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Effects of reducing the standardized ileal digestible lysine and tryptophan to lysine ratio to slow growth of finishing pigs.
Tolosa, Andres F; Tokach, Mike D; Goodband, Robert D; Woodworth, Jason C; DeRouchey, Joel M; Gebhardt, Jordan T; Wolfe, Matt L.
  • Tolosa AF; Department of Animal Sciences and Industry, College of Agriculture, Kansas State University, Manhattan, KS 66506-0201, USA.
  • Tokach MD; Department of Animal Sciences and Industry, College of Agriculture, Kansas State University, Manhattan, KS 66506-0201, USA.
  • Goodband RD; Department of Animal Sciences and Industry, College of Agriculture, Kansas State University, Manhattan, KS 66506-0201, USA.
  • Woodworth JC; Department of Animal Sciences and Industry, College of Agriculture, Kansas State University, Manhattan, KS 66506-0201, USA.
  • DeRouchey JM; Department of Animal Sciences and Industry, College of Agriculture, Kansas State University, Manhattan, KS 66506-0201, USA.
  • Gebhardt JT; Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS 66506-0201, USA.
  • Wolfe ML; Provimi North America, Brookville, OH 45309-8884, USA.
Transl Anim Sci ; 6(2): txac057, 2022 Apr.
Article in English | MEDLINE | ID: covidwho-1931906
ABSTRACT
The COVID-19 global pandemic greatly affected pork processing plants in the United States. These pork processing plants were forced to either temporarily close or operate at reduced capacity due to the increased number of health-related employee absences. Because finishing pigs could not be timely marketed, methods to reduce growth performance were required to keep pigs from becoming too heavy at slaughter weight. Therefore, our objective was to determine the extent that reducing dietary standardized ileal digestible (SID) Lys and tryptophan-to-lysine ratio (TrpLys) ratio would slow finishing pig average daily gain (ADG) in a commercial setting. A total of 1,080 finishing pigs (327 × 1050, PIC; initially 32.3 kg) were used in a 119-d growth trial. Pigs were allotted by initial body weight (BW) and randomly assigned to 1 of 4 dietary treatments in a completely randomized block design with 27 pigs per pen and 10 pens per treatment. Three dietary regimes were formulated to contain either 100%, 90%, or 80% of the estimated SID Lys requirement for pigs in this facility, with a SID TrpLys ratio of 19%, with the exception of the last dietary phase formulated to 17% SID TrpLys. Seven different dietary phases were fed. The SID Lys concentrations in the 100% diets were 1.10%, 1.01%, 0.91%, 0.83%, 0.79%, 0.71%, or 0.67% SID Lys from 32 to 40, 40 to 51, 51 to 72, 72 to 85, 85 to 98, 98 to 112, and 112 to 130 kg, respectively. A fourth regime was formulated to 80% SID Lys with a SID TrpLys ratio of 16% (80-16% SID TrpLys) throughout all phases. Overall from d 0 to 119, ADG (linear, P < 0.001), final BW (linear, P < 0.001), and gain-to-feed (GF) decreased (linear, P = 0.087) as SID Lys decreased from 100% to 80% of the estimated requirement. Pigs fed the 80-16% SID TrpLys diets had an additional decrease in ADG (P < 0.05) and GF (P < 0.10) compared with pigs fed 80% of the SID Lys requirement with the normal TrpLys ratio. The reduction in SID Lys (from 100% to 80%) and reduction in SID Lys and TrpLys ratio resulted in an 8.6 and 11.7 kg, respectively, decrease in final BW compared with pigs fed Lys and Trp at the requirement (100%). This study provides alternatives for pork producers to reduce growth rate of finishing pigs.
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Full text: Available Collection: International databases Database: MEDLINE Type of study: Experimental Studies / Randomized controlled trials Language: English Journal: Transl Anim Sci Year: 2022 Document Type: Article Affiliation country: Tas

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Full text: Available Collection: International databases Database: MEDLINE Type of study: Experimental Studies / Randomized controlled trials Language: English Journal: Transl Anim Sci Year: 2022 Document Type: Article Affiliation country: Tas