Dietary supplementation with pioglitazone hydrochloride and L-carnosine improves the growth performance,muscle fatty acid profiles and shelf life of yellow-feathered broiler chickens

The present study aimed to investigate the effects of dietary pioglitazone hydrochloride(PGZ)and L-carnosine(LC)supplementation on the growth performance,meat quality,antioxidant status,and meat shelf life of yellow-feathered broiler chickens.Five hundred broiler chickens were randomly assigned into 4 experimental diets using a 2×2 factorial arrangement with 2 PGZ supplemental levels(0 and 15 mg/kg)and 2 LC supplemental levels(0 and 400 mg/kg)in basal diets for 28 d.The feed-to-gain ratio decreased whereas the average daily gain increased with PGZ supplementation.Greater dressing per-centages,contents of intramuscular fat(IMF)in breast and thigh muscles,C18:3n-6,C18:1n-9 and monounsaturated fatty acid(MUFA)percentages of thigh muscle were observed with PGZ addition.Additionally,significant synergistic effects between PGZ and LC on the C18:1n-9 and MUFA contents were found.Supplementation with LC decreased drip loss,cooking loss and total volatile basic nitrogen,and increased the redness(a*)value,the superoxide dismutase and glutathione peroxidase activities in thigh muscles.Moreover,the malondialdehyde content decreased when diets were supplemented with LC,and there was a synergistic effect between PGZ and LC.Additionally,the mRNA abundance of lipogenesis-related genes,such as peroxisome proliferator-activated receptor y(PPARγ),PPARγco-activator 1αand fatty acid-binding protein 3,increased with PGZ supplementation,and relevant anti-oxidation genes,such as nuclear factor erythroid-2-related factor 2 and superoxide dismutase 1,were enhanced with LC supplementation.In conclusion,the results indicated that the supplementation of PGZ and LC could improve the growth performance,antioxidant ability,IMF content,and meat shelf life of yellow-feathered broiler chickens.

饲粮添加牛至油对天露黄鸡腹脂沉积的影响

【目的】探讨饲粮中添加牛至油对天露黄鸡腹脂沉积及脂肪代谢的影响,并通过模拟生产试验对牛至油降低肉鸡腹脂率效果进行验证。【方法】实验室试验:选取24只65日龄雌性天露黄鸡,逐只称质量编号后,根据体质量相近的原则,随机分为3组,每组8只,单笼饲养;对照组饲喂基础饲粮(不含牛至油),处理组分别饲喂含100和200 mg/kg牛至油的饲粮;试验开始前预饲喂3 d,正式试验时间为30 d,自由采食及饮水。模拟生产试验:选取270只65日龄雌性天露黄鸡,逐只称质量编号后,按照体质量相近的原则,随机分为3组,每组6次重复,每次重复15只,试验处理和饲养管理方法与实验室试验相同。实验室试验结束后称体质量计算生产性能指标,并屠宰,采集血液、肝脏、腹脂、胸肌、腿肌等样品,测定屠宰性能、血清生化指标和脂肪代谢相关基因的mRNA表达量。模拟生产试验结束后称体质量,并取样测定生产性能和屠宰性能,验证实验室试验结果。【结果】实验室试验中,与对照组相比,饲粮添加200 mg/kg牛至油可显著提高天露黄鸡的平均日增体质量和胸肌率,显著降低天露黄鸡的耗料增重化和脂肪沉积,腹脂减少率达到23.51%;显著降低天露黄鸡肝脏中与脂肪合成相关基因的mRNA表达量,对肝脏中脂肪分解相关基因无明显影响。模拟生产试验结果与实验室试验相符,验证了牛至油具有降低天露黄鸡腹脂沉积的作用,与对照组相比,200 mg/kg牛至油添加组的腹脂减少率达到20.00%。【结论】饲粮中添加200 mg/kg牛至油可显著降低天露黄鸡的腹脂沉积,其作用可能与降低肝脏脂肪酸的合成有关。

天露黑鸡不同周龄蛋品质变化规律研究

为明确黄羽肉种鸡蛋品质变化规律及蛋品质性状的相关性,试验对天露黑鸡父母代肉种鸡不同周龄种蛋进行测定和分析。结果表明,天露黑鸡父母代肉种鸡除蛋黄颜色外,其他指标均受周龄显著影响,蛋重和蛋壳重随着周龄增加而增加;蛋壳比例、哈氏单位随着周龄增加而下降;蛋壳强度和蛋壳厚度随着周龄增加先增加后下降。蛋重与蛋壳比例、哈氏单位呈极显著负相关(P<0.01);蛋壳强度与蛋壳厚度呈极显著正相关(P<0.01)。天露黑鸡父母代肉种鸡蛋品质多项指标受到周龄显著影响,在生产中可根据蛋品质变化规律,加强种蛋挑选,提升种蛋的孵化性能。