The invention discloses an anti-freezing agent and an anti-freezing
diluent for freezing and storing
livestock sperm and a preparation method thereof. The anti-freezing agent for freezing and storing bovine and porcine
sperm is algin, the amount of the algin added into the conventional
diluent is 60 to 110 milligrams, wherein the conventional
diluent is prepared from 1.1 grams of glucose, 1.48 grams of
citric acid, 2.42 grams of
Tris, 10 percent of fresh egg
yolk, 0.06
gram of
penicillin sodium and 0.1
gram of
streptomycin sulfate, which are dissolved in 100 millimeters of
distilled water. The adding amount of the algin for cattle is 100 to 110 milligrams, and the adding amount of the algin for pigs is 60 to 80 milligrams. The preparation method comprises the following steps of: adding 100 to 110 milligrams of algin and 4 percent glycerin (for cattle) or 60 to 80 milligrams of algin and 1 percent glycerin (for pigs) into the conventional diluent to prepare the anti-freezing diluent; and adjusting the pH value of the solution to be between 6.5 and 7.5, filtering and sterilizing the anti-freezing diluent under the
osmotic pressure of 286mOsm / L, and putting the anti-freezing diluent into a 4 DEG C refrigerator for later use. The algin is used for freezing and storage of the bovine and porcine
sperm for the first time, and after unfreezing, the
sperm motility rate, the
acrosome completeness rate and the
plasma membrane completeness rate are 65 percent, 69 percent and 72 percent (for cattle) respectively and 58 percent, 62 percent and 63 percent (for pigs) respectively.