| Effects of misty-fan cooling and supplemental rbST on rumen function and milk production of crossbred Holstein cattle during early, mid and late lactation in a tropical environment. | |
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MedLine Citation:
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PMID: 20438505 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Two groups of five crossbred 87.5% Holstein cattle were housed in normal shade only (NS) as non-cooled cows and in shaded housing with misty-fan cooling (MF) as cooled cows. The cows were treated with recombinant bovine somatotropin (rbST) in early, mid and late lactation with three consecutive injections of rbST in every 14 days. Ambient temperatures and the temperature humidity index in the NS barn were significantly higher than those of the MF barn, whereas relative humidity in MF was higher than that of NS barn. The DMI of cooled cows were higher than those of non-cooled cows, and cooled cows exhibited more response to rbST treatment. Exogenous rbST significantly increased milk yield throughout lactation. The rbST-treated cows had higher total ruminal fermentation products as volatile fatty acid and ammonia nitrogen than the non-rbST treated cows and associated changes were greater in cooled animals in all stages of lactation. Exogenous rbST increased the concentrations of milk urea nitrogen in both groups. These results suggest that the changes in ruminal fermentation with greater production of total VFA and NH(3)N in response to rbST in crossbred cows whether under misty-fan cooling or not, is in part through an increase in feed intake, thereby making more substrate available to the mammary gland for milk synthesis. |
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Authors:
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Wilaiporn Chanchai; Somchai Chanpongsang; Narongsak Chaiyabutr |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Animal science journal = Nihon chikusan Gakkaih? Volume: 81 ISSN: 1740-0929 ISO Abbreviation: Anim. Sci. J. Publication Date: 2010 Apr |
Date Detail:
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Created Date: 2010-05-04 Completed Date: 2010-06-03 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100956805 Medline TA: Anim Sci J Country: Australia |
Other Details:
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Languages: eng Pagination: 230-9 Citation Subset: IM |
Affiliation:
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Departments of Physiology, Faculty of Veterinary Science, Chulalongkorn University, Bangkok, Thailand. C_wilaiporn@hotmail.com |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Cattle / physiology* Crosses, Genetic Female Growth Hormone / administration & dosage* Humidity Lactation / drug effects*, physiology* Recombinant Proteins / administration & dosage Respiratory Rate Rumen / physiology* Temperature |
| Chemical | |
Reg. No./Substance:
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0/Recombinant Proteins; 9002-72-6/Growth Hormone |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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