Types of Pig Housing Systems in India

Pig housing in India is broadly classified into three systems based on the degree of confinement and management intensity. These are: (1) Intensive System, (2) Semi-Intensive System, and (3) Extensive System. Each system has its own advantages, disadvantages, and suitability depending on the farmer's resources and production goals (ICAR, 2013; Pattanaik and Nayak, 2015).

4.1 Intensive System

In the Intensive System, pigs are kept in fully enclosed or semi-enclosed pens (enclosures) throughout their lives. They do not have access to open pasture or outdoor areas. The farmer provides all feed, water, and management inputs inside the pen. This system is used by commercial pig farmers who want maximum production in minimum space.

The intensive system allows the farmer to control feeding, health monitoring, and breeding more accurately. It results in faster growth and better feed efficiency. However, it requires high investment in construction, feed, and veterinary care. It also requires more skilled labour (ICAR, 2016).

The intensive system is most suitable for improved exotic breeds and crossbred pigs such as Large White Yorkshire, Landrace, Hampshire, and their crosses with Desi (indigenous) pigs. These breeds grow faster and produce more meat when kept under controlled intensive conditions (Pattanaik and Nayak, 2015).

4.1.1 Pen (Stall) Design in Intensive System

In the intensive system, pigs of different ages and categories (weaners, growers, finishers, sows, boars) are kept in separate pens. Each pen is designed for the specific needs of that group. Pens are made of concrete walls, concrete floors with slope for drainage, and iron or steel railings/gates.

The floor must have proper slope (2–3 cm per metre) toward the drain to allow urine and washing water to flow out quickly. The drain should be covered with iron grilles to prevent pigs from getting injured. Smooth concrete floors are not recommended as they cause slipping — the floor should be roughened or have a slightly textured surface (ICAR, 2013).

Category of Pig

Floor Space per Animal (sq.m)

Pen Width (m)

Pen Length (m)

Piglets (up to 8 weeks)

0.5–0.6

1.5–2.0

2.0–2.5

Weaners (8–16 weeks)

0.6–0.8

2.0–2.5

2.5–3.0

Growers (16–24 weeks)

0.8–1.0

2.5–3.0

3.0–4.0

Finishers (24 weeks – market)

1.0–1.2

2.5–3.0

3.5–4.5

Dry / Pregnant Sow

1.5–2.0

2.0–2.5

3.0–3.5

Farrowing Sow with Litter

5.0–6.0

2.5–3.0

5.0–6.0

Boar (Adult)

6.0–7.0

2.5–3.0

5.0–6.0

Table 1: Recommended Floor Space for Pigs in Intensive System (Source: ICAR, 2013, 2016)

4.1.2 Farrowing Pen (Birthing Pen)

The farrowing pen is a special pen where the sow (mother pig) gives birth and nurses her piglets for the first 6–8 weeks. This is the most critical pen in the entire pig house. The pen must be clean, warm, and safe for both the sow and the newborn piglets.

A farrowing crate is often used inside the farrowing pen. This is a metal frame that restricts the sow's movement slightly, preventing her from accidentally crushing the piglets when she lies down. Piglet crushing is the single biggest cause of piglet death on pig farms (ICAR, 2016).

The farrowing pen should have a 'creep area' — a small warm corner with a heat lamp or bulb where piglets can rest away from the sow. The temperature in the creep area for newborn piglets should be 30–32°C in the first week, reducing gradually as piglets grow (ICAR, 2016).

Component

Recommended Specification

Farrowing Pen Size

2.5 m × 2.0 m (minimum)

Farrowing Crate Size

2.1 m × 0.6 m

Creep Area Size

1.0 m × 0.8 m per litter

Creep Temperature (Week 1)

30–32°C

Creep Temperature (Week 4)

24–26°C

Floor of Creep Area

Wooden boards or rubber mat

Heat Source

250-watt infrared bulb or heat lamp

Table 2: Farrowing Pen Specifications (Source: ICAR, 2016; Nair, 2010)

4.2 Semi-Intensive System

In the Semi-Intensive System, pigs are kept in covered pens but are also provided access to an open outdoor area called a 'run' or 'paddock' during part of the day. This system combines the comfort of indoor shelter with the benefits of outdoor exercise and natural behaviour.

This system is popular among medium-sized farmers and is well-suited for crossbred pigs. The outdoor area allows pigs to exercise, wallow (roll in mud or water to cool down), and root around — all natural behaviours that reduce stress and improve animal health. Pigs that can wallow and exercise show better reproductive performance and immune health (Singh and Prasad, 2014).

The run area should be fenced with strong concrete or brick walls at least 1.0–1.2 metres high, as pigs are strong animals and can break through weak fences. Rubble or brick rubble should not be left in the run area as pigs may swallow them while rooting.

According to ICAR (2013), a wallow (a small shallow pool or muddy area) should be provided in the outdoor run, especially during the hot summer months (April to June) in India. Alternatively, a sprinkler or overhead shower system in the outdoor area can help pigs cool down.

Category of Pig

Indoor Pen Space (sq.m)

Outdoor Run Space (sq.m)

Total Space (sq.m)

Weaners (8–16 weeks)

0.5–0.6

0.5–0.8

1.0–1.4

Growers (16–24 weeks)

0.7–0.8

1.0–1.5

1.7–2.3

Finishers (market pigs)

0.9–1.0

1.5–2.0

2.4–3.0

Dry/Gestating Sow

1.5

2.0–3.0

3.5–4.5

Boar

5.0–6.0

6.0–8.0

11.0–14.0

Table 3: Space Requirements for Semi-Intensive Pig Housing (Source: ICAR, 2013; Singh and Prasad, 2014)

4.3 Extensive System (Free Range / Village System)

In the Extensive System, pigs are allowed to roam freely in open areas during the day. They find a significant portion of their food by foraging — eating roots, fallen fruits, crop residues, kitchen waste, and insects from the ground. At night, they return to simple shelters built by the farmer.

This system is the most common pig farming method in rural and tribal areas of India, especially in states like Meghalaya, Nagaland, Mizoram, Manipur, Assam, Jharkhand, and Odisha, where indigenous pig breeds like the Ghurrah, Niang Megha, Doom, and Agonda Goan are commonly reared (ICAR, 2014).

The extensive system requires very little capital investment and is suitable for resource-poor farmers. However, pigs that roam freely can cause damage to crops and neighbouring properties. They are also at a high risk of contracting diseases and parasites from the environment, especially when they eat contaminated waste or faeces (ICAR, 2014).

Simple shelters (pigsties) used in the extensive system can be made from locally available materials like bamboo, thatch, mud walls, and stone. The shelter should be raised slightly above ground level to prevent flooding. Clean, dry bedding of dry leaves, straw, or rice husk should be provided for pigs to sleep on (ICAR, 2014).

Feature

Details / Recommendation

Type of Pigs

Indigenous breeds (Desi pigs)

Shelter Space per Pig

1.5–2.0 sq.m (minimum)

Roaming/Foraging Area

200–500 sq.m per pig (open land)

Shelter Material

Bamboo, mud, thatch, stone

Feeding

60–70% from foraging + 30–40% from farmer

Water Supply

Natural sources + clean trough

Disease Risk

High — regular deworming essential

Management Cost

Very Low

Breed Suitability

Indigenous / Desi pigs only

Table 4: Features of Extensive / Village Pig Housing System (Source: ICAR, 2014)

5. Comparison of All Three Pig Housing Systems

Feature

Intensive

Semi-Intensive

Extensive

Land Requirement

Low

Moderate

High

Construction Cost

High

Medium

Low

Feed Cost per Pig

High

Medium

Low

Growth Rate of Pigs

Fast

Medium

Slow

Disease Control

Easier

Moderate

Difficult

Labour Requirement

High

Medium

Low

Suitable Breeds

Exotic/Crossbred

Crossbred/Desi

Desi breeds

Suitable For

Commercial farms

Medium farms

Village/tribal farmers

Animal Welfare

Low

Medium

High

Profitability

High (if managed well)

Medium

Low to medium

Table 5: Comparison of Pig Housing Systems in India (Source: ICAR, 2013; Pattanaik and Nayak, 2015)