条件筛选
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What should be noted when purchasing breeding pigs from outside?
Points to note when purchasing breeding pigs from outside
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How to test the quality of eel fry when purchasing them
(1) Water test method: Put the purchased eel fry into a container, add an appropriate amount of open-air water, and let it stand for 3-5 minutes. Eel fry of poor quality mostly float to the surface. (2) Shock test method: Remove the eel fry floating on the surface after the water test, let it stand again for 3-5 minutes, then strike the container once with your hand or foot. Eel fry of good quality react strongly, with their heads down and tails up, or try desperately to escape; eel fry of poor quality react sluggishly, with their heads up, tails down, curling, twitching, or turning belly up, etc. (3) Squeeze method: 1. Use your thumb and