Effect of dietary enrichment with canola oil on glucose tolerance, tissue glycogen content and viscera in Coturnix cortunix japonica
Lembede, B.W. (University of Witwatersrand, Johannesburg (South Africa). School of Physiology) | Magubane, M.M. (University of Witwatersrand, Johannesburg (South Africa). School of Physiology) | Donaldson, J. (University of Witwatersrand, Johannesburg (South Africa). School of Physiology) | Erlwanger, K.H. | Chivandi, E.
This study determined the effects of enriching a standard diet with canola oil on growth, glucose tolerance (GT), mass of viscera and tissue glycogen content in Japanese quail. Five-week old quail were randomly allocated to the control (STD; n=20) and test (HFD; n = 18) diet. After 5 weeks half the number of birds on each diet was subjected to an oral glucose tolerance test and the other half to an intravenous glucose tolerance test after which the birds were maintained on their respective diets for a week before the tests were repeated. After re-feeding for another week the fasting and fed-state blood glucose concentration (BGC) was then determined. Following euthanasia, viscera masses and tissue glycogen content were determined. There were no differences in the growth performance of quail on the two diets. Post-gavage, the BGC of male quail on the STD returned to basal concentration 90 min earlier compared to their counterparts on the HFD. The BGC of the female quail on the HFD at 30 min post-infusion was higher (P = 0.0476) compared to that of their counterparts on the STD. Pooled results showed similarity in oral and intravenous glucose tolerance between quail on the control and test diet. Despite similarities in the abdominal fat pad (AFPM), liver masses and liver, thigh and breast glycogen content between the groups, female quail had heavier (P = 0.0001) liver masses compared to their male counterparts. Male quail on either diet had heavier (P = 0.001) AFPM compared to females. While the HFD had gender related effects on GT, pooled results showed that supplementing the diet with canola oil did not elicit glucose intolerance, neither did affect growth and tissue glycogen content.
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