Effects of 25(OH)VD₃ on Growth Performance, Pork Quality and Calcium Deposit in Growing-Finishing Pigs.

ABSTRACT: The study was conducted to evaluate the effects of 25(OH)VD₃ with different inclusion levels of 0, 25, 50 and 75 μg/kg in the diet on growth performance, nutrient digestibility, bone properties and pork quality in growing-finishing pigs. The results showed that the average daily gain (p < 0.05) and body weight (p < 0.10) of pigs showed a trend of increasing quadratically as inclusion levels of 25(OH)VD₃ increased. Dietary supplementation of 50 μg/kg 25(OH)VD₃ increased calcium digestibility compared with the 0 μg/kg group (p < 0.05), and calcium and phosphorus digestibility increased quadratically as inclusion levels of 25(OH)VD₃ increased (p < 0.05). Dietary supplementation of 50 μg/kg 25(OH)VD₃ increased concentrations of polyunsaturated fatty acids, and decreased contents of saturated and monounsaturated fatty acids in the longissimus dorsi of pigs (p < 0.05). The addition of 25, 50 and 75 μg/kg 25(OH)VD₃ to the diet increased breaking strength and bone stiffness in the tibia compared with the 0 μg/kg group (p < 0.05). Dietary supplementation of 50 μg/kg 25(OH)VD₃ improved the activities of superoxide dismutase (SOD) and catalase (CAT), and increased the messenger RNA (mRNA) expression of Cu/Zn SOD in the longissimus dorsi compared with the 0 μg/kg group (p < 0.05). Supplementing 50 μg/kg 25(OH)VD₃ improved the mRNA expression of calcium-binding protein D9k (CaBP-D9k) and D28k (CaBP-D28K) in the liver compared with the 0 μg/kg 25(OH)D₃ group (p < 0.05). In conclusion, a diet with an added dose of 50 μg/kg 25(OH)VD₃ showed a greatest growth performance of growing-finishing pigs, and 25(OH)VD₃ enhanced calcium deposition and antioxidant capacity in the longissimus dorsi, which may be associated with improved expression of calcium ion channel proteins.

SUBMITTER: Zhang Z 

PROVIDER: S-EPMC9817873 | biostudies-literature | 2022 Dec

REPOSITORIES: biostudies-literature