当前位置: X-MOL 学术J. Anim. Sci. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Characterizing the effect of incrementally increasing dry bulb temperature on linear and nonlinear measures of heart rate variability in nonpregnant, mid-gestation, and late-gestation sows
Journal of Animal Science ( IF 2.7 ) Pub Date : 2022-01-12 , DOI: 10.1093/jas/skac004
Christopher J Byrd 1 , Betty R McConn 2 , Brianna N Gaskill 3 , Allan P Schinckel 3 , Angela R Green-Miller 4 , Donald C Lay 5 , Jay S Johnson 5
Affiliation  

Characterizing the sow physiological response to an increased heat load is essential for effective heat stress mitigation. The study objective was to characterize the effects of a 400-min heating episode on sow heart rate variability (HRV) at different reproductive stages. HRV is a commonly used noninvasive proxy measure of autonomic function. Twenty-seven sows were enrolled in the study according to their gestation stage at time of selection: 1) nonpregnant (NP; n = 7), 2) mid-gestation (MID; 57.3 ± 11.8 d gestation; n = 11), and 3) late-gestation (LATE; 98.8 ± 4.9 d gestation; n = 8). The HRV data utilized in the study were collected from each pig as the dry bulb temperature in the room increased incrementally from 19.84 ± 2.15 °C to 35.54 ± 0.43 °C (range: 17.1–37.5 °C) over a 400-min period. After data collection, one 5-min set of continuous heart rate data were identified per pig for each of nine temperature intervals (19–20.99, 21–22.99, 23–24.99, 25–26.99, 27–28.99, 29–30.99, 31–32.99, 33–34.99, and 35–36.99 °C). Mean inter-beat interval length (RR), standard deviation of r-r intervals (SDNN), root mean square of successive differences (RMSSD), high frequency spectral power (HF), sample entropy (SampEn), short-term detrended fluctuation analysis (DFAα1), and three measures (%REC, DET, LMEAN) derived from recurrence quantification analysis were calculated for each data set. All data were analyzed using the PROC GLIMMIX procedure in SAS 9.4. Overall, LATE sows exhibited lower RR than NP sows (P < 0.01). The standard deviation of r–r intervals and RMSSD differed between each group (P < 0.01), with LATE sows exhibiting the lowest SDNN and RMSSD and NP sows exhibiting the greatest SDNN and RMSSD. Late-gestation sows exhibited lower HF than both MID and NP sows (P < 0.0001), greater DFA values than NP sows (P = 0.05), and greater DET compared to MID sows (P = 0.001). Late-gestation also sows exhibited greater %REC and LMEAN compared to MID (P < 0.01) and NP sows (all P < 0.01). In conclusion, LATE sows exhibited indicators of greater autonomic stress throughout the heating period compared to MID and NP sows. However, temperature by treatment interactions were not detected as dry bulb increased. Future studies are needed to fully elucidate the effect of gestational stage and increasing dry bulb temperature on sow HRV.

中文翻译:

表征逐渐增加的干球温度对未妊娠、妊娠中期和妊娠晚期母猪心率变异性的线性和非线性测量的影响

表征母猪对增加的热负荷的生理反应对于有效缓解热应激至关重要。研究目的是描述 400 分钟的加热过程对不同繁殖阶段母猪心率变异性 (HRV) 的影响。HRV 是一种常用的自主神经功能的无创代理指标。根据选择时的妊娠阶段,27 头母猪被纳入研究:1) 未妊娠(NP;n = 7),2) 妊娠中期(MID;妊娠 57.3 ± 11.8 天;n = 11),以及3) 妊娠晚期(晚期;妊娠 98.8 ± 4.9 天;n = 8)。随着室内干球温度在 400 分钟内从 19.84 ± 2.15 °C 逐渐增加到 35.54 ± 0.43 °C(范围:17.1–37.5 °C),研究中使用的 HRV 数据是从每头猪身上收集的。数据收集后,在九个温度区间(19–20.99、21–22.99、23–24.99、25–26.99、27–28.99、29–30.99、31–32.99、33 –34.99 和 35–36.99 °C)。平均心搏间隔长度(RR),rr间隔的标准差(SDNN),连续差异的均方根(RMSSD),高频频谱功率(H​​F),样本熵(SampEn),短期去趋势波动分析( DFAα1),以及从重复量化分析中得出的三个测量值(%REC、DET、LMEAN)针对每个数据集进行了计算。使用 SAS 9.4 中的 PROC GLIMMIX 程序分析所有数据。总体而言,LATE 母猪的 RR 低于 NP 母猪 (P < 0.01)。r-r 区间和 RMSSD 的标准偏差在每组之间存在差异 (P < 0.01),LATE 母猪表现出最低的 SDNN 和 RMSSD,而 NP 母猪表现出最大的 SDNN 和 RMSSD。妊娠晚期母猪的 HF 值低于 MID 和 NP 母猪 (P < 0.0001),DFA 值高于 NP 母猪 (P = 0.05),DET 高于 MID 母猪 (P = 0.001)。与 MID (P < 0.01) 和 NP 母猪(所有 P < 0.01)相比,妊娠晚期母猪也表现出更高的 %REC 和 LMEAN。总之,与 MID 和 NP 母猪相比,LATE 母猪在整个供暖期表现出更大的自主神经应激指标。然而,当干球增加时,没有检测到治疗相互作用引起的温度。未来的研究需要充分阐明妊娠阶段和干球温度升高对母猪 HRV 的影响。妊娠晚期母猪的 HF 值低于 MID 和 NP 母猪 (P < 0.0001),DFA 值高于 NP 母猪 (P = 0.05),DET 高于 MID 母猪 (P = 0.001)。与 MID (P < 0.01) 和 NP 母猪(所有 P < 0.01)相比,妊娠晚期母猪也表现出更高的 %REC 和 LMEAN。总之,与 MID 和 NP 母猪相比,LATE 母猪在整个供暖期表现出更大的自主神经应激指标。然而,当干球增加时,没有检测到治疗相互作用引起的温度。未来的研究需要充分阐明妊娠阶段和干球温度升高对母猪 HRV 的影响。妊娠晚期母猪的 HF 值低于 MID 和 NP 母猪 (P < 0.0001),DFA 值高于 NP 母猪 (P = 0.05),DET 高于 MID 母猪 (P = 0.001)。与 MID (P < 0.01) 和 NP 母猪(所有 P < 0.01)相比,妊娠晚期母猪也表现出更高的 %REC 和 LMEAN。总之,与 MID 和 NP 母猪相比,LATE 母猪在整个供暖期表现出更大的自主神经应激指标。然而,当干球增加时,没有检测到治疗相互作用引起的温度。未来的研究需要充分阐明妊娠阶段和干球温度升高对母猪 HRV 的影响。与 MID (P < 0.01) 和 NP 母猪(所有 P < 0.01)相比,妊娠晚期母猪也表现出更高的 %REC 和 LMEAN。总之,与 MID 和 NP 母猪相比,LATE 母猪在整个供暖期表现出更大的自主神经应激指标。然而,当干球增加时,没有检测到治疗相互作用引起的温度。未来的研究需要充分阐明妊娠阶段和干球温度升高对母猪 HRV 的影响。与 MID (P < 0.01) 和 NP 母猪(所有 P < 0.01)相比,妊娠晚期母猪也表现出更高的 %REC 和 LMEAN。总之,与 MID 和 NP 母猪相比,LATE 母猪在整个供暖期表现出更大的自主神经应激指标。然而,当干球增加时,没有检测到治疗相互作用引起的温度。未来的研究需要充分阐明妊娠阶段和干球温度升高对母猪 HRV 的影响。
更新日期:2022-01-12
down
wechat
bug