Scientia Agricultura Sinica ›› 2011, Vol. 44 ›› Issue (18): 3840-3849.doi: 10.3864/j.issn.0578-1752.2011.18.015

• ANIMAL SCIENCE·RESOURCE INSECT • Previous Articles     Next Articles

Estimation of Lysine Requirement for Growing-Finishing Pigs Using a Precision Feeding Technique

ZHANG  Guo-Hua, PomarC , YANG  Gong-She   

  1. 1. 西北农林科技大学动物科技学院
    2. 加拿大农业部奶牛与猪研发中心
  • Received:2010-10-19 Revised:2011-03-30 Online:2011-09-15 Published:2011-09-15

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Abstract: 【Objective】 An experiment was conducted to investigate the effects of dietary lysine concentration on performance and body composition by precision feeding technique in growing-finishing pigs. 【Method】 Daily lysine requirements were calculated assuming that maintenance requirements are of 0.036×BW0.75, that 16% of the body weight gain is protein, that 7 % of the body protein is lysine, and that the efficiency for lysine retention from dietary apparently digestible lysine is of 72%. The 6 lysine levels were generated by feeding pigs with 60%-110% of the calculated requirements of the control pigs. Performance trials with 60 growing pigs at (28 ± 2.2) kg and 60 finishing pigs at (68 ± 5.8) kg were conducted in a duration of 28 d, respectively. Six dietary treatments were assigned randomly to 60 pigs. Four premixes were mixed in the adequate proportions to obtain the appropriate concentration of lysine all over the experiment by the automatic and intelligent precision feeder. 【Result】 Average daily gain, protein deposition and feed conversion increased linearly with the increasing lysine provided in relation to requirement (from 60 to 110%) in both periods, and a plateau appeared after the 100% lysine requirement for growing pigs. The residues lysine intakes were closed to 0 when the provided lysine reached 110% of the requirement. Compared to the traditional three-phase feeding system, feeding pigs from 25-55 kg with daily tailored diets reduced N and P intake both by 13%, and the corresponding excretions were reduced both by over 35%. Feeding pigs from 68-100 kg with daily tailored diets reduced N and P intake both by 10%, and the corresponding excretions were reduced both by nearly 20%. 【Conclusion】 The method proposed in this study is appropriated in estimating the daily lysine requirement for individual pigs at the liveweight of 25 to 55 kg, but maybe underestimated the daily lysine requirement at the liveweight of 68 to 100 kg. It was improved that the precision feeding is an essential method to reduce the nutrient and phosphorus intake and excretion.

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