Comparative Analysis of Nutritional Components between Rongchang and Duroc Pig Skin
LI Wenjuan, XU Lanmeng, ZHANG Jie, LIAO Qinfeng, LI Longjiao, ZHANG Tinghuan, GUO Zongyi, HE Hang
1. College of Animal Science and Technology, Chongqing Three Gorges Vocational College, Chongqing 404155, China; 2. College of Animal Science and Technology, Southwest University, Chongqing 402460, China; 3. Chongqing Academy of Animal Sciences, Chongqing 402460, China; 4. National Center of Technology Innovation for Pigs, Chongqing 402460, China
Abstract：The national standard methods were used to analyze and compare the routine nutrients, amino acids and fatty acids of Rongchang and Duroc pig skin and to evaluate their nutritional quality. The results showed that the difference in routine nutrient composition between Rongchang and Duroc pig skin was not significant (P > 0.05). Four saturated fatty acids (SFA), 3 monounsaturated fatty acids and 2 polyunsaturated fatty acids (PUFA) were detected in pig skin from each breed. Rongchang pig skin contained significantly more cardamom acid, palmitic acid and arachidic acid but less stearic acid, eicosapentaenoic acid, linoleic acid and linolenic acid compared to Duroc pig skin (P < 0.05). Altogether, 17 amino acids were identified in pig skin from each breed, the contents of valine and leucine being significantly higher and the content of tyrosine being significantly lower in Rongchang Duroc pig skin than in Duroc pig skin (P < 0.05). In addition, the amino acid scores (AAS) and chemical scores (CS) for valine and leucine, the ratio of total essential to total non-essential amino acids (ΣEAA/ΣNEAA), the ratio of total essential to total amino acids (ΣEAA/TAA), hypercholesterolemia index (HI), atherosclerosis index (AI) and thrombosis index (TI) were significantly higher (P < 0.05), essential amino acid index (EAAI) was slightly but not significantly higher (P > 0.05), and total PUFA (ΣPUFA), and the ratio of total unsaturated to total SFA (ΣUFA/ΣSFA), and the ratio of ΣPUFA/ΣSFA was significantly lower in Rongchang pig skin than in Duroc pig skin (P < 0.05). In summary, pig skin is rich in protein and fat and can be used as a source of feed protein and fat, as well as developed into new types of food or a nutritional supplement according to its nutritional characteristics. Rongchang pig skin has a high nutritional value in terms of amino acids, and Duroc pig skin in terms of fatty acids.
2024, Vol. 38 
