9397至尊信誉威尼斯

添加蛋氨酸和饲养密度对肉鸡的抗氧化状态、脂肪酸谱和生长性能的影响

发布单位:9397至尊信誉农牧科技集团有限企业

查看次数:400

时间:2020-06-23
高密度饲养的肉鸡容易受到氧化和炎症损伤,往往会导致健康状况、生长性能和肉质受损。本研究旨在确定,增加鸡只饲养密度,额外添加30%的DL-蛋氨酸是否能够减轻或预防这些不利影响的发生。

选择560只小公鸡随机分为4组:2个饲养密度(9和12只/m2)和2个蛋氨酸补充量(生长期:2.90或3.77 g/kg和育成期:2.60或3.38 g/kg)。每周记录生长情况。在每个周期结束时采集血液和组织样本。

结果表明,在生长和育成期,高密度饲养降低了鸡只的体重和生长性能(P < 0.05);而额外补充的蛋氨酸部分的减弱了这些差异。在两个年龄段中,高蛋氨酸组鸡只大腿的谷胱甘肽浓度提高(> 24%,P < 0.05)。在生长期,高密度饲养提高了鸡只血浆、胸部和大腿的谷胱甘肽浓度(> 28%,P < 0.05);但是降低了生长期肝脏和育成期大腿中的谷胱甘肽水平(P < 0.05)。在鸡只生长期肝脏和育成期胸部、大腿和脂肪组织中的抗氧化酶谷胱甘肽S-转移酶活性方面,日粮蛋氨酸和饲养密度之间存在互作效应(P < 0.05)。在育成期鸡只大腿的谷胱甘肽过氧化物酶和超氧化物歧化酶活性方面也发现了蛋氨酸和饲养密度的互作效应。在育成期,额外补充蛋氨酸降低了热休克蛋白90(18%)的肝基因表达(P < 0.05),减少了大腿和胸部丙二醛水平(35%)。

综上所述,添加30%的DL-蛋氨酸能够部分的减轻饲养密度增加所带来的不良影响,改善肉鸡的氧化还原状态。

Supplemental methionine and stocking density affect antioxidant status, fatty acid profiles, and growth performance of broiler chickens

Broilers stocked in high densities may be prone to oxidative and inflammatory insults, resulting in impaired health status, growth performance, and meat quality. This study was to determine if 30% extra supplemental DL-methionine alleviated or prevented those adverse effects of a higher stocking density in broiler chickens. A total of 560 male Cornish Cross cockerels (day old) were divided into four groups: two stocking densities (9 and 12 birds/m2) and two supplementations of methionine (grower: 2.90 or 3.77 g/kg and finisher: 2.60 or 3.38 g/kg). Growth performance was recorded weekly. Blood and tissues were sampled at the end of each period. High stocking density decreased (P < 0.05) body weight and growth performance of growers and (or) finishers. Those differences were partially attenuated by the extra methionine supplementation. The high methionine elevated (P < 0.05) glutathione (GSH) concentration in the thigh at both ages (> 24%). The high stocking density elevated (>28%, P < 0.05) glutathione concentration in the plasma, breast, and thigh of growers, but decreased (P < 0.05) it in the liver of growers and thigh of finishers. Interaction effects (P < 0.05) between dietary methionine and stocking density were found on activities of the antioxidant enzyme glutathione S-transferase in the liver of growers and breast, thigh, and adipose tissue of finishers. The interaction effect was also found on activities of glutathione peroxidase and superoxide dismutase in the thigh of growers. The extra methionine decreased (P < 0.05) hepatic gene expression of heat shock protein 90 (18%) and thigh and breast malondialdehyde concentrations of the finishers (35%). In conclusion, the 30% extra DL-methionine supplementation was able to partially mitigate adverse effects caused by the higher stocking density and to improve the redox status of the broilers.

文章来源:猪营养国际论坛
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