Abstract
Simple SummaryThis study was conducted to assess the effects of different Se sources on the growth performance, carcass performance, meat quality and shelf life of fattening pigs. A control diet was supplemented with SS, and experimental diets were supplemented SY, Se-Met, and SS + Se-Met, respectively. The data showed that using organic Se in fattening pig’s diet could improve meat quality and prolong the shelf life of pork. Thus, replacing inorganic Se in diet with organic Se improved meat quality and pork shelf life of fattening pigs significantly under the conditions of the current study.The aim of this study was to evaluate the effects of different Se sources on the meat quality and shelf life of fattening pigs. The control diet was supplemented with 0.3 mg/kg of Se from sodium selenite (SS), and experimental diets included 0.3, 0.3 and 0.15 + 0.15 mg/kg of Se from Se-enriched yeast (SY), selenomethionine (Se-Met) and SS + Se-Met, respectively. The results showed that using organic Se or Se + Se-Met in fattening pigs’ diet could increase average daily gain (ADG) (p < 0.05), decrease F/G (p < 0.05), reduce (p < 0.01) moisture, drip loss and cooking loss of longissimus thoracis, as well as increase (p < 0.05) protein and fat contents of longissimus thoracis. Diet supplementation with SY or Se + Se-Met could increase (p < 0.01) back fat thickness and skin thickness, and SY could increase (p < 0.01) belly fat rat. Adding SY or Se + Se-Met could reduce (p < 0.01) L value (45 min, 24 h). Adding Se-Met could decrease (p < 0.01) b value (45 min, 24 h), adding Se + Se-Met could reduce b value (45 min), and adding SY could reduce the b value (24 h). However, there were no (p < 0.05) significant effects on dressing percentage, carcass sloping length, eye muscle area, pH, a value (45 min) and a value (24 h) of longissimus thoracis. Moreover, the TVB-N contents of longissimus thoracis on the first and fifth days, the numbers of Lactobacillus on the third to seventh days and the numbers of E. coli in in the fifth to seventh days of longissimus thoracis were reduced (p < 0.01) by diet supplementation with organic Se. In conclusion, all the results indicate that replacing inorganic Se in diet with organic Se could improve meat quality of fattening pigs. In addition, organic Se could reduce the total volatile basic nitrogen (TVB-N) contents of longissimus thoracis and reduce the numbers of E. coli and Lactobacillus in longissimus thoracis, prolonging the shelf life of pork. These results demonstrated that organic Se supplementation was more effective than SS supplementation for meat quality and the shelf life of fattening pigs.
Highlights
Selenium (Se), an important trace mineral, is essential for animal nutrition
Numerous experimental studies have since established that Se-Met and Se-enriched yeast (SY) are suitable for nutritional Se supplementation [9,10,11]
One hundred and sixty 110-d-old crossbred (Duroc × Landrace × Large White) pigs with body weight (BW) of 62.06 ± 0.54 kg were allocated to 16 pens (5 barrows and 5 gilts/pen), and the pens were assigned randomly to 4 treatments with 4 pens per treatment
Summary
Selenium (Se), an important trace mineral, is essential for animal nutrition. It is the component of at least 25 selenoproteins that participate in redox balance maintenance and antioxidant defences [1].Adding appropriate levels of inorganic Se (such as sodium selenite (SS)) to the diet can promote the growth and development of animals, but excessive intake of Se will cause some negative effects, such as lower intake, growth inhibition, hair loss, hoof loss, cirrhosis and anemia [2,3]. Selenium (Se), an important trace mineral, is essential for animal nutrition. It is the component of at least 25 selenoproteins that participate in redox balance maintenance and antioxidant defences [1]. Se-enriched yeast (SY)) had lower toxicity, higher bioavailability and lower environmental pollution in animal production and application [4,5,6]. SY is the organic Se enriched in the protein structure of growing yeast cells, mainly in the form of Se-Met (75%), in addition, there are Se organic compounds such as selenocysteine and methyl selenocysteine [7,8]. Numerous experimental studies have since established that Se-Met and SY are suitable for nutritional Se supplementation [9,10,11]
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