Solutions to rabbits not in estrus:

1. Supplement nutrition. Rabbits can be given appropriate vitamin supplements and pregnant horse serum can be injected to promote estrus.

2. Opposite sex induction method. Both male and female rabbits have a sex pheromone that can induce sexual impulses and courtship behavior in the opposite sex of the same species. Raise them in the same cage so that they can receive each other's sex pheromone.

3. The aphrodisiac method of patting the vagina. Before mating, lift the female rabbit's tail with your left hand and pat her vagina with your right hand. When the female rabbit naturally raises her buttocks, you can put the female rabbit into the male rabbit cage for mating.

The reasons why rabbits are not in estrus:

1. Vaginal deformity, fallopian tube stenosis, stillbirth in the uterus, etc. due to physiological or disease reasons can cause female rabbits to not be in estrus.

2. Rabbits that are too fat or too thin, or the temperature of the living environment is too high or too low, can also cause rabbits to not be in estrus.

3. Rabbits with uneven nutrition, single feed, and lack of vitamin A in the body can also cause rabbits to not be in estrus.