Source:http://linkedlifedata.com/resource/pubmed/id/10875645
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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
6
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| pubmed:dateCreated |
2000-7-20
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| pubmed:abstractText |
The objective of this study was to determine whether digesta kinetics, energy intake (EI, kcal ME intake x kg(-.75) x d(-1)), grazing behavior, or body temperature differed by breed, lactational state, or season of the year among cattle presumed to vary in adaptability to the subtropics. Two-year-old lactating and nonlactating Brahman x Angus (BA; n = 5, n = 5), Tuli x Angus (TA; n = 5, n = 4), and Angus (A; n = 4, n = 4) cows were used. During both early (ES) and late summer (LS), lactating cattle vs nonlactating cattle had greater gastrointestinal tract load (CM2) and EI (P < .01), although passage rate did not differ (P > .48). During LS, lactating cattle had decreased early morning rectal temperatures (P < .05) and spent more time grazing during the day compared with nonlactating cattle (P < .001). Among breeds, A had the largest CM2 (P < .01 compared with BA and P = .068 compared with TA) and accumulated the greatest heat during the day (P < .05). Due to greater daytime shading (P < .01) and less daytime grazing (P < .05), A had lower (P < .05) early morning and comparable (P > .26) late afternoon rectal temperatures compared with BA and TA. With data pooled over both grazing trials, BA cattle had the smallest CM2 (P < .01), and in ES they spent the least amount of time in the shade (P < .001). The TA spent more time in the shade than did BA (P < .001) during ES and less during LS (P < .001) and had similar (P > .28) early morning rectal temperatures compared with BA during ES and LS. During LS, TA spent more time in the sun and less time in the shade than did either A or BA (P < .001). During ES, EI did not differ among breeds (P > .50). During LS, EI for lactating A was greater than for BA and TA (P < .05), and EI for nonlactating BA was less than for A and TA (P < .05). Bite rate per minute for lactating cattle during ES was reduced (P < .03) by increased body condition score. Tuli x Angus cattle appear to be comparable to BA with respect to heat adaptation. It appears that EI demands are greater in a hot environment.
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| pubmed:language |
eng
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| pubmed:journal | |
| pubmed:citationSubset |
IM
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| pubmed:status |
MEDLINE
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| pubmed:month |
Jun
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| pubmed:issn |
0021-8812
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| pubmed:author | |
| pubmed:issnType |
Print
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| pubmed:volume |
78
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| pubmed:owner |
NLM
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| pubmed:authorsComplete |
Y
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| pubmed:pagination |
1608-24
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| pubmed:dateRevised |
2008-11-21
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| pubmed:meshHeading |
pubmed-meshheading:10875645-Adaptation, Physiological,
pubmed-meshheading:10875645-Animals,
pubmed-meshheading:10875645-Body Temperature,
pubmed-meshheading:10875645-Cattle,
pubmed-meshheading:10875645-Digestion,
pubmed-meshheading:10875645-Energy Intake,
pubmed-meshheading:10875645-Feeding Behavior,
pubmed-meshheading:10875645-Female,
pubmed-meshheading:10875645-Hot Temperature,
pubmed-meshheading:10875645-Humidity,
pubmed-meshheading:10875645-Lactation,
pubmed-meshheading:10875645-Least-Squares Analysis,
pubmed-meshheading:10875645-Male,
pubmed-meshheading:10875645-Rectum,
pubmed-meshheading:10875645-Seasons
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| pubmed:year |
2000
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| pubmed:articleTitle |
Digesta kinetics, energy intake, grazing behavior, and body temperature of grazing beef cattle differing in adaptation to heat.
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| pubmed:affiliation |
Texas Agricultural Experiment Station, Uvalde 78801, USA. sprinkle@ag.arizona.edu
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| pubmed:publicationType |
Journal Article
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