Effects of the standardized ileal digestible lysine to metabolizable energy ratio on performance and carcass characteristics of growing-finishing pigs

Pengfei Li, Zhikai Zeng, Ding Wang, Lingfeng Xue, Rongfei Zhang, Xiangshu Piao

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

A total of 2,121 growing-finishing pigs (Duroc × Landrace × Large White) were utilized in six experiments conducted to determine the effects of different ratios of standardized ileal digestible lysine (SID-Lys) to metabolizable energy (ME) on the performance and carcass characteristics of growing-finishing pigs. Exps. 1 (30 to 50 kg), 2 (52 to 70 kg) and 3 (81 to 104 kg) were conducted to find an optimum ME level and then this level was used in Exps. 4 (29 to 47 kg), 5 (54 to 76 kg) and 6 (84 to 109 kg) to test the response of pigs to different ratios of SID-Lys:ME. In Exps.1 to 3, four treatments were used consisting of diets with a formulated ME content of 3.1, 3.2, 3.3 or 3.4 in Exps. 1 and 2 while Exp. 3 used 3.05, 3.15, 3.25 or 3.35 Mcal/kg. A constant SID-Lys:ME ratio of 2.6, 2.3 or 2.0 g/Mcal was used in Exps. 1, 2 and 3, respectively. Weight gain was significantly increased with increasing energy level in Exp.1 while weight gain was unaltered in Exps. 2 and 3. For all three experiments, feed intake was decreased (P < 0.05) and feed efficiency was improved (P < 0.05) with increasing energy level. Tenth rib back fat thickness linearly increased (P < 0.05) with increasing energy level. In Exps. 4 to 6, five treatments were used consisting of diets with a SID-Lys:ME ratio of 2.4, 2.6, 2.8, 3.0 or 3.2 in Exp. 1, 2.1, 2.3, 2.5, 2.7, 2.9 or 3.2 in Exp. 2 and 1.8, 2.0, 2.2, 2.4, or 2.6 in Exp. 3. A constant ME level 3.2, 3.2 and 3.05 Mcal/kg was used in Exps. 1, 2 and 3, respectively (selected based on the results of weight gain). For all three experiments, weight gain increased (P < 0.05) and feed efficiency improved linearly (P < 0.05) as the SID-Lys:ME ratio increased. Tenth rib back fat thickness linearly decreased (P < 0.05) as the SID-Lys:ME ratio increased. Based on a straight broken-line model, the estimated SID-Lys:ME ratio to maximize weight gain was 3.0, 2.43 and 2.2 for 29 to 47, 54 to76 and 84 to 109 kg of pigs, respectively.

Original languageEnglish (US)
Article number9
JournalJournal of Animal Science and Biotechnology
Volume3
Issue number1
DOIs
StatePublished - Mar 1 2012
Externally publishedYes

Bibliographical note

Funding Information:
The authors sincerely acknowledge the financial support received from the State Key Laboratory of Animal Nutrition (2004DA125184-0810) of China, National Natural Science Foundation of China (31072040), Guangdong cooperation project between Industry-Academia-Research of China (2009B090300110) and the Ministry of Science and Technology of the People’s Republic of China (2006BAD12B05-10; Nyhyzx07-34). Thanks the great support of MHA from Novus international Inc., and thank Dr. Thacker P. A. (University of Saskatchewan, Canada) for excellent assistance in editing this manuscript.

Keywords

  • Carcass characteristics
  • Growing-finishing pigs
  • Metabolizable energy
  • Performance
  • Standardized ileal digestible lysine

Fingerprint

Dive into the research topics of 'Effects of the standardized ileal digestible lysine to metabolizable energy ratio on performance and carcass characteristics of growing-finishing pigs'. Together they form a unique fingerprint.

Cite this