Sierra L. Pillmore , Tylo J. Kirkpatrick , Kaitlyn R. Wesley , Kimberly B. Cooper , Forest L. Francis , Travis C. Tennant , Wade T. Nichols , John P. Hutcheson , Ty E. Lawrence
{"title":"在为期 361 天的饲养过程中，植入夏洛莱 × 安格斯饲料的小公牛与未植入饲料的小公牛在摄入 3 种粗饲料水平时的活动量和反刍量比较","authors":"Sierra L. Pillmore , Tylo J. Kirkpatrick , Kaitlyn R. Wesley , Kimberly B. Cooper , Forest L. Francis , Travis C. Tennant , Wade T. Nichols , John P. Hutcheson , Ty E. Lawrence","doi":"10.15232/aas.2023-02517","DOIUrl":null,"url":null,"abstract":"<div><h3>Objective</h3><p>Rumination and activity of growing feedlot steers were evaluated in response to growth-promoting implant administration, feeding duration, and dietary rough- age.</p></div><div><h3>Materials and Methods</h3><p>Charolais × Angus steers (n = 80) were randomized to harvest (1, 42, 84, 126, 168, 210, 252, 294, 336, or 378 d on feed) and implant treatment (REV: Revalor-XS on d 0 and d 190; CON: no implant). Activity and rumination were objectively monitored via accelerometers attached to the left ear. Steers consumed 3 rations throughout the study: starter (38.5% roughage), intermediate (23% roughage), and finishing (8.5% rough- age). Data were logged in 2-h increments from 77 steers across 361 d and analyzed using mixed models.</p></div><div><h3>Results and Discussion</h3><p>Rumination and activity varied within 24-h, exhibiting bimodal patterns; rumination peaked at 0600 and 1400 h and troughed at 1000 and 1800 h. Activity peaked at 0800 and 1800 h and troughed at 0400, 1200 to 1400, and 2200 h. Steers administered REV ruminated less (331 vs. 354 min/d) than CON; however, activity was similar between treatments. Treatment × roughage interactions occurred for rumination and activity. Rumination tended to be greater for CON steers consuming 38.5% than CON steers consuming 23% roughage, furthermore, CON steers ruminated more than REV when consuming 8.5% roughage. Implanted and non-implanted steers ruminated less as roughage inclusion decreased from 38.5% and 23% to 8.5% (457 and 439 vs. 317 min/d, respectively) in the finishing ration. Activity was greatest for steers consuming 38.5% roughage and was similar between treatments; however, activity decreased upon transition to 23% and 8.5% roughage. Observed surges and declines in activity can be attributed to processing days and weather events. Implanted steers consuming 8.5% roughage were more active (342 vs. 337 and 333 min/d) than CON and REV steers consuming 23% roughage.</p></div><div><h3>Implications and Applications</h3><p>In conclusion, rumination and activity are responsive to hour of day, dietary roughage and growth-promoting implants.</p></div>","PeriodicalId":8519,"journal":{"name":"Applied Animal Science","volume":null,"pages":null},"PeriodicalIF":1.4000,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590286524000302/pdf?md5=b8d3c812f141091d4075ff2bae8ee149&pid=1-s2.0-S2590286524000302-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Activity and rumination of implanted Charolais × Angus feedlot steers versus non-implanted counterparts consuming 3 levels of roughage throughout a 361-day feeding duration\",\"authors\":\"Sierra L. Pillmore , Tylo J. Kirkpatrick , Kaitlyn R. Wesley , Kimberly B. Cooper , Forest L. Francis , Travis C. Tennant , Wade T. Nichols , John P. Hutcheson , Ty E. Lawrence\",\"doi\":\"10.15232/aas.2023-02517\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><h3>Objective</h3><p>Rumination and activity of growing feedlot steers were evaluated in response to growth-promoting implant administration, feeding duration, and dietary rough- age.</p></div><div><h3>Materials and Methods</h3><p>Charolais × Angus steers (n = 80) were randomized to harvest (1, 42, 84, 126, 168, 210, 252, 294, 336, or 378 d on feed) and implant treatment (REV: Revalor-XS on d 0 and d 190; CON: no implant). Activity and rumination were objectively monitored via accelerometers attached to the left ear. Steers consumed 3 rations throughout the study: starter (38.5% roughage), intermediate (23% roughage), and finishing (8.5% rough- age). Data were logged in 2-h increments from 77 steers across 361 d and analyzed using mixed models.</p></div><div><h3>Results and Discussion</h3><p>Rumination and activity varied within 24-h, exhibiting bimodal patterns; rumination peaked at 0600 and 1400 h and troughed at 1000 and 1800 h. Activity peaked at 0800 and 1800 h and troughed at 0400, 1200 to 1400, and 2200 h. Steers administered REV ruminated less (331 vs. 354 min/d) than CON; however, activity was similar between treatments. Treatment × roughage interactions occurred for rumination and activity. Rumination tended to be greater for CON steers consuming 38.5% than CON steers consuming 23% roughage, furthermore, CON steers ruminated more than REV when consuming 8.5% roughage. Implanted and non-implanted steers ruminated less as roughage inclusion decreased from 38.5% and 23% to 8.5% (457 and 439 vs. 317 min/d, respectively) in the finishing ration. Activity was greatest for steers consuming 38.5% roughage and was similar between treatments; however, activity decreased upon transition to 23% and 8.5% roughage. Observed surges and declines in activity can be attributed to processing days and weather events. Implanted steers consuming 8.5% roughage were more active (342 vs. 337 and 333 min/d) than CON and REV steers consuming 23% roughage.</p></div><div><h3>Implications and Applications</h3><p>In conclusion, rumination and activity are responsive to hour of day, dietary roughage and growth-promoting implants.</p></div>\",\"PeriodicalId\":8519,\"journal\":{\"name\":\"Applied Animal Science\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.4000,\"publicationDate\":\"2024-03-27\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.sciencedirect.com/science/article/pii/S2590286524000302/pdf?md5=b8d3c812f141091d4075ff2bae8ee149&pid=1-s2.0-S2590286524000302-main.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Applied Animal Science\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S2590286524000302\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"AGRICULTURE, DAIRY & ANIMAL SCIENCE\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Animal Science","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2590286524000302","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"AGRICULTURE, DAIRY & ANIMAL SCIENCE","Score":null,"Total":0}
Activity and rumination of implanted Charolais × Angus feedlot steers versus non-implanted counterparts consuming 3 levels of roughage throughout a 361-day feeding duration
Objective
Rumination and activity of growing feedlot steers were evaluated in response to growth-promoting implant administration, feeding duration, and dietary rough- age.
Materials and Methods
Charolais × Angus steers (n = 80) were randomized to harvest (1, 42, 84, 126, 168, 210, 252, 294, 336, or 378 d on feed) and implant treatment (REV: Revalor-XS on d 0 and d 190; CON: no implant). Activity and rumination were objectively monitored via accelerometers attached to the left ear. Steers consumed 3 rations throughout the study: starter (38.5% roughage), intermediate (23% roughage), and finishing (8.5% rough- age). Data were logged in 2-h increments from 77 steers across 361 d and analyzed using mixed models.
Results and Discussion
Rumination and activity varied within 24-h, exhibiting bimodal patterns; rumination peaked at 0600 and 1400 h and troughed at 1000 and 1800 h. Activity peaked at 0800 and 1800 h and troughed at 0400, 1200 to 1400, and 2200 h. Steers administered REV ruminated less (331 vs. 354 min/d) than CON; however, activity was similar between treatments. Treatment × roughage interactions occurred for rumination and activity. Rumination tended to be greater for CON steers consuming 38.5% than CON steers consuming 23% roughage, furthermore, CON steers ruminated more than REV when consuming 8.5% roughage. Implanted and non-implanted steers ruminated less as roughage inclusion decreased from 38.5% and 23% to 8.5% (457 and 439 vs. 317 min/d, respectively) in the finishing ration. Activity was greatest for steers consuming 38.5% roughage and was similar between treatments; however, activity decreased upon transition to 23% and 8.5% roughage. Observed surges and declines in activity can be attributed to processing days and weather events. Implanted steers consuming 8.5% roughage were more active (342 vs. 337 and 333 min/d) than CON and REV steers consuming 23% roughage.
Implications and Applications
In conclusion, rumination and activity are responsive to hour of day, dietary roughage and growth-promoting implants.
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