Published in Growth
Frequently, experiments are conducted in order to investigate the effects of various treatments on an animal's growth rate. The data from these investigations usually consist of each animal's body weight or accumulative weight gain at specific times during the experiment. The most common statistical techniques for analysis of growth rates (incremen...
Published in Growth
The effects of daily evening melatonin injections on serum and pituitary levels of growth hormone (GH) and follicle stimulating hormone (FSH) were investigated in male Syrian hamsters receiving thiourea in the drinking water. Melatonin injections, by themselves, had no significant effect on serum or pituitary GH. Thiourea induced hypothyroidism red...
Published in Growth
It was hypothesized that manipulation of litter size, thus nutrition, which has been shown to alter the neonatal response to cardiovascular stress (i.e. carbon monoxide) might also alter persistent post-stress changes. Rat pups reared in litters of 4 and 16 inhaled 500 ppm CO for 32 days ("CO"), or served as controls ("AIR"). Some pups were killed ...
Published in Growth
Simple least square regression analysis, major axis regression, and reduced major axis regression have been advocated for straight line fitting to the logarithmically transformed data pairs in bivariate allometric studies. As all these techniques are based on rigid a priori assumptions on the error structure, their application may lead to considera...
Published in Growth
The growth of individual's stature of the Hiroshima Growth Study was characterized from early childhood to adulthood. The samples used here were 2,567 males and 971 females. A Gompertz type growth model was used for characterizing both an individual and an average growth of stature. The expected amount of information per observation was evaluated w...
Published in Growth
The long term ingestion of a sugar-rich diet (low fat) caused severe obesity in adult rats. In a separate experiment, the habitual consumption of a fat-rich diet (40% kcal from fat) also caused severe obesity. Severe obesity developed in both groups of animals even though they did not overeat. Voluntary food intake for the sugar-fed rats averaged 2...
Published in Growth
Mathematical models of size and shape have played a prominent role in the first half century of Growth. In honor of the fiftieth anniversary of the journal, this paper reviews the development of these models. An historical perspective is taken with a focus on the changing context in which mathematical models have been studied. Early models were tho...
Published in Growth
Between 1983-1985 somatic data were collected on 631 Black boys age nine years drawn from Ibo, Yoruba, and United States black ethnic groups living in urban and rural locations. On urban-rural subgroups, measures of body weight and skin-fat thickness were analyzed for central tendency and variability. On each of the ethnic-regional subgroups studie...
Published in Growth
Three general growth models (Logistics, Gompertz and Saturation Kinetics) were compared for describing growth of broilers. Accuracy of fit, case of use and interpretation of data were used to compare the models. Data from a broiler feed restriction study was used to illustrate the parameter differences between the models. All three models accuratel...
Published in Growth
Both a decrease in the dietary carbohydrate level and an increase in the protein level decrease lipogenesis in chicks. Interpreting results of previous experiments can be confounded by alterations in the quantity of carbohydrate because as protein was added to the diets used in these studies, carbohydrate was decreased. In the present study, diets ...
