Associations between skin lesion counts, hair cortisol concentrations and reproductive performance in group housed sows
Associations between skin lesion counts, hair cortisol concentrations and reproductive performance in group housed sows
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DOI：
10.1016/j.livsci.2021.104463
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发表时间：
2021-03-11
影响因子：
1.8
通讯作者：
Boyle, Laura A.
中科院分区：
文献类型：
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作者：
Lagoda, Martyna E.;O'Driscoll, Keelin;Boyle, Laura A.
急性应激对母猪繁殖性能的影响已得到充分证实，但我们对慢性应激对母猪繁殖性能的影响知之甚少。本研究调查了混合后24小时和3周的总皮肤病变计数、妊娠结束时的毛发皮质醇浓度与母猪繁殖性能之间的关联。对母猪（n = 264;产次1-5）进行人工授精，并在服务后立即将其锁定在11个完全板条妊娠围栏内的单独饲养栏中。母猪在服务后约25天从畜栏中释放，允许混合，此后可以自由进入畜栏。混合后24小时（即从畜栏释放后1天）和混合后3周，对前部（头部、颈部、肩部和前腿）、中部（侧腹和背部）和后部（臀部、后腿和尾部）的皮肤病变进行计数。所有部位的计数总和得出每头母猪的总皮肤病变计数。在分娩前一周进行背部脂肪深度测量和毛发收集。母猪繁殖性能指标包括活产仔猪数、死产仔猪数、木乃伊仔猪数和总产仔数。对75头母猪的仔猪进行标记、称重并对活力（0 =最低活力，至4 =完美）和子宫内生长迟缓（IUGR; 0 =无，至3 =严重）进行评分。混合后3周的总皮肤病变计数与木乃伊仔猪数量（P = 0.045）和IUGR评分（P = 0.018）呈正相关。混合后24小时（Rho = 0.10; P > 0.05）或3周（Rho = -0.02; P > 0.05）的总皮损计数与毛发皮质醇浓度之间无相关性。毛发皮质醇浓度与母猪繁殖性能指标之间也无相关性（P > 0.05）。混合后3周较高的皮肤病变计数与母猪繁殖性能相关。这表明，持续的攻击行为造成的慢性压力对生殖系统产生了负面影响。然而，由于毛发皮质醇、皮肤病变计数和生殖性能指标之间缺乏显著相关性，因此毛发皮质醇的研究结果并不支持这一观点。
The effects of acute stress on sow reproductive performance are well established, but we know less about the implications of chronic stress for sow performance. This study investigated associations between total skin lesion counts 24hr and 3 weeks post-mixing, hair cortisol concentrations at the end of pregnancy, and reproductive performance of sows. Sows (n = 264; parity 1-5) were artificially inseminated and locked into individual feeding stalls within 11 fully slatted gestation pens, immediately after service. Sows were released from the stalls at approximately 25 days post-service, allowed to mix, and thereafter had free access to the stalls. Skin lesions were counted 24hr post-mixing (i.e. one day after release from the stalls), and 3 weeks post-mixing on the anterior (head, neck, shoulders and front legs), middle (flanks and back), and posterior (rump, hind legs and tail). The sum of counts across all sites yielded a total skin lesion count for each sow. Back fat depth measurement and hair collection were carried out one week prior to farrowing. Sow reproductive performance measures included the number of piglets born alive, born dead, mummified, and total born. Piglets from 75 sows were tagged, weighed and scored for vitality (0 = least vital, to 4 = perfect) and intra-uterine growth retardation (IUGR; 0 = none, to 3 = severe). There was a positive association between total skin lesion counts 3 weeks post-mixing and both the number of mummified piglets (P = 0.045), and IUGR scores (P = 0.018). There was no correlation between total skin lesion count either 24hr (Rho = 0.10; P > 0.05) or 3 weeks post-mixing (Rho = -0.02; P > 0.05) and hair cortisol concentrations. There was also no association between hair cortisol concentrations and measures of sow reproductive performance (P > 0.05). Higher skin lesion counts 3 weeks post-mixing were associated with aspects of sow reproductive performance. This suggests that chronic stress caused by sustained aggression had a negative impact on the reproductive system. Nevertheless, given the lack of significant associations between hair cortisol, skin lesion counts, and measures of reproductive performance, this was not supported by the findings for hair cortisol.