PS8-14. Evaluation of an Automated Head Chamber System for Measuring Gas Flux in Confined Steers.

IF 3.7 2区农林科学 Q1 AGRICULTURE, DAIRY & ANIMAL SCIENCE

Journal of animal science Pub Date : 2026-09-29 DOI:10.1093/jas/skag272.563

Leonardo Gomes Sitorski, Irene Reis, Eduardo M Paula, Juan J Vargas, Sara E Place

{"title":"PS8-14. Evaluation of an Automated Head Chamber System for Measuring Gas Flux in Confined Steers.","authors":"Leonardo Gomes Sitorski, Irene Reis, Eduardo M Paula, Juan J Vargas, Sara E Place","doi":"10.1093/jas/skag272.563","DOIUrl":null,"url":null,"abstract":"In recent years, the use of the automated head chamber system (AHCS) has become recurrent when evaluating gas flux in ruminants. However, there is limited information regarding the determination of gas flux among AHCS units, when cattle are not exposed to all units simultaneously. The objective of this experiment was to define the effect of AHCS units on the gas flux determination of steers under confined conditions. A total of six mature Angus steers (1056 ± 72 kg of initial body weight) were used to validate the gas flux during three 14-day periods. Steers were located in a different pen during each period. Each pen contained five intake monitoring system units (SmartFeed, C-Lock, Rapid City, SD) and one AHCS (GreenFeed, C-Lock, Rapid City, SD) unit. Steers were fed ad libitum a high-forage diet of corn silage, wheat straw, dry distillers' grains, and minerals and vitamins (45, 40, 10, and 5% on a dry matter basis, respectively). Steers were allowed to visit the AHCS unit every 2 hours (up to 12 visits per day) and consume up to 6 drops of alfalfa pellet (approximately 35 g/drop) with 30-second spacing between drops. Individual intake and gas flux were analyzed with a complete randomized design with repeated measures using the MIXED Procedure of SAS (SAS Institute Inc., Cary, NC). The model included the fixed effect of the AHCS unit and the random effect of the steer. Significance was determined at P ≤ 0.05. Individual dry matter intake was not different (P = 0.18) among AHCS units, averaging 14.7 ± 0.7 kg/d. The production of carbon dioxide (CO2) and methane (CH4) was not different (P = 0.30 and 0.48, respectively) among AHCS units. Also, the consumption of oxygen (O2) did not differ (P = 0.11) among AHCS units. The AHCS units explained 10, 17, and 28% of the variation of CH4, CO2, and O2, respectively. Gas flux determination was not different among AHCS units, suggesting consistency in gas flux determination. In this experiment, AHCS and the evaluation period are confounded by design to evaluate animals not simultaneously exposed to the same AHCS units. Thus, further work is required to evaluate animals simultaneously exposed to different AHCS units.","PeriodicalId":14895,"journal":{"name":"Journal of animal science","volume":"151 1","pages":""},"PeriodicalIF":3.7000,"publicationDate":"2026-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of animal science","FirstCategoryId":"97","ListUrlMain":"https://doi.org/10.1093/jas/skag272.563","RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"AGRICULTURE, DAIRY & ANIMAL SCIENCE","Score":null,"Total":0}

引用次数: 0

Abstract

In recent years, the use of the automated head chamber system (AHCS) has become recurrent when evaluating gas flux in ruminants. However, there is limited information regarding the determination of gas flux among AHCS units, when cattle are not exposed to all units simultaneously. The objective of this experiment was to define the effect of AHCS units on the gas flux determination of steers under confined conditions. A total of six mature Angus steers (1056 ± 72 kg of initial body weight) were used to validate the gas flux during three 14-day periods. Steers were located in a different pen during each period. Each pen contained five intake monitoring system units (SmartFeed, C-Lock, Rapid City, SD) and one AHCS (GreenFeed, C-Lock, Rapid City, SD) unit. Steers were fed ad libitum a high-forage diet of corn silage, wheat straw, dry distillers' grains, and minerals and vitamins (45, 40, 10, and 5% on a dry matter basis, respectively). Steers were allowed to visit the AHCS unit every 2 hours (up to 12 visits per day) and consume up to 6 drops of alfalfa pellet (approximately 35 g/drop) with 30-second spacing between drops. Individual intake and gas flux were analyzed with a complete randomized design with repeated measures using the MIXED Procedure of SAS (SAS Institute Inc., Cary, NC). The model included the fixed effect of the AHCS unit and the random effect of the steer. Significance was determined at P ≤ 0.05. Individual dry matter intake was not different (P = 0.18) among AHCS units, averaging 14.7 ± 0.7 kg/d. The production of carbon dioxide (CO2) and methane (CH4) was not different (P = 0.30 and 0.48, respectively) among AHCS units. Also, the consumption of oxygen (O2) did not differ (P = 0.11) among AHCS units. The AHCS units explained 10, 17, and 28% of the variation of CH4, CO2, and O2, respectively. Gas flux determination was not different among AHCS units, suggesting consistency in gas flux determination. In this experiment, AHCS and the evaluation period are confounded by design to evaluate animals not simultaneously exposed to the same AHCS units. Thus, further work is required to evaluate animals simultaneously exposed to different AHCS units.

查看原文本刊更多论文

PS8-14。密闭转向器中气体通量测量的自动头室系统的评价。

近年来，在评估反刍动物的气体通量时，使用自动头室系统（AHCS）已经成为经常使用的方法。然而，当牛没有同时暴露于所有单元时，关于AHCS单元之间气体通量的测定信息有限。本实验的目的是确定AHCS单元在受限条件下对舵机气体通量测定的影响。在3个为期14天的试验期间，共选用6头成熟安格斯阉牛（初始体重为1056±72 kg）验证气体通量。在每个阶段，牛被安置在不同的围栏中。每支笔包含五个进气监测系统单元（SmartFeed, C-Lock, Rapid City， SD）和一个AHCS （GreenFeed, C-Lock, Rapid City， SD）单元。饲喂玉米青贮、小麦秸秆、干酒糟、矿物质和维生素（干物质含量分别为45%、40%、10%和5%）的高饲粮。指导犬被允许每2小时访问AHCS单元（每天最多访问12次），并消耗最多6滴苜蓿颗粒（约35克/滴），滴药间隔30秒。采用SAS （SAS Institute Inc., Cary， NC）的混合程序，采用完全随机设计和重复测量来分析个体进气和气体通量。该模型考虑了AHCS单元的固定效应和舵机的随机效应。P≤0.05为显著性。各单位干物质采食量无显著差异（P = 0.18），平均为14.7±0.7 kg/d。不同AHCS单元间二氧化碳（CO2）和甲烷（CH4）的产量无显著差异（P值分别为0.30和0.48）。此外，各AHCS单位的耗氧量（O2）也没有差异（P = 0.11）。AHCS单位分别解释了CH4、CO2和O2变化的10%、17%和28%。各AHCS单位的气通量测定结果无差异，说明气通量测定结果具有一致性。本实验设计将AHCS与评价期混淆，对未同时暴露于同一AHCS单元的动物进行评价。因此，需要进一步的工作来评估同时暴露于不同AHCS单位的动物。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

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.