A Detailed Guide to Snake Breeding Habits and Artificial Incubation Methods

1. Snake breeding habits

Snakes are dioecious animals with internal fertilization, reproducing by laying eggs or by ovoviviparity. Their sexual organs mature 2 to 3 years after hatching. Male and female snakes are not obviously different in appearance; the easier way to distinguish them is that among snakes of the same species and similar size, the female generally has a smaller head and a shorter, plumper tail, while the male has a larger head and a thinner, longer tail. When the rear end of the cloacal opening is firmly pinched with two fingers, the female's cloacal opening appears flat and concave, while two "hemipenes," that is, a pair of copulatory organs, protrude from the male's cloacal opening. This is a simple and easy method for accurately identifying male and female snakes.

Snakes come into heat and mate in spring or autumn. During the snake breeding season, a gland at the base of the female's tail emits a special odor, and the male tracks the female by this odor. The male has a pair of copulatory organs, the so-called "hemipenes," which are normally retracted into the base of the tail and can protrude from the cloacal opening during mating; only one side of the "hemipenes" is used each time. During mating, the two snakes tightly entwine like a twisted cruller, with their heads in the same direction; the male's body shakes violently, while the female lies still on the ground, and after ejaculation the male and female separate. In the breeding season, one male can mate with several females. In each year's breeding season, although the female accepts mating only once, sperm stored in the female's cloaca can still retain fertilizing capacity for 3 years. Therefore, in captive breeding, a male-to-female ratio of 1:8 is sufficient.

Snakes reproduce either by laying eggs or by ovoviviparity. Snake eggs are long and oval, with hard shells, and are milky white or pale yellow. The eggs are mostly laid in well-concealed grassland, fallen leaves, or compost piles with a certain temperature and humidity. Except for the king cobra and the sharp-nosed pit viper, which show egg-guarding behavior, most other snakes leave the laying site after laying eggs and let the eggs hatch under natural conditions. In ovoviviparous snakes, the eggs develop within their respective oviducts, and then the young snakes are born.

2. Artificial incubation of snake eggs

Because the incubation of snake eggs is greatly affected by environmental conditions, artificial incubation can be used to increase the hatching rate. According to the egg-laying period of different snake species, check promptly whether they are carrying eggs. When checking, first pinch the snake's neck with one hand, moving gently, and with the other hand gently massage and slide from the snake's belly to the cloacal opening. If a depression is felt on the belly, the closer it is to the cloacal opening, the more it indicates that egg-laying is imminent. The female about to lay eggs must be put into a snake box or egg-laying room as soon as possible to lay eggs. The female about to lay eggs must be put into a snake box or egg-laying room as soon as possible to lay eggs.

The laid snake eggs must be promptly placed in an incubator for incubation. The incubator can be a wooden box or a water vat. Taking the silver ring snake as an example, first place a large water vat in a cool, dry incubation room, put half a vat (at least 30 cm thick) of half-dry, half-moist loose soil or fine sand in the vat, then place the snake eggs flat on top of the loose soil or fine sand. Cover the vat with a perforated bamboo sieve or wire mesh to prevent mice from eating the eggs or the young snakes from escaping after hatching. Soak an appropriate amount of fresh, dry rice straw (wheat straw or sheep grass) in water for 1 hour, wring it dry after it is thoroughly wet, and place it on the eggs; after 3 to 5 days, wet the straw thoroughly and wring it dry again and place it on the eggs. Adjust humidity in this way. Turn the eggs once every 10 days. Throughout the incubation period, keep the room temperature at 20 to 25 degrees C, and the relative humidity at 50% to 90%. After 25 to 30 days of incubation, the embryonic development can be seen from outside the eggshell. If the reticular blood vessels in the embryo gradually thicken and gradually spread, it indicates that the embryo is developing well and a young snake can hatch; if the embryo has no blood vessels or the blood vessels are spot-like and do not spread, it indicates that the embryo has died and no young snake can hatch, and it must be removed promptly. Generally, the incubation period is mostly 40 to 50 days. When hatching, the young snake uses its egg tooth to cut through the eggshell, making 2 to 4 one-centimeter-long openings, with the head emerging first, and the body slowly crawling out, taking about 20 to 23 hours to completely emerge from the shell. The newly hatched young snake looks the same as an adult snake and moves lightly and agilely. However, it often cannot actively feed or drink, so bait must be fed with artificial assistance; see the section on rearing young snakes for details.

The key to the success or failure of artificial incubation lies in the following three points:

(1) Collect eggs promptly and incubate as early as possible. If eggs are stored too long or exposed to sunlight, the hatching rate will be reduced.

(2) Eggs must be placed flat, not upright. During incubation, turn the eggs once every 10 days, and in conjunction with turning, check the embryonic development and promptly remove dead-embryo eggs.

(3) Adjust temperature and humidity promptly. If the temperature is below 20 degrees C and the relative humidity is above 90%, the incubation period will be prolonged and the hatching rate will decrease; if the temperature is above 30 degrees C and the relative humidity is below 40%, the eggs lose water quickly, the eggs become sunken, and the hatching rate is also very low. Therefore, the core condition of incubation is to properly control temperature and humidity. When temperature and humidity are abnormal, adjustment measures should be taken immediately. For example, when humidity is too high, promptly open the box lid or vat lid to let some moisture dissipate; or place a hot water bag with 60 degrees C warm water 30 to 40 cm from the egg surface to accelerate water evaporation; or appropriately increase ventilation to reduce humidity.