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Effects of reducing dietary content of crude protein and indispensable amino acids on performance and carcass traits of single-phase- and 2-phase-fed growing-finishing pigs

Presto Åkerfeldt, Magdalena and Lindberg, Jan Erik and Göransson, Leif and Andersson, Kristina (2019). Effects of reducing dietary content of crude protein and indispensable amino acids on performance and carcass traits of single-phase- and 2-phase-fed growing-finishing pigs. Livestock Science. 224 , 96-101
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Abstract

Effects of reducing dietary content of crude protein (CP) and Lys on performance and carcass traits of growing-finishing pigs were studied in 690 crossbred (Swedish Yorkshire dams x Hampshire sires) female and vaccinated entire male pigs with an average initial live weight (LW) of 32.3 kg. The pigs were raised in pens with mixed sexes and were fed restrictedly using 2 different feeding plans, single-phase and 2-phase. Within each feeding plan, 3 CP contents were investigated: 13.5 (low), 14.5 (medium), and 15.5 (high) g standardized ileal digestible(SID) CP/g SID Lys. Each CP comprised 2 Lys contents. For single-phase-fed pigs this implied either 0.76 or0.85 g SID Lys/MJ net energy (NE). For 2-phase-fed pigs, the contents were either 0.89 in phase 1 and 0.71 in phase 2 or 0.98 in phase 1 and 0.79 in phase 2 g SID Lys/MJ NE. In low and high Lys, the expected total consumption of digestible Lys from start to slaughter was calculated to be equal for single-phase- and 2-phase-fedpigs. The change of diet in the 2-phase feeding plan was at an average LW of 60.8 kg and slaughter was performed at 117.3 kg. Irrespective of dietary CP and Lys content, 2-phase-fed pigs had higher daily weight gain(DWG) and better feed conversion in phase 1 than single-phase-fed pigs. In phase 2, single-phase-fed pigs fully compensated, so that overall DWG and feed conversion did not differ between single-phase- and 2-phase-fed pigs(1014 vs. 1013 g/d; 24.5 vs. 24.5 MJ NE/kg DWG). Dietary CP content had no effect on DWG and feed conversion in phase 1. However, pigs grew faster and had better feed conversion in phase 2 (P= 0.002 and P= 0.018, respectively) and during the entire raising period with the high CP content (P= 0.003 and P= 0.006, respectively). For both single-phase- and 2-phase-fed pigs, high dietary Lys content improved DWG and feed conversion in phase 1 compared with the low content (1002 vs. 968 g/d;P= 0.001 and 20.7 vs.21.5 MJ NE/kg DWG;P= 0.004), whereas no difference was observed in phase 2. Overall, Lys content did not affect DWG, while feed conversion was better for pigs fed the high Lys content (P= 0.035). Carcass traits were unaffected by feeding plan, CP, and Lys content. Reducing dietary CP content from high to low diminished the N output by approximately 20%. The conclusions are that growing-finishing pigs had the capacity for compensatory growth and can therefore be single-phase-fed, and that the current recommendations of CP and Lys could be reduced.

Authors/Creators:Presto Åkerfeldt, Magdalena and Lindberg, Jan Erik and Göransson, Leif and Andersson, Kristina
Title:Effects of reducing dietary content of crude protein and indispensable amino acids on performance and carcass traits of single-phase- and 2-phase-fed growing-finishing pigs
Year of publishing :2019
Volume:224
Page range:96-101
Number of Pages:6
Publisher:Elsevier
ISSN:1871-1413
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial-No Derivative Works 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 402 Animal and Dairy Science > Animal and Dairy Science.
Keywords:Lysine, Protein, Compensatory growth, Single-phase feeding, 2-phase feeding, Nitrogen emission
URN:NBN:urn:nbn:se:slu:epsilon-p-99958
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-99958
Additional ID:
Type of IDID
DOI10.1016/j.livsci.2019.04.014
ID Code:16134
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(VH) > Dept. of Animal Nutrition and Management
Deposited By: SLUpub Connector
Deposited On:03 Jun 2019 12:32
Metadata Last Modified:03 Jun 2019 12:32

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