Effects of Different Supplemental Levels of Lysine in Low Protein Diets on Performance, Carcass Traits, Meat Quality and Nitrogen Excretion of Finishing Pigs

ZHOU Hua; CHEN Daiwen; HE Ju; LUO Yuheng; MAO Xiangbing; YU Jie; ZHENG Ping; LUO Junqiu; YU Bing

doi:10.3969/j.issn.1006-267x.2019.10.015

2019 , Vol. 31 >Issue 10: 4519 - 4526

DOI: https://doi.org/10.3969/j.issn.1006-267x.2019.10.015

Effects of Different Supplemental Levels of Lysine in Low Protein Diets on Performance, Carcass Traits, Meat Quality and Nitrogen Excretion of Finishing Pigs

ZHOU Hua ,
CHEN Daiwen ,
HE Ju ,
LUO Yuheng ,
MAO Xiangbing ,
YU Jie ,
ZHENG Ping ,
LUO Junqiu ,
YU Bing

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Key Laboratory for Animal Disease, Resistance Nutrition of Ministry of Education and Sichuan Province, Institute of Animal Nutrition, Sichuan Agricultural University, Chengdu 611130, China

Received date: 2019-03-29

Online published: 2019-10-17

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Abstract

This study was conducted to investigate the effect of different supplemental levels of lysine in low protein diets on performance, carcass traits, meat quality and nitrogen excretion of finishing pigs. In experiment 1, a total of 108 healthy "Durco×Landrace×Large White" finishing pigs with average initial body weight of (78.19±6.69) kg were assigned into 6 groups with 6 replicates per group and 3 pigs per replicate. Group 1 was normal protein level diet group, which was 12.5% crude protein (CP) and 0.73% standardized ileal digestible lysine (SID-Lys); groups 2, 3, 4, 5 and 6 were low protein level diet (10.5% CP) and different SID-Lys groups with the SID-Lys levels were 0.58%, 0.66%, 0.73%, 0.80% and 0.88%, respectively. The experiment lasted for 28 days. In experiment 2, eighteen "Durco×Landrace×Large White" finishing pigs with average initial body weight of (90.56±3.28) kg were assigned into 3 groups with 6 replicates per group and 1 pig per replicate. Pigs in the 3 groups were fed the same diets of groups 1, 4 and 5 in experiment 1, respectively. The experiment lasted for 7 days include 3 days preliminary experiment period and 4 days nitrogen balance experiment period. The results showed as follows:1) reducing dietary protein level had no significant effects on growth performance of finishing pigs (P>0.05). Different supplemental levels of lysine in low protein diets had no significant effects on growth performance of finishing pigs (P>0.05). 2) Reducing dietary protein level had no significant effects on carcass traits of finishing pigs (P>0.05), but significant affected the Longissimus dorsi redness value of finishing pigs (P<0.05). Different supplemental levels of lysine in low protein diets had no significant effects on carcass traits of finishing pigs (P>0.05), but significant affected the Longissimus dorsi drip loss of finishing pigs (P<0.05). 3) Reducing dietary protein level significant affected the fecal nitrogen excretion, urine nitrogen excretion and total nitrogen excretion of finishing pigs (P<0.05). Different supplemental levels of lysine in low protein diets had no significant effects on fecal nitrogen excretion, urine nitrogen excretion and total nitrogen excretion of finishing pigs (P>0.05). Collectively, reducing dietary protein level have no significant effects on growth performance and carcass traits of finishing pigs, but improve the meat color and decrease the nitrogen excretion. Different supplemental levels of lysine in low protein diets have no significant effects on growth performance, carcass traits and nitrogen excretion of finishing pigs, but improve the meat quality.

Key words： low protein level diet; lysine; growth performance; carcass traits; meat quality; nitrogen excretion; finishing pigs

Cite this article

ZHOU Hua , CHEN Daiwen , HE Ju , LUO Yuheng , MAO Xiangbing , YU Jie , ZHENG Ping , LUO Junqiu , YU Bing . Effects of Different Supplemental Levels of Lysine in Low Protein Diets on Performance, Carcass Traits, Meat Quality and Nitrogen Excretion of Finishing Pigs[J]. Chinese Journal of Animal Nutrition, 2019 , 31(10) : 4519 -4526 . DOI: 10.3969/j.issn.1006-267x.2019.10.015

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