| Popis: |
SCIENTIFIC reports reveal many instances where several research workers conduct similar nutrition experiments which yield different results. For instance Vondell and Ringrose (1958) suggest that the optimum Calorie-protein ratio for chick growth lies between 45 and 53, whereas the work of Maraz et al. (1958) suggests that growth was best when this ratio was 45 or less. This discrepancy may be due to the fact that these two experiments were conducted on genetically different populations. The question then arises, are there likely to be significant gene-environment interactions with reference to energy and protein requirements and probably other factors? If such interactions prevail, it may require revision in certain experimental procedures as well as in recommendations for nutrient requirements. Extensive research has been reported on the energy and protein requirements of growing chickens. However, reference in this report is made mainly to research which was set up to reveal possible genetic … |
