食用受内生菌感染的高羊茅种子对与生长母牛摄入量调节和吸收后代谢相关的内分泌变化的影响

IF 1.9 2区 农林科学 Q2 AGRICULTURE, DAIRY & ANIMAL SCIENCE
Mindy E. King , Hannah M. Herzing , Kyle R. McLeod , James L. Klotz , Andrew P. Foote , J. Lannett Edwards , David L. Harmon
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引用次数: 0

摘要

高羊茅中毒症是一种因食用受内生菌感染的高羊茅而引起的综合症,会给肉牛业带来巨大的经济损失,主要是由于生长速度降低,同时干物质摄入量(DMI)减少;然而,DMI 减少的相关特征尚未阐明。本实验的目的是确定内生菌感染高羊茅种子(E+)后与摄入量调节有关的内分泌变化。按体重将 12 头荷斯坦阉牛分层,并将其分配到 3 个处理中的 1 个处理(n=4):0 ppm麦角新碱 (ERV)、1.8 ppm ERV 或 2.7 ppm ERV。处理方法是将不同比例的地面 E+ 和未受内生菌感染的高羊茅种子混合在一起。母牛适应日粮 7 天,然后是 7 天的 DMI 采集期。在同一处理中,母牛被分配到一个采样日(第 16 天或第 17 天)。从饲喂前 1 小时开始,每隔 20 分钟采集一次血样,持续 8 小时。采用 SAS 9.4(SAS Inst. 公司,北卡罗来纳州凯里)的 MIXED 程序分析摄入量数据,并将处理、日和交互作用作为固定效应。激素和代谢物数据采用处理、时间和交互作用的固定效应进行分析,其中时间作为重复测量和正交对比。随着日粮中ERV的增加,干物质摄入量呈线性下降(P < 0.001)。胰岛素和瘦素浓度呈现二次效应(P = 0.018 和 P = 0.005),胰岛素浓度在 2.7 ppm 处理中最高,瘦素浓度在 1.8 ppm 处理中最高。各处理组之间的活性胃泌素或β-羟基丁酸浓度没有差异。此外,与 0 ppm 处理相比,摄入 1.8 和 2.7 ppm ERV 处理的母牛催乳素浓度较低(二次方,P = 0.019)。随着ERV浓度的增加,葡萄糖浓度呈线性增加趋势(P = 0.091)。NEFA 浓度存在处理 × 时间的交互作用(P = 0.002),1.8 ppm ERV 处理显示饲喂前浓度增加,而 2.7 ppm ERV 处理显示随着饲喂后时间的延长,NEFA 浓度升高。结果表明,摄入 E+ 可能会通过改变摄入相关激素和吸收后代谢来减少摄入量,这有助于我们目前了解 E+ 对减少摄入量的影响,同时也为未来的研究提供了途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Impact of endophyte-infected tall fescue seed consumption on endocrine changes associated with intake regulation and post-absorptive metabolism in growing steers

Fescue toxicosis is a syndrome occurring from the consumption of endophyte-infected tall fescue and results in substantial economic losses to the beef industry primarily from reduced growth accompanied by decreased dry matter intake (DMI); however, the associations characterizing this reduction in DMI have yet to be elucidated. The objective of this experiment was to identify endocrine changes associated with intake regulation post-consumption of endophyte-infected tall fescue seed (E+). Twelve Holstein steers were stratified by body weight and assigned to 1 of 3 treatments (n=4): 0 ppm ergovaline (ERV), 1.8 ppm ERV, or 2.7 ppm ERV. Treatments were achieved by combining differing proportions of ground E+ and non-endophyte-infected tall fescue seed. Steers were adapted to their diets for 7 d followed by a 7 d DMI collection period. Within treatment, steers were assigned to a sampling day (d 16 or d 17). Blood samples were collected every 20 min for 8 h, beginning 1 h before feeding. Intake data was analyzed using the MIXED procedure of SAS 9.4 (SAS Inst. Inc., Cary, NC) with treatment, day, and the interaction as fixed effects. Hormone and metabolite data were analyzed with the fixed effect of treatment, time, and the interaction including time as a repeated measure and orthogonal contrasts. Dry matter intake was linearly decreased with increasing ERV in the diet (P < 0.001). Insulin and leptin concentrations exhibited a quadratic effect (P = 0.018 and P = 0.005) with insulin concentrations highest for the 2.7 ppm treatment and leptin concentrations highest for the 1.8 ppm treatment. No differences were detected for active ghrelin or β-hydroxybuytrate concentrations among treatment groups. Further, steers consuming both the 1.8 and 2.7 ppm ERV treatments had lower prolactin concentrations compared to the 0 ppm treatment (quadratic, P = 0.019). Glucose concentrations had a tendency for a linear increase as ERV concentrations increased (P = 0.091). A treatment × time interaction (P = 0.002) was noted in NEFA concentrations, with the 1.8 ppm ERV treatment showing increased pre-feeding concentrations, and the 2.7 ppm ERV treatment exhibiting elevated NEFA concentrations as time post-feeding progressed. The results suggest that E+ consumption reduces intake likely through alterations in intake-related hormones and post-absorptive metabolism and contributes to our current understanding of E+ effects on intake reduction while providing avenues for future research.

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来源期刊
Domestic animal endocrinology
Domestic animal endocrinology 农林科学-奶制品与动物科学
CiteScore
5.50
自引率
4.80%
发文量
58
审稿时长
31 days
期刊介绍: Domestic Animal Endocrinology publishes scientific papers dealing with the study of the endocrine physiology of domestic animal species. Those manuscripts utilizing other species as models for clinical or production problems associated with domestic animals are also welcome. Topics covered include: Classical and reproductive endocrinology- Clinical and applied endocrinology- Regulation of hormone secretion- Hormone action- Molecular biology- Cytokines- Growth factors
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