Differences in food resource allocation in a long-term selection experiment for litter size in mice 1. Developmental trends in body weight and food intake against time
| Autor: | Pieter W. Knap, P. Luiting, O. Vangen, Wendy M. Rauw, M. W. A. Verstegen |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
0301 basic medicine
Litter (animal) media_common.quotation_subject 0402 animal and dairy science 04 agricultural and veterinary sciences Growth curve (biology) Biology Body weight 040201 dairy & animal science 03 medical and health sciences 030104 developmental biology Animal science Control line Linear regression Sexual maturity Animal Science and Zoology Reproduction Selection (genetic algorithm) media_common |
| Zdroj: | Animal Science. 71:31-38 |
| ISSN: | 1748-748X 1357-7298 |
| DOI: | 10.1017/s1357729800054862 |
| Popis: | Differences in the metabolic resource situation between non-reproductive male and female mice of a line selected for high litter size at birth (average of 22 born per litter) and a non-selected control line (average of 10 born per litter) were investigated in two replicates. Brody curves were fitted to individual data on body weight against age and linear regression lines were fitted to individual data on cumulative food intake against age. Mature body weight and mature daily food intake were higher in selected mice than in control mice and higher in males than in females. Selected males matured faster than selected females and control mice. In general, differences in growth and food intake curves between species or lines can mostly be explained by differences in mature size. Therefore, parameters were subsequently scaled by individual estimates of mature body weight. Differences that remain after scaling are a consequence of what have been called specific genetic factors. Scaled mature food intake was higher in selected mice than in control mice and higher in females than in males. Scaled maturation rate was higher in selected mice than in control mice and higher in selected males than in selected females. This shows that in the present study, specific genetic factors have been detected for both body weight and food intake, which suggests that selection for increased litter size has disproportionally changed the resource allocation pattern. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|