Black dolphin has the experience of being pregnant and prolific.

First, breeding at the right time. Because the black dolphin is a small herbivorous mammal, the sign of oestrus is not as obvious as that of other animals. If the method of observing the estrus of other animals is used to observe the black dolphin, it is easy to miss the mating period and bring losses to production. Therefore, it is necessary to observe the signs of estrus every day, especially when feeding early in the morning. Estrus can be judged from the following signs: standing still, looking around; red, swollen, moist genitals with thin mucus overflow; loss of appetite; restlessness, running back and forth or chattering.

Second, repeated breeding. Female dolphins can be mated with 2 Murray for 3 times in one estrus. As the duration of ovulation of female dolphins is 10-18 hours, so the interval between 6-15 hours, less than 6 hours may not be effective or ineffective. The first mating of the black dolphin is in the second or third estrus, and early breeding can control the excessive size of the female dolphin.

Third, master breeding techniques and measures. Before the first mating of female dolphins and 9-18 hours after giving birth, male dolphins are put into mating, which can shorten the reproductive cycle and have a high pregnancy rate. The average estrus period of the female dolphin is 16 days, so it is necessary to observe whether the female dolphin has signs of estrus 19 days after mating to determine whether the mating is successful, and if there are signs of oestrus, it indicates the failure of mating.