Insulin and glucagon secretory patterns during propionate and arginine tolerance tests in Japanese black cattle with growth retardation
2007
Takasu, M.(Gifu Univ. (Japan)) | Kishima, Y. | Nishii, N. | Ohba, Y. | Maeda, S. | Miyazawa, K. | Murase, T. | Kitagawa, H.
To evaluate the energy condition of cattle with growth retardation, propionate (PTT) and arginine tolerance tests (ATT) were carried out. The insulin/glucagon concentration ratio immediately before PTT or ATT in the cattle with growth retardation was lower than in the control. In the growth-retarded cattle, insulin-AUCsub(0-120min) during PTT was lower than in the control, while glucagon- AUCsub(0-120min) was the same as in the control. Insulin-AUCsub(0-120min) during ATT in the cattle with growth retardation tended to be lower than in the control, whereas glucagon-AUCsub(0-120min) was the same. Therefore, insulin-AUCsub(0-120min)/glucagon-AUCsub(0-120min) in the cattle with growth retardation was lower than in the control during both tolerance tests. The growth-retarded cattle showed lower insulin/glucagon ratio similar to that found in starved and lactating cattle, a suggesting lack of energy.
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