This study was conducted to investigate the effects of chromium from chromium propionate (CrPro) on serum lipids, carcass traits, and breast meat quality in heat-stressed birds. A total of 210 1-day-old male broilers were randomly allotted by initial body weight (BW) into 5 treatments with 7 replicates with 6 birds per replicate pen for 42 days. The treatments included a basal corn-soybean meal diet and basal diet supplemented with 0.2, 0.4, 0.8, or 1.6 mg Cr/kg diet. Birds had ad libitum access to feed and distilled-deionized water at normal conditions for 1–3 weeks with little or no stress, and then birds were housed under heat stress conditions with 35 ± 2 °C ambient temperature for 4–6 weeks. Results showed that serum triglyceride (TG) (P = 0.0006) and low-density lipoprotein cholesterol (LDLC) (P = 0.0038) concentrations were decreased linearly as Cr dose increased. Compared with other groups, birds receiving 0.8 or 1.6 mg Cr/kg had lower TG (P = 0.0015). Compared to control birds, birds fed diets with 0.2, 0.4, 0.8, or 1.6 mg Cr/kg supplementation had lower LDLC (P = 0.0006). However, the total cholesterol (TC) and high density lipoprotein cholesterol (HDLC) concentrations in serum were not affected by treatment (P > 0.05). No difference was observed in BW, the relative weights of breast muscle, thigh muscle and abdominal fat (P > 0.05), and breast meat quality (Ph15min, Ph24h, L*, a*, b*, cooking loss, shear force) among the treatments (P > 0.05). Results from this study indicated that CrPro supplementation could be beneficial to serum lipids metabolism of heat-stressed broiler chickens by decreasing TG and LDLC contents, but had no impacts on meat quality and carcass traits of the heat-stressed broilers.
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Compliance with Ethical Standards
All experimental procedures including the care, handling, and sampling of the birds were approved by the Animal Care and Use Committee of Southwest University for Nationalities.
This study was funded by the International Cooperative Project of Sichuan Province (grant number 2015HH0018).
Conflict of Interest
The authors declare that they have no conflict of interest.
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