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Pig Journal Volume: 57
Publication date: May 2006

Refereed Section

LYSINE CONCENTRATION IN THE DIET: WEIGHT LOSS IN SOWS, LITTER WEANING WEIGHT, PRE-WEANING MORTALITY AND RETURN TO OESTRUS
P.K.N. Almond and G. Bilkei

Abstract
The effect of high dietary lysine levels on the performance in a breeding unit was studied in an Eastern-European large pig production unit. White European hybrid swine genetic lines were used and 2 parallel groups of parity 2-5 sows were selected for the trial and treated as follows:
Group 1 (n=64): received on day one after parturition a lactation diet with 0.92 % lysine.
Group 2 (n=74): received during the same period a lactation diet containing 1.5% lysine.
The following parameters were evaluated:
  1. lactation weight loss of the sow (kg).
  2. pre-weaning mortality of piglets/litter(%).
  3. weaning litter weight (kg).
  4. number (%) of regular returns to oestrus after first post-weaning mating.
Parameter A showed a significant (p<0.05) difference between the groups (group one: 6.79 +/-1.33 kg vs group two 2.61 +/-0.46 kg). Parameter B showed a non-significant difference between the groups (group one 11.22 +/- 1.55% vs group two 11.19 +/- 2.01%). The weaning litter weights revealed a significant (p<0.05) difference between the groups (group one 40.01 +/-1.34 kg vs group two 44.21 +/- 1.1 kg). Regular return to oestrus after first post-weaning mating was in group one, 20.3 %, in group two, 7.8 % (p<0.05). The average food consumption per sow during the whole period of lactation was 72.1kg in group one and 81.9 kg in group two. It is the opinion of the authors that high lactational dietary lysine levels improve the reproductive performance in breeding units.

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