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农场和运输过程中的死亡风险:比较两种具有不同生长速度的肉杂交品种
Merete Forseth1, Randi O Moe2, Käthe Kittelsen3
1Norsk Kylling AS, 7300 Orkanger, Norway.
Poultry science
|January 10, 2024
概括
肉杂交基因显著影响死亡率. 快速生长的罗斯308肉比缓慢生长的哈巴德JA787肉的死亡率更高,特别是在运输过程中和第一周后. 为了预防,需要进一步的研究.
科学领域:
- 禽畜科学 禽畜科学 禽畜科学
- 动物养殖 动物养殖
- 兽医流行病学 兽医流行病学
背景情况:
- 肉的死亡率是一个重要的福利和经济问题,通常与快速生长的遗传选择有关.
- 虽然有实验数据,但在商业条件下对肉死亡率的全面了解,特别是对于增长较慢的品种,仍然有限.
研究的目的:
- 为了研究和比较两种不同生长速度的肉杂交物种在农场和运输期间的死亡风险:罗斯308和哈伯德JA787.
- 分析肉杂交类型与不同生产阶段的死亡率之间的关联:第一周死亡率 (FWM),第一周后死亡率 (MAFW) 和到达时死亡率 (DOA).
主要方法:
- 一项回顾性队列研究分析了从2015年1月到2021年6月的4,228个群体和139个农场的64,651,804只肉的数据.
- 农场内死亡率分析的重点是2017年7月至2018年7月间屠宰的牲畜.
- 混合效应负双项回归模型被用来评估混合物对不同生产阶段死亡率的影响.
主要成果:
- 与Hubbard JA787相比,罗斯308肉在所有阶段的平均死亡率都更高:1.40%的FWM与0.76%,3.05%的MAFW与1.49%,0.063%的DOA与0.015%.
- 在DOA中观察到最大的差异,在寒冷条件下,罗斯308的死亡率 (IRR:4.70) 几乎是寒冷条件下的5倍.
- 罗斯308在秋季显示FWM风险大约是1.6倍 (IRR:1.56) 和MAFW风险是2倍 (IRR:2.13),与哈巴德JA787.7.相比.
结论:
- 遗传因素,特别是肉杂交类型和生长速度,与商业环境中的不同死亡风险有很大关系.
- 这些发现强调了需要有针对性的预防策略,考虑到在不同生产阶段对死亡的遗传倾向.
- 进一步研究肉死亡的多因素原因,包括遗传影响,对于改善羊群健康和福利至关重要.
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