Norsk Kylling AS, Havneveien 43, 7300, Orkanger, Norway.
Norwegian University of Life Sciences, Universitetstunet 3, 1433, Ås, Norway.
Sci Rep. 2023 Mar 14;13(1):4195. doi: 10.1038/s41598-023-31422-0.
Experimental studies concluded that genetic factors enabling fast growth rate might negatively affect broiler health and welfare. Recently, the proportion of slower-growing broilers has been increasing. However, studies of health in broilers with different growth rates in commercial systems are still scarce. This repeated cross-sectional study aimed to describe causes of carcass condemnations in two broiler hybrids with different growth rates, Ross 308, and Hubbard JA787, and to estimate the effect of hybrid. The study sample consisted of 63,209,415 broilers slaughtered in 4295 batches from 139 farms. All broilers were slaughtered from January 1st, 2015, to June 22nd, 2021, by the same company (Norsk Kylling). All causes of condemnation, except fractures, were more prevalent in Ross 308. The five most common causes (ascites, discolouration, hepatitis, small and skin lesions) were investigated in greater detail, and the effect of hybrid was assessed using mixed effects negative binomial models with the condemnation codes as outcome variables. For the five selected causes, variation in prevalence between slaughter batches was considerable for Ross and minor for Hubbard. The notable differences between hybrids in prevalence and causes of condemnation have important implications for animal health, welfare, economy, and sustainability in broiler production.
实验研究得出结论，能够实现快速生长速度的遗传因素可能会对肉鸡的健康和福利产生负面影响。最近，生长速度较慢的肉鸡比例一直在增加。然而，在商业系统中对具有不同生长速度的肉鸡的健康进行研究仍然很少。这项重复横断面研究旨在描述两种生长速度不同的肉鸡杂种（罗斯 308 和哈伯德 JA787）的胴体废弃原因，并估计杂种的影响。研究样本包括 2015 年 1 月 1 日至 2021 年 6 月 22 日期间由同一家公司（挪威鸡肉）屠宰的 63,209,415 只肉鸡，来自 139 个农场的 4295 批肉鸡。除骨折外，罗斯 308 的胴体废弃原因更常见。对腹水、变色、肝炎、小病变和皮肤病变这五种最常见的原因进行了更详细的研究，并使用带有废弃代码作为结果变量的混合效应负二项式模型评估了杂种的影响。对于这五种选定的原因，罗斯的屠宰批次之间的流行率差异很大，而哈伯德的差异很小。杂种之间在废弃率和废弃原因方面的显著差异对肉鸡生产中的动物健康、福利、经济和可持续性具有重要意义。
