Reproduction

There are several ways to increase the number of pigs on your account:

• Buying animals at the Pig Fair.
• Purchasing piglets from the state farm nursery if animals are available there.
• Your own breeding through mating sows with boars (own or rented).

Buying animals is easy, while breeding allows you to improve the characteristics of the offspring and get more products.

Preparing for mating

To mate, you need a suitable pair: a sow and a boar, ready for the process.

Requirements for the animals

• Age: from 31 to 350 days inclusive.
• Weight: not less than 70 kg.
• Readiness for mating: not less than 100% (displayed by a heart icon).

Young (up to 30 days) and old (over 350 days) animals cannot mate. A sow over 350 days old finishes gestation. Gestation period: at least 35 days.

To breed your own animals, you need a pigsty of any standard. Renting a boar at a pig fair does not require a pigsty.

Periods of pregnancy and rest

• A sow’s gestation period lasts 35 days with optimal feeding. A poor diet prolongs the period.
• After giving birth, the sow rests for 10 days before the next mating.
• The breeding boar also rests for 10 days after mating.

If the diet is not optimal, these periods increase.

Number and weight of offspring

• A sow usually gives birth to 5–7 piglets.
• The sex of the piglets is determined randomly, the probability of giving birth to a boar is 5 times higher.
• The weight of a newborn affects the future weight of an adult animal and productivity.

Calculation of the total weight of the offspring

M = ((m₁ + m₂) / 2) × c

The weight of each piglet is adjusted by the inbreeding coefficient. Piglets weighing less than 0.6 kg are considered stillborn.

Example

Boar 110 kg, sow 90 kg: ((110+90)/2)x0.06 = 6 kg total weight of offspring.

Distribution of newborns

• Piglets belong to the clone that the sow gave birth to, if there is space available.
• If the limit is exceeded, newborns are transferred to another clone in the priority order: trainers → clone having most pigs → clone with a higher status → random selection.
• If there is no possibility of distribution: boars go to the state farm nursery for coupons, sows go to the state.

Newborns’ first meals occur immediately after birth. If a pigsty is available, piglets are fed from the pigsty’s feeder.

Pig selection

• Selection allows us to improve the characteristics of offspring.
• The inbreeding coefficient is important: close inbreeding reduces the performance of the offspring.
• The athletic skills of breeding boars can be inherited.

Calculation of offspring characteristics

X = 0.05 − i − (1 − KI) / N

Inbreeding coefficients