Determining the number of pens and stalls required in a pig unit

One objective in planning a pig unit is to balance the accommodation between the various ages and number of pigs. Ideally, each pen should be fully occupied at all times, allowing only for a cleaning and sanitation period of about 7 days between successive groups.

In the following example the number of different pens required in a 14-sow herd, where 8 week weaning is practised, will be determined.

Determine the farrowing interval and number of farrowings per year.

  • Average weaning to conception interval                    20 days
  • Gestation                                                            114 days
  • Suckling period (7x8 weeks)                                 56 days
  • Farrowing interval                                                 190 days

 

Number of farrowing per sow per year

 

Determine the number of farrowing pens

The piglets remain in the farrowing pen until 12 weeks of age.

  • Before farrowing                                    7 days
  • Suckling period                                     56 days
  • Rearing weaners                                   28 days
  • Cleaning and sanitation of pen               7 days
  • Occupation per cycle                             98 days

 

Thus one farrowing pen can be used for       farrowing per pen.

 

A 14 sow herd with an average of 1.9 farrowings per sow and year requires farrowing pens.

Determine the number of servicing / gestation pens.

  • Average weaning to conception interval                    20 days
  • Gestation period less 7 days in farrowing pen            107 days
  • Cleaning and sanitation of pen                                7 days
  • Occupancy per cycle                                            134 days

Thus one place in the servicing / gestation accommodation can be used for:

365/134 = 2.7 farrowings per year

With a total of 27 farrowing a year

27/2.7 = 10 places would be required.

Determining the number of places for replacement stock

Presume the sows on average get 5 litters, then 20 percent of all litters will be from gilts.

  • Rearing of breeding stock (12 to 35 weeks)     168 days
  • Gestation less 7 days in farrowing pen             107 days
  • Cleaning and sanitation of pen                       7 days
  • Occupancy per cycle                                    282 days

About 30% more animals are separated than the required number of gilts thus the required number of places in the 14 sow herd will be

 

Determining the number of places in the growing / finishing accommodation:

One stage finishing

  • Fattening of pigs 12 to 27 weeks of age (25 – 90kg)                    105 days
  • Extra period for last pig in the pen to reach marketable weight         21 days
  • Cleaning and sanitation of pen                                                   7 days
  • Occupancy per cycle                                                                 133 days

Assuming that 8 pigs per litter will survive to 12 weeks of age the number of places required in the finishing accommodation will be:

That is 8 pens with 10 pigs in each or 10 pens if each litter should be kept together.

Two stage growing / finishing unit:

Growing pigs 12 to 20 weeks of age will occupy a growing pen for 63 days including 7 days for cleaning.

places are required in the unit.

 

Finishing pigs 20 to 27 weeks of age will occupy a finishing pen for 70 days including 14 days emptying period and 7 days cleaning ( the emptying period will be shorter if the pigs are sorted for size while being transferred from the growing to the finishing pens)

 

places are required in the unit.

 

From the above example it will be appreciated that the number of pens of various kinds required in a pig unit is based on a number of factors. It is, therefore not possible to lay down hard and fast rules about the relative number of pens in herds with average or good management and performance in tropical conditions is given.


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OMEDO T. OLUPOT
+1 # OMEDO T. OLUPOT 2014-07-05 17:57
I liked the detailed structure of the rabbit structure and the dairy unit. Am disappointed that the piggery has been descriptive without the details of the diagrams and measurements.I would be grareful if these could be included.
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admin
+2 # admin 2014-07-07 09:55
We shall be posting on a detailed housing structures of piggery unit.
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Abelardo M. Catbagan Jr.
0 # Abelardo M. Catbagan Jr. 2017-04-29 12:36
Determine the number of pens required by a 100 sow swine farm:
- Dry sow pen
-Gestating stall
-Farrowing pen
Assumption: 1. age of weaning 30 days
2. Both sow and piglets are removed from the farrowing pen at weaning
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