Effects of Dietary Energy Levels on Growth Performance, Serum Biochemical Indices and Meat Quality of Growing-Finishing Pigs in High Temperature and High Humidity Environment

YANG Wei; LONG Dingbiao; WANG Hao; LIU Zuohua; LAN Yunxian; PU Shihua

doi:10.3969/j.issn.1006-267x.2020.04.018

2020 , Vol. 32 >Issue 4: 1605 - 1615

DOI: https://doi.org/10.3969/j.issn.1006-267x.2020.04.018

Effects of Dietary Energy Levels on Growth Performance, Serum Biochemical Indices and Meat Quality of Growing-Finishing Pigs in High Temperature and High Humidity Environment

YANG Wei ,
LONG Dingbiao ,
WANG Hao ,
LIU Zuohua ,
LAN Yunxian ,
PU Shihua

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1. College of Animal Science, Southwest University, Chongqing 402460, China;
2. Chongqing Academy of Animal Science, Chongqing 402460, China

Received date: 2019-09-28

Online published: 2020-04-16

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Abstract

The aim of this study was to investigate the effects of different dietary digestive energy (DE) levels on growth performance, serum biochemical indices and meat quality of growing-finishing pigs in high temperature and high humidity environment, in order to determine the appropriate DE level in growing-finishing pigs. A total of 50 healthy Duroc×Landrace×Yorkshire growing pigs with an average initial body weight of (40.0±2.0) kg were randomly divided into 5 groups with 10 replicates in each group (7 barrows and 3 gilts) and 1 pig per replicate. Pigs in five groups were fed diets with DE levels of 13.68, 13.88, 14.09, 14.30 and 14.51 MJ/kg, respectively. The test period was 90 days. The results showed as follows:1) in the high temperature and high humidity environment, with the increase of DE level, the average daily feed intake of the pigs in growing period, finishing period and the whole period showed a downward trend, while the average daily gain (ADG) increased first and then decreased and the feed to gain ratio decreased first and then increased. The curve equations between ADG of pigs in growth period and the whole period and dietary DE level were Y₁=-878.02X²+24 708.94X-173 289.53 (R²=0.69, P<0.01) and Y₂=-436.56X²+12 276.96X-85 600.33 (R²=0.54, P<0.05), respectively; when the ADG reached the maximum, the corresponding dietary DE level was 14.07 and 14.06 MJ/kg, respectively. 2) Dietary DE level had significant effects on serum contents of total protein, high-density lipoprotein cholesterol and immunoglobulin G (IgG) of growing-finishing pigs (P<0.05), and with the highest values in the 14.09 MJ/kg DE group (P<0.05). 3) Dietary DE level had extremely significant effect on serum lipoprotein lipase activity (P<0.01) and significant effect on serum lipase (LPS) activity (P<0.05), respectively, but had no significant effects on serum malate dehydrogenase activity and contents of adiponectin and growth hormone (P>0.05) of growing-finishing pigs. The curve equation between serum LPS activity of pigs and dietary DE level was Y₃=133.00X²-3 761.26X+26 664.78 (R²=0.83, P<0.05), when the serum LPS activity was the lowest, the corresponding DE level was 14.14 MJ/kg. 4) With the increase of dietary DE level, the sebum rate of growing-finishing pigs increased significantly (P<0.05), and the muscle drip loss and shear force decreased significantly (P<0.05), while the meat quality of the 14.09 MJ/kg DE group was the best, and the drip loss and shear force were significantly lower than those of 13.68 MJ/kg DE group (P<0.05). The curve equations between pork drip loss, shear force and dietary DE level were Y₄=0.70X²-19.92X+143.25 (R²=0.96, P<0.05) and Y₅=2.88X²-82.20X+590.36 (R²=0.99, P<0.05), when the muscle drip loss and the shear force were at minimum, the corresponding dietary DE level was 14.23 and 14.27 MJ/kg, respectively.

Key words： high temperature and high humidity; growing-finishing pigs; digestive energy; grwoth performance; serum biochemical indices; meat quality

Cite this article

YANG Wei , LONG Dingbiao , WANG Hao , LIU Zuohua , LAN Yunxian , PU Shihua . Effects of Dietary Energy Levels on Growth Performance, Serum Biochemical Indices and Meat Quality of Growing-Finishing Pigs in High Temperature and High Humidity Environment[J]. Chinese Journal of Animal Nutrition, 2020 , 32(4) : 1605 -1615 . DOI: 10.3969/j.issn.1006-267x.2020.04.018

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