Objective To determine the susceptibility of Meriones unguiculatus to sodium diphacinone. Methods Baits containing high, medium, and low concentrations of sodium diphacinone were given to M. unguiculatus raised in the laboratory to test the acute toxicity of this rodenticide. Results The mortality rate was 100% in the M. unguiculatus receiving baits with different concentrations of sodium diphacinone. Although the lethal time was a little shorter in the M. unguiculatus treated with high-concentration bait, the total intake of sodium diphacinone was significantly lower in female and male M. unguiculatus treated with low-concentration bait (0.457 mg and 0.394 mg) than in those treated with medium-concentration bait (0.704 mg and 0.834 mg) and those treated with high-concentration bait (1.614 mg and 1.358 mg). Conclusion Use of the bait with low concentration of sodium diphacinone can reduce the cost of rodent control, and it can delay the development of rodenticide resistance, thus prolonging the service life of sodium diphacinone.

【Abstract】 Objective To study the anti?fertility effect of gossypol to Lasiopodomys brandtii. Methods The effect of gossypol to sperm quality, testis and epididymis tissues of L.brandtii was tested with one?off quantitative gastric gavages. Results Gossypol did harm to spermatids, spermatocytes and testis tissue lesions. Testis and epididymis tissues coefficient decreased obviously at the dosage of 20-100 mg/kg, and sperm concentration reduced and sperm malformation increased at 20 mg/kg. It leaded to the death of L.brandtii when the dosage exceeded 60 mg/kg. Conclusion The gossypol had significant anti?fertility effect on male L.brandtii at the concentration of 20-100 mg/kg, but it was lethal at high concentrtion.