Feeding DanBred Gilts
The breeding gilt is a very valuable animal as it forms the basis for future production in the herd. Whether the gilt is bought in or home-reared, careful attention to the feeding of the DanBred gilt in the weight interval from 30 kg until mating will set a prime starting point on the road to releasing the genetic potential.
- 220-240 days of age in the insemination period
- 140-160 kg of weight in the insemination period
- 13-15 mm of backfat in the insemination period
- Gilts should be mated in their second heat
- Gilts should be fed restrictively from around 30 kg until flushing is initiated
Body condition & Weight
DanBred gilts come with a huge potential for daily gain, why is advised to focus on limiting the growth rate for the DanBred gilts as moderating the growth rate for replacement gilts has shown to be positively correlated with sow longevity, since reduced growth rate has a positive effect on especially bone growth, and a stronger body and stronger legs will reduce the risk of early culling in breeding animals.
Aiming for a gain of around 825 g/day from 30kg to 140kg has shown to give the best possible basis for long-term reproduction productivity.
Restricted feeding is recommended, as it is an easy way to regulate daily gain. Feeding gilts ad libitum can increase the risk of daily weight gain exceeding recommendations, especially when feeding diets with moderate or high protein content.
As the body fat content can play a role in the onset of puberty and oestrus, it is important to aim at a backfat target not less than 14 mm – the optimum is 14-15 mm.
* Backfat target at the time of mating, when measured at the point P2.
DanBred gilts have a huge potential for growth, which is why the feed energy level is a very important factor. To efficiently control daily gain, crude protein and lysine supply must be reduced.
Using restricted phase feeding with three different diets from 30 kg until service is highly recommended. If ad libitum feeding is the only possibility, the recommendation is to add an amount of quality fibre to the diet and reduce the amount of lysine and protein to control daily gain.
To promote greater backfat deposit, the diet should be changed when the gilts weigh around 110kg. This can be done by keeping the energy density but slightly reducing protein and lysine content in the feed ration. Moreover, it is recommended to feed the gilts based on body condition.
Moderating growth and increasing fat deposits through feeding will give a gilt that is not as heavy but is slightly fatter at the optimal age of first service.
The basic nutritional requirements for DanBred sows are described below. The requirements are based on production in a temperate zone, adaption for the relevant climate may be necessary.
|Energy, per kg feed||Gilts 30-110 kg||Gilts 30-65 kg||Gilts 65-110 kg||Gilts > 110 kg|
|MJ ME/kg feed||12.8||13.0||12.8||12.5|
|MJ NE/kg feed||9.7||9.8||9.7||9.4|
|Danish Feed Units (FU) sow/kg||1.05||1.07||1.05||1.02|
|Basic nutrients, digestible per kg|
|SID protein. min g/kg||105||125||100||95|
|Lysine. SID g/kg||6.3||8.2||5.3||4.2|
|Digestible phosphorus g/kg||2.6||3.2||2.4||2.1|
|Calcium, g/kg (at 0 FTU phytase)||7.7||8.5||7.4||7.1|
Mineral and vitamin supply should be adequate to ensure normal bone development and general health. Soluble, as well as insoluble fibres, should be added to maintain gut health.
The full nutrient tables for gilts can be found here.
DanBred gilts come with a huge potential for daily gain why it is advised to prioritise feeding 2 to 3 times per day over ad libitum feeding. Restricted phase feeding of the DanBred gilts following the recommended feeding curve is an ideal solution to ensure a balance of the feed amount in relation to age and weight.
The figure below describes the feeding of gilts until the first service. Keep the target of 14-15 mm backfat at mating in mind throughout the full development period.
Gilts that fall behind from around 90 kg, can be fed with app. 3,5 kg of the diet from gilts above 110 kg. “Flushing” of the gilts at this point, will favour the deposition of backfat, and make them ready for the first mating.
Using flushing, where the feed allowance 5-7 days before expected service is increased markedly, have shown to increase the number of released eggs, hence optimising litter size. Gilts that enter the service unit with less than 12 mm of backfat should be flushed 21-28 days with a diet low in protein/lysine.
The effect is explained by an increase in blood glucose which initiates higher insulin and IGF-1 production, initiating an increase of blood plasma oestradiol which stimulates the production of eggs. Moreover, the increased energy and protein stimulates the follicle stimulating hormone (FSH) responsible for early follicle maturation, and the level of luteinizing hormone (plasma LH), which contributes to the final follicle development and thus to increased ovulation rate.
Keeping the gilts on target with careful attention to their development will be rewarded in the farrowing unit and set a prime starting point on the road to releasing the genetic potential for consistently high lifetime productivity.