Effect of glucagon on the metabolic rate in growing chicken

The investigations were carried out on 70 growing broiler chickens. The chickens were kept on a higher and the other ones on the lower level of nutrition. As a result of this the rate of growth was different in both groups. Glucagon had a strong calorigenic effect, reaching a peak 30 min after its injection. This effect of glucagon increased progressively with the growth and development of birds reaching a maximum in chickens aged about 7 weeks, and weighing approx. 1200 g. In the birds examined 2 hours after feeding the calorigenic effect of glucagon was most expressed in birds maintained on the low nutrition levels. The fall of RQ after glucagon injection may suggest that this hormone has a strong lipolytic action.