RESEARCHPAPER

Effects of Grazing on Growth Performance, Carcass Traits and Muscle Quality of Sushan Pigs in Late Fattening Period

  • LI Bixia ,
  • REN Shouwen ,
  • ZHAO Weimin ,
  • FU Yanfeng ,
  • WANG Xuemin ,
  • TU Feng
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  • Jiangsu Germplasm Resources Protection and Utilization Platform, Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China

Received date: 2021-11-07

  Online published: 2022-06-14

Abstract

The purpose of this experiment was to study the effects of grazing on the growth performance, carcass traits and the content of amino acids and fatty acids in muscle of Sushan pigs in late fattening period. A total of 80 healthy Sushan pigs (half male and half female) with a body weight of (75.0±2.0) kg were randomly divided into grazing group and control group, with 2 replicates in each group and 20 pigs in each replicate. The pigs in the grazing group grazed in the orchard from 11:00 to 17:00 every day and freely fed on ryegrass, Russian grass and other green feeds. The pigs in the control group were fed in pigsties. The pre-experiment lasted for 7 days and the experiment lasted for 30 days. The results showed as follows:1) the average daily gain and slaughter rate of grazing group were lower than those of control group (P<0.05). The carcass bone rate of grazing group was higher than that of control group, and the difference was very significant (P<0.01). 2) The water loss rate of longissimus dorsi muscle of grazing group was lower than that of control group (P<0.01). lightness (L*) and redness (a*) values of longissimus dorsi muscle of grazing group were higher than those of the control group, and yellowness (b*) value was lower than that of the control group, but the difference did not reach a significant level (P>0.05). 3) The unsaturated fatty acid contents in longissimus dorsi muscle of grazing group were higher than those of control group, and the total saturated fatty acid contents were lower than those of control group, but the difference was not significant (P>0.05). Valine content in longissimus dorsi muscle of grazing group was higher than that of control group, and cystine content was lower than that of control group (P<0.01). 4) The contents of total essential amino acids, total fresh amino acids and total amino acids in longissimus dorsi muscle of grazing group were lower than those of control group, but the difference was not significant (P>0.05). Palmitoleic acid content in longissimus dorsi muscle of grazing group was higher than that of control group (P<0.05). Saturated fatty acids such as lauric acid, stearic acid and arachidonic acid contents were lower than those of the control group, and the differences were very significant (P<0.01). In conclusion, the grazing of Sushan pig in the later stage of fattening has no significant effect on its growth performance, but it can improve its carcass traits and muscle quality to a certain extent. It is an important breeding model for the production of high-quality pork.

Cite this article

LI Bixia , REN Shouwen , ZHAO Weimin , FU Yanfeng , WANG Xuemin , TU Feng . Effects of Grazing on Growth Performance, Carcass Traits and Muscle Quality of Sushan Pigs in Late Fattening Period[J]. Chinese Journal of Animal Nutrition, 2022 , 34(6) : 3529 -3536 . DOI: 10.3969/j.issn.1006-267x.2022.06.015

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