences shown by one-egg twins were in many cases decidedly leptokurtic.3. The similarity in size of the identical twins studied was only slightly, if at all, influenced by season. Within-pair variability under free outdoor grazing was certainly not any greater than under semi-controlled conditions indoors.4. The stability with which cattle grew appeared to depend on their genotype. Identical twins of the Shorthorn breed were somewhat more alike in size than were the twins of other breed-types; crossbreds were, on average, 50 % less stable than purebreds in average size () ; although crossbreds grew with somewhat greater stability ().5. Whatever their mean size, all pairs of identical twins of the same breed appeared to grow postnatally with more or less equal stability (). Small, slow growing pairs showed a greater disparity in average size ().6. Stability of development continually changed with age but not violently. Each body measurement appeared to have its own characteristic age trend. It is false to believe that variation automatically increases with increasing age. As they grew older, identical twins tended to become less alike in their later maturing body measurements whereas their early maturing body measurements tended to decline in variability. There was an overall trend with degree of maturity; variability steadily increased to a maximum and subsequently declined.7. It is suggested that environmentally induced instability of development may remain at a minimum level so long as growth curves are not seriously distorted from their exponential path to maturity.

Observations on the postnatal growth and development of captive Ethiopian hedgehogs, Paraechinus aethiopicus, in Qatar

Mammalia ◽  
2016 ◽  
Vol 80 (5) ◽  
Author(s):  
Mohammad A. Abu Baker ◽  
Ivan Mohedano ◽  
Nigel Reeve ◽  
Nobuyuki Yamaguchi
Keyword(s):  
Growth And Development ◽  
Postnatal Growth

AbstractThe postnatal growth and development of the Ethiopian hedgehog (

Pre- and postnatal growth and development in sickle cell anemia

1980 ◽  
Vol 96 (5) ◽  
pp. 857-860 ◽  
Author(s):  
Michael S. Kramer ◽  
Yolanda Rooks ◽  
LaRue A. Washington ◽  
Howard A. Pearson
Keyword(s):  
Sickle Cell ◽  
Sickle Cell Anemia ◽  
Growth And Development ◽  
Postnatal Growth
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