If the information on this page can help prevent the loss of a sheep to bloat, it will have been worth my time to put this information here. In the simplest of explanations, bloat is an excess of gases in the rumen of sheep.
Atrial natriuretic peptide (ANP) is a hormone, produced mainly by cardiomyocytes, with a major role in cardiovascular homeostatic mechanisms such as natriuresis and vasodilation, which serve to regulate blood pressure.
A peptide hormone secreted by cardiac atrial cells in response to atrial distension (increased blood flow); causes increased renal sodium excretion and as such lowers blood pressure (antagonizing aldosterone).