92 Effects of an acclimation protocol during the handling events of the 7-day CO-Synch + CIDR protocol on temperament and reproductive performance of Bos taurus beef heifers

IF 2.9 2区农林科学 Q1 AGRICULTURE, DAIRY & ANIMAL SCIENCE

Journal of animal science Pub Date : 2025-06-27 DOI:10.1093/jas/skaf170.068

Sydney H Flax, Danielle M Stock, Allen G Schwartz, Jack Lemmon, Joao V C Silva, Santiago P Hurtado, Andreia F Machado, Victor Gomez-Leon, John R Jaeger, Nicola Oosthuizen, K C Olson, Felipe A C C Silva, Sandy Johnson, Nicholas Wege Dias

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Abstract

It has been previously demonstrated that heifers with excitable temperament have greater cortisol concentrations and decreased conception rates to timed-artificial insemination (TAI). Nevertheless, cortisol concentrations are decreased as the handling events of an estrus synchronization protocol (ES) progress. The objectives of this study were to investigate the effects of acclimating heifers to the facility during the handling events of an ES protocol on temperament and conception rates to TAI. Prior to enrollment in the study (Day -10), 622 Bos taurus commercial beef heifers from five locations in the Spring of 2023 and three locations in the Spring of 2024 were evaluated for reproductive tract scores (RTS), chute score (CS), and exit velocity (EV). To determine RTS, the following scale was used based on uterine horn diameter and uterine tone: 1=immature, < 20mm diameter and no tone; 2=20-25mm diameter and no tone; 3=20-25mm diameter with slight tone; 4=30mm diameter with good tone; 5= >30mm diameter with good tone. Chute scores were recorded on a scale where 1=calm and motionless; 2=restless movements; 3=frequent movement and vocalization; 4=constant movement, vocalization, shaking, and struggling; 5=violent and continuous struggling. Exit velocity was measured using an infrared sensor. Heifers were stratified based on CS and RTS to be acclimated to the handling facility during the handling events of the ES (TRT; n=307) or serve as control (CTRL; n=315), tagged accordingly and managed as one group. All heifers were enrolled in the 7-day CO-Synch + CIDR protocol and received TAI. Before the ES protocol handling events (Days 0, 7, and 10), TRT heifers were sorted off and acclimated to the handling facility by running them through the chute without restraint. After acclimation, they were commingled with CTRL heifers and returned to the facility for the subsequent ES event. To assess temperament, CS and EV were collected for all heifers on Days 0, 7, and 10 of the study. Estrus detection patches were placed on Day 7 and scored on Day 10. Pregnancy status was determined approximately 40 days post-TAI by transrectal ultrasonography. No treatment effects were observed for RTS (P=0.78), CS (P=0.42) and EV (P=0.17) on Day -10. Exit velocities decreased as the protocol progressed for all heifers (P< 0.0001), but did not differ between treatments (P=0.27). Additionally, no difference was observed for estrus patch scores (P=0.46) between treatments. However, TRT heifers had decreased CS on Day 10 when compared to CTRL (P=0.001) and greater conception rates to TAI (54% for TRT and 45% for CTRL; P=0.02). These results suggest that acclimating heifers to the facility during the handling events of the 7-day CO-Synch + CIDR estrus synchronization protocol led to improved chute scores, indicating a potential improvement in temperament, and effectively improved conception rates to TAI.

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7 d co - sync + CIDR处理过程中驯化方案对牛牛肉牛性情和繁殖性能的影响

先前已经证明，具有兴奋性气质的小母牛皮质醇浓度较高，并且对定时人工授精（TAI）的受孕率降低。然而，皮质醇浓度随着处理事件的发情同步协议（ES）的进展而降低。本研究的目的是调查在ES方案处理过程中使小母牛适应该设施对TAI的气质和受孕率的影响。在研究入组之前（第10天），研究人员对2023年春季和2024年春季分别来自5个地点和3个地点的622头牛商业肉牛进行了生殖道评分（RTS）、滑槽评分（CS）和出口速度（EV）的评估。为确定RTS，根据子宫角直径和子宫张力采用以下量表：1=未成熟，<；20mm直径，无色调；2=直径20-25mm且无色调；3=直径20-25mm，色调轻微；4=直径30mm色调好；5= >；30mm直径，色调好。滑道得分记录在1=平静和静止；2 =不安分的动作;3=频繁的动作和发声；4=不断移动、发声、颤抖和挣扎；5=暴力和持续的挣扎。用红外传感器测量出口速度。在ES （TRT）处理过程中，根据CS和RTS对小母牛进行分层，使其适应处理设施；n=307)或作为对照(CTRL；N =315)，进行相应标记，作为一组管理。所有母牛均采用7 d co - sync + CIDR方案，并接受TAI治疗。在ES协议处理事件（第0、7和10天）之前，TRT小母牛被分类并通过不受约束地通过滑槽来适应处理设施。驯化后，它们与CTRL小母牛混合，并返回设施进行随后的ES活动。为了评估气质，在研究的第0、7和10天收集所有母牛的CS和EV。第7天放置发情检测贴片，第10天评分。经直肠超声检查在tai后约40天确定妊娠状况。在第-10天，RTS （P=0.78）、CS （P=0.42）和EV （P=0.17）未见治疗效果。所有小母牛的出口速度随着方案的进展而下降(P<；0.0001)，但治疗间无差异（P=0.27）。此外，两组之间的发情斑块评分无差异（P=0.46）。然而，与CTRL相比，TRT母牛在第10天的CS降低（P=0.001），并且对TAI的受孕率更高(TRT为54%，CTRL为45%；P = 0.02)。这些结果表明，在7天CO-Synch + CIDR发情同步方案处理事件期间，犊牛适应该设施可以提高滑道评分，表明气质可能得到改善，并有效提高对TAI的受孕率。

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来源期刊

Journal of animal science 农林科学-奶制品与动物科学

CiteScore

4.80

自引率

12.10%

发文量

1589

审稿时长

3 months

期刊介绍： The Journal of Animal Science (JAS) is the premier journal for animal science and serves as the leading source of new knowledge and perspective in this area. JAS publishes more than 500 fully reviewed research articles, invited reviews, technical notes, and letters to the editor each year. Articles published in JAS encompass a broad range of research topics in animal production and fundamental aspects of genetics, nutrition, physiology, and preparation and utilization of animal products. Articles typically report research with beef cattle, companion animals, goats, horses, pigs, and sheep; however, studies involving other farm animals, aquatic and wildlife species, and laboratory animal species that address fundamental questions related to livestock and companion animal biology will be considered for publication.