title: The Expression of Carnosine and Its Effect on the Antioxidant Capacity of Longissimus dorsi Muscle in Finishing Pigs Exposed to Constant Heat Stress.
abstract: The objective of this study was to assess the effects of constant high ambient temperatures on meat quality, antioxidant capacity, and carnosine expression in longissimus dorsi muscle of finishing pigs. Castrated 24 male DLY (crossbreeds between Landrace×Yorkshire sows and Duroc boars) pigs were allocated to one of three treatments: constant ambient temperature at 22°C and ad libitum feeding (CON, n = 8); constant high ambient temperature at 30°C and ad libitum feeding (H30, n = 8); and constant ambient temperature at 22°C and pair-fed with H30 (PF, n = 8). Meat quality, malondialdehyde (MDA) content, antioxidant capacity, carnosine content, and carnosine synthetase (CARNS1) mRNA expression in longissimus dorsi muscle were measured after three weeks. The results revealed that H30 had lower pH24 h, redness at 45 min, and yellowness at 24 h post-mortem (p<0.05), and higher drip loss at 48 h and lightness at 24 h post-mortem (p<0.01). Constant heat stress disrupted the pro-oxidant/antioxidant balance in longissimus dorsi muscle with higher MDA content (p<0.01) and lower antioxidant capacity (p<0.01). Carnosine content and CARNS1 mRNA expression in longissimus dorsi muscle of H30 pigs were significantly decreased (p<0.01) after three weeks at 30°C. In conclusion, constant high ambient temperatures affect meat quality and antioxidant capacity negatively, and the reduction of muscle carnosine content is one of the probable reasons.
authors.affiliation: Department of Animal Science, Shandong Agricultural University, Taian, Shandong 271018, China .
authors.forename: Peige
authors.initials: P
authors.lastname: Yang
authors.affiliation: Department of Animal Science, Shandong Agricultural University, Taian, Shandong 271018, China .
authors.forename: Yue
authors.initials: Y
authors.lastname: Hao
authors.affiliation: Department of Animal Science, Shandong Agricultural University, Taian, Shandong 271018, China .
authors.forename: Jinghai
authors.initials: J
authors.lastname: Feng
authors.affiliation: Department of Animal Science, Shandong Agricultural University, Taian, Shandong 271018, China .
authors.forename: Hai
authors.initials: H
authors.lastname: Lin
authors.affiliation: Department of Animal Science, Shandong Agricultural University, Taian, Shandong 271018, China .
authors.forename: Yuejin
authors.initials: Y
authors.lastname: Feng
authors.affiliation: Department of Animal Science, Shandong Agricultural University, Taian, Shandong 271018, China .
authors.forename: Xin
authors.initials: X
authors.lastname: Wu
authors.affiliation: Department of Animal Science, Shandong Agricultural University, Taian, Shandong 271018, China .
authors.forename: Xin
authors.initials: X
authors.lastname: Yang
authors.affiliation: Department of Animal Science, Shandong Agricultural University, Taian, Shandong 271018, China .
authors.forename: Xianhong
authors.initials: X
authors.lastname: Gu
keywords: Antioxidants; Carnosine; Heat Stress; Meat Quality; Pigs