EU PiG – Routine weighing for accurate feeding

Farmer Aage Lauritzen of Denmark has achieved a 5% increase in daily liveweight gain and reduced total production costs since investing in a weighing system to record growing and fattening pigs’ liveweight on a weekly basis. The information is used to monitor pigs’ growth, so he can compare it with the expected growth and then choose the appropriate feed mix.

Although a large variety of factors impact feed efficiency (e.g. breed, environment, health, body composition), the body weight of the animals is arguably the most important factor driving pigs’ nutritional requirements during the growing period. Therefore, any system that periodically records the liveweight of pigs will enable farmers to monitor growth performance and apply management strategies to improve it.

Costs and benefits

• Daily liveweight gains are 5% higher (466 g/day in rearing pigs and 998 g/day in finishing pigs)
• Feed conversion ratio is 0.1–0.15 (feed per kg) lower due to better utilisation of feed
• Aage says that one hour per week of extra labour for weighing the pigs is required, but less time is spent when weighing pigs out for slaughter

• It makes it possible to identify problems and intervene earlier
• Feeding regimes can be changed accordingly in finisher pigs
• Positive results can be celebrated, which is motivating for employees
• Better prices are received for finished pigs because they can finish them at the right time at the optimal weight
• An investment cost of 31 500 DKK (ca. €4200), to buy a scale where an entire pen of pigs can be weighed simultaneously

Considering the above, the variable production costs have decreased by 3.03% and fixed costs by 1.76% (additional fixed costs have had a smaller impact than the efficiency gains, resulting in reduced average fixed costs per kg).

In conclusion, the total costs are 2.72% lower.

Aage’s pigs are weighed on a weekly basis, and data is typed into a system to monitor weight gain. For finisher pigs, their weight is monitored at shorter intervals, and the feed mix is changed accordingly. However, the weighing system also allows Aage to monitor the average daily weight gain.

Routinely weighing the pigs allows Aage to select more effectively the largest pigs that are sent to slaughter, thus allowing an increase in space allocation for the remaining pigs and reducing competition at the feed station or feeder. Pig weighing on a regular basis can also provide early warning signs of upcoming diseases or more accurate veterinary interventions (dosing of medication is linked to the animal's body weight in almost all cases). This means disease has a lower impact on feed and growth efficiency.

Aage is also committed to feeding pigs a mixture of two feeds blended according to their weight. This more precise feeding practice has the potential to optimise performance by reducing lysine intake and nitrogen excretion by more than 20%.

To perform feeding trials, additional equipment was needed to register feed consumption automatically.

Aage can monitor average daily liveweight gain. Monitoring growth data enables feeding and management programmes to be adjusted and optimised.

To access more information, contact RPIG (Denmark): Claus Hansen or EUPig@ahdb.org.uk

Aage Lauritzen has invested in a systematic routine weighing system

Scales can weigh a pen of pigs simultaneously

This project has received funding from the European Union`s Horizon 2020 research and innovation programme under grant agreement No 727933.