Objectives:

| Age and BW at the beginning and end of rearing period | Starts Day 90 → BW 30kg End Day 210 → BW 120kg | | --- | --- | | Factors influencing the onset of insemination | At day 90 a decision of either breeding or fattening is made for the piglet based on several factors:

1. BCS “3” → Measured by BACK FAT (16-20mm)

   ◦ P2 → Can be checked with ULTRASOUND 6cm off midline at 10th rib ◦ 16mm at first check and 20mm around farrowing | | | | | Daily rations | • Day 90 → pig is 30kg - Selection to breed

• Day 140 → pig is 80kg - 2nd preselection, + boar contact (estrus stim) ◦ Re-Check BCS → below or above 16-20mm? ▪ Gilt may require special feeding program to build up her fat cover → ………………… …………. if not risk of “thin sow syndrome” (fat deleption over subsequent preganncies) ▪ If too fat → ⬇️fertility

• Day 190 → 1st oestrus (3 weeks until next one)

• FLUSHING → 10-14 days prior to next estrus

• Day 210 → BW 120-130 kg

First mating time → Around 2nd esturs and approx 130kg (backfat → 18-20mm) | | | | | Flushing - 10-14 days prior to next estrus | • Nutritional strategy before breeding to improve ovulation rate ⬆️ & litter size • DE is changed (quality⬆️) and increased 14.2 MJ/kg and 0.72% lysine. ▪ adding sugar to water works too

• How can it help ovulation rate? ▪ ⬆️Feed intake = ⬆️ Energy = ⬆️GnRH = FSH,LH = OVULATION | | | | | Protein and energy contents of the feed | **Pregnant sow : CP 13.5% DE 13 MJ Lys 0.65%

Lactacing sow : CP 18-19% DE 14.2 MJ Lys 1.0%** | | | | | Feeding strategies for replacement gilts: | 1. Genetically lean maternal lines → to increase body fat during pre-breeding peroid (16-20mm) 2. Gilts with less lean potential → to prevent to high fat deposition (more than 23mm) during pre-breeding peroid |

At day 90 a decision of either breeding or fattening is made for the piglet based on several factors:

1. BCS “3” → Measured by BACK FAT (16-20mm)
   • P2 → Can be checked with ULTRASOUND 6cm off midline at 10th rib
   • 16mm at first check and 20mm around farrowing

REPLACEMENT GILTS

• If BCS was good enough at day 90 the pig is selected for breeding

Day 90 - 210 // 30kg - 120kg (same weight but more days)

• Day 90 → pig is 30kg - Selection to breed

• Day 140 → pig is 80kg - 2nd preselection, + boar contact (estrus stim)

  • Re-Check BCS → below or above 16-20mm?
    • After selection Gilt may require special feeding program to build up her fat cover → if not risk of “thin sow syndrome” (fat deleption over subsequent preganncies)
    • If too fat → ⬇️fertility

• Day 190 → 1st oestrus (3 weeks until next one)

• FLUSHING → 10-14 days prior to next estrus

  • Nutritional strategy before breeding to improve ovulation rate ⬆️ & litter size
  • DE is increased 14.2 MJ/kg and 0.72% lysine.
    • Changing energy source (higher quality) or adding sugar to water!
  • How can it help ovulation rate?
    • ⬆️Feed intake = ⬆️ Energy = ⬆️GnRH = FSH,LH = OVULATION

• Day 210 → BW 120-130 kg

First mating time :

• Around 2nd esturs and approx 130kg (backfat → 18-20mm)

Feeding strategies for replacement gilts:

1. Genetically lean maternal lines → to increase body fat during pre-breeding peroid (16-20mm)
2. Gilts with less lean potential → to prevent to high fat deposition ( more than 23mm) during pre-breeding peroid

Protein and energy contents of the feed

Recommneded nutrient levels for pregnant and lactating sow diets