energia, mille aluseks on molekulide korrapäratu soojusliikumine ehk ühelt kehalt teisele energia andmine, selle (konkreetselt piiritlemata) hulk

one of several preliminary contests held to eliminate less competent contenders

the heat period, which usually lasts two or three days, is the time during which the sow will accept the boar. It is better to breed the sow during the second or third day of the heat period than during the first day., emaslooma (perioodiline) sugukihu