研究笔记:用水施加直接养的微生物减少了热应激 brojlers 的死亡率
S A S van der Klein1, M Bernardeau1, K Gibbs1
1Danisco Animal Nutrition and Health (IFF), 2342 BH, Oegstgeest, The Netherlands.
Poultry science
|May 26, 2024
概括
一种含有 Lactobacillus acidophilus AG01 和 Bifidobacterium animalis AG02 的直接养微生物 (DFM) 产品在热应激条件下显著降低了 brojler 的死亡率. 虽然增长表现没有得到改善,但DFM提高了对与热有关的死亡率的抵御力.
科学领域:
- 动物科学动物科学
- 禽类的营养 养
- 微生物学 微生物学
背景情况:
- 在家禽中使用抗生素正在受到审查,推动了针对肠道健康的直接养微生物 (DFM) 等替代品的研究.
- 热应激对肉的肠道健康和表现产生负面影响.
- 环境压力管理工具是减轻家禽环境压力因素的负面影响的潜在工具.
研究的目的:
- 为了评估用水管理的DFM产品在夏季热压期间对 brojler性能和健康的有效性.
- 评估一种特定的双菌株DFM (Lactobacillus acidophilus AG01和Bifidobacterium animalis AG02) 对肉受高温影响的影响.
主要方法:
- 肉 (Ross 308) 被分配到对照组或DFM治疗组 (1x10^8 CFU/鸟/天).
- 鸟类被安置在地板里,并食标准的三阶段饮食.
- 在42天内记录了生长表现 (体重,料摄入量,料转换率) 和死亡率,鸟类经历了自然热应激.
主要成果:
- 对照组和DFM组之间没有观察到生长表现的显著差异;然而,在第42天的体重在两者之间均低于品种标准的19%.
- 在第一到第四十二天之间,DFM治疗显著降低了整体死亡率,从5.83%降至0.83% (P = 0.027).
- 由于热应激和缺氧,在完成者阶段 (25-42天) 的死亡率在DFM组 (0.44%) 与对照组 (2.88%) 相比显著较低.
结论:
- 双菌株的DFM补充剂显示出对肉中热应激诱导的死亡率有显著的保护作用.
- DFM可能会增强肠道平衡和屏障功能,有助于增加对环境压力因素 (如热应激) 的抵抗力.
- 需要进一步的研究,以阐明这种DFM提高肉在热应激下抵抗力的具体机制.
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