| Effect of saturated fatty acid supplementation on production and metabolism indices in heat-stressed mid-lactation dairy cows. | |
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MedLine Citation:
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PMID: 20723687 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Experimental objectives were to determine the effects of supplemental saturated fatty acids on production, body temperature indices, and some aspects of metabolism in mid-lactation dairy cows experiencing heat stress. Forty-eight heat-stressed Holstein cows were allocated into 3 groups (n=16/group) according to a completely randomized block design. Three treatment diets consisted of supplemental saturated fatty acids (SFA) at 0 (SFA0), 1.5 (SFA1.5), or 3.0% (SFA3) of dry matter (DM) for 10 wk. Diets were isonitrogenous (crude protein=16.8%) and contained 1.42, 1.46, and 1.49 Mcal of net energy for lactation/kg of DM for the SFA0, SFA1.5 and SFA3 diets, respectively. The average temperature-humidity index at 0700, 1400 and 2200 h was 72.2, 84.3, and 76.6, respectively. Rectal temperatures at 1400 h were decreased with fat supplementation. Treatment did not affect dry matter intake (20.1+/-0.02 kg/d), body condition score (2.72+/-0.04), body weight (627+/-16.1 kg), or calculated energy balance (1.32+/-0.83 Mcal/d). Saturated fatty acid supplementation increased milk yield, milk fat content, and total milk solids. Increasing fat supplementation decreased plasma nonesterified fatty acids (8%) but had no effect on other energetic metabolites or hormones. In summary, supplemental SFA improved milk yield and milk fat content and yield and reduced peak rectal temperatures in mid-lactation heat-stressed dairy cows. This demonstrates the remarkable amount of metabolic heat that is "saved" by energetically replacing fermentable carbohydrates with supplemental SFA. |
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Authors:
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J P Wang; D P Bu; J Q Wang; X K Huo; T J Guo; H Y Wei; L Y Zhou; R R Rastani; L H Baumgard; F D Li |
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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: Journal of dairy science Volume: 93 ISSN: 1525-3198 ISO Abbreviation: J. Dairy Sci. Publication Date: 2010 Sep |
Date Detail:
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Created Date: 2010-08-20 Completed Date: 2010-11-30 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 2985126R Medline TA: J Dairy Sci Country: United States |
Other Details:
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Languages: eng Pagination: 4121-7 Citation Subset: IM |
Copyright Information:
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Copyright (c) 2010 American Dairy Science Association. Published by Elsevier Inc. All rights reserved. |
Affiliation:
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State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy Agricultural Sciences, Beijing 100393, PR China. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Body Temperature / drug effects, physiology Body Weight / drug effects, physiology Cattle / metabolism, physiology* Dietary Supplements* Eating / drug effects, physiology Energy Metabolism / drug effects, physiology Fatty Acids / pharmacology* Fatty Acids, Nonesterified / blood Female Heat-Shock Response / drug effects, physiology Lactation / drug effects, physiology Milk / chemistry, drug effects, secretion* |
| Chemical | |
Reg. No./Substance:
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0/Fatty Acids; 0/Fatty Acids, Nonesterified |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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