Please enable JavaScript.

Coggle requires JavaScript to display documents.

Pig Nutrition :pig:, Replacement Gilts, Pregnant Sows, Growing Pigs,…

- - - - Gilt relatively higher req for maternal growth
    - - mainly in late gestation period
    - - For every 25kg gain in sow BW, daily E reqs incr by 2MJ DE
      - 75-85% of total E req
      - Req influenced by BW, daily maternal E req, activity (housing)
  - - - Uniformity of piglets
        
        Higher litter weights
      - Overall feed supply must relate to condition of sow (indiv feeding of sows necess)
      - Reduced feeding levels in early preg can be beneficial to ova implantation in 1st month if sows are fat
        
        Some evidence for reverse - higher levels in early preg incr subseq litter size in sows thart have suffered lactation weight loss
        
        Some work showed improved litter size from feeding higher levels after mating (3kg) & for first 3 weeks of preg
        
        Little/no evidence for this in modern genotypes
      - Effect of extra gestation feed during first 35 days of gestation
    - - Dev of 2ndary muscle fibres
      - Mid preg nutrition aim:
        
        Recover body reserves
        
        Allow for 30-35 kg net body gain for 1st & 2nd parity sows
        
        Plane of nutrition btwn 20-80d of preg can be NB to muscle fibre no of pigets @ birth
        
        Achieve moderate growth (not excessive gain)
        
        Mid-preg = prep period for mamm tissue dev
    - - Incr nutrient demand for:
        
        Fetuses
        
        Placenta
        
        Mamm gland
      - Late preg nutrition aim:
        
        Incr feed level to prevent loss of maternal body reserves
        
        Support foetal & mammary growth
        
        Incr piglet birth weight
  - - - Feed sows indiv
      - Non-standardised ration allowance calc according to each sows indiv needs
  - - - Most productive sows = thin
      - Just as undes as thin sows - unproductive
      - Unproductive sows never deplete reserves
      - Fatness = default of low productivity
      - No benefit in breeding pig w/ backfat in excss on 25-30mm P2
    - - Difficulties furrowing
        
        Dystocia
        
        Less vital piglets
        
        Prolonged farrowing process
        
        Higher mortality rate of piglets
      - Lactation intake likely to be affected when backfat depth @ parturition >25mm
        
        Lower milk prod
        
        Incr weight loss of piglets
      - Overfeeding can harm mamm gland dev
      - Fat sows more clumsy & likely to crush piglets
      - Overfeeding preg sow ~ fat
  - - - E likely short in supply for milk synthesis
      - Under well-managed sow feeding prog - avg sow BF remains btwn 15-20% (lowest @ weaning & highest @ parturition)
      - Sows shouldn't lose more than 2-3mm back fat during lactation (6mm - max)
    - - During early parities sow still growing (both lean & fat depos) to achieve target mature lean mass & gains should be in of 25kg
      - During later parities - preg gains almost entirely fatty tissues