The relationship between the production cycle and the number of litters per year of the sow The production cycle refers to the time interval during which a certain production step (such as mating, pregnancy, etc.) occurs repeatedly in pig production. Each production cycle consists of a period of rest, pregnancy, and breast-feeding. It consists of three phases. The period between mating and childbirth is called gestation period, and the time is fixed at 108-123 days with an average of 114 days.
The time between delivery and weaning is lactation. This period varies according to the level of production techniques and feeding and management conditions. The lower limit of lactation in production should be selected after the sow's lactation peak (20-30 days), up to a maximum of 60 days. The time from weaning to estrus breeding is called empty period, and the time is fixed. Generally, the sow is weaned and can be bred after 3 to 7 days.
Science pig raising
For example, the period of breastfeeding is 56 days, and the period of rest is 7 days. Then one production cycle is: 115+56 7=178 days, that is, sows need 178 days to produce a litter of piglets. There are 365 days a year, then the number of litters per year is 365 months and 78 = 2.05 (women).
If you want to reach an annual output of 2.3 nests, you should first calculate the number of days allowed in a production cycle: 365 orders 2.3 = 159 days, and then subtract gestation days Q days from the 159 days, empty period 7 days, leaving 37 days , that is, we can reach an index of 2.3 liters per year at 37 days of weaning.
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