Document Detail

Timing of supplementation alters grazing behavior and milk production response in dairy cows.
MedLine Citation:
PMID:  23102952     Owner:  NLM     Status:  MEDLINE    
Offering feed supplements to grazing dairy cows results in substitution of pasture; however, previous data indicate that the time at which concentrate supplements are offered might affect the level of substitution. These data indicated that cows grazed more intensely presunset, regardless of the amount of supplement offered. It was, therefore, hypothesized that substitution rate would be less, and response to supplement greater if cows received their supplement at the p.m. rather than the a.m. milking. Forty-eight multiparous, nonpregnant, Holstein-Friesian cows, approximately 60 d in milk, were randomly allocated to 1 of 3 treatments in an incomplete crossover arrangement. Treatments were pasture only, pasture + 3 kg of concentrate supplement dry matter (DM) offered during the a.m. milking (AM-SUP), and pasture + 3 kg of concentrate supplement DM offered during the p.m. milking (PM-SUP). Time spent grazing and calculated pasture DM intake did not differ between the AM-SUP and PM-SUP cows. However, a tendency (0.18 kg of milk/kg of concentrate DM) was observed for an increased marginal milk response (kg of milk/kg of DM supplement) for the AM-SUP cows when compared with PM-SUP cows. Irrespective of when supplements were offered, supplementation reduced total grazing time by a similar amount, and the reduction in time spent grazing was evident throughout the day. Cows in the PM-SUP group ruminated for longer and cows in the AM-SUP group spent more time idle compared with the pasture only groups. Cows in the AM-SUP group grazed for less time during the major a.m. grazing bout following a.m. milking compared with PM-SUP cows; in comparison, the major p.m. grazing bout following p.m. milking was unaffected by supplementation. The results indicated possible improvements in marginal milk response to supplements from altering the timing of delivery.
A J Sheahan; S J Gibbs; J R Roche
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-10-24
Journal Detail:
Title:  Journal of dairy science     Volume:  96     ISSN:  1525-3198     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2012-12-25     Completed Date:  2013-06-05     Revised Date:  2013-06-28    
Medline Journal Info:
Nlm Unique ID:  2985126R     Medline TA:  J Dairy Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  477-83     Citation Subset:  IM    
Copyright Information:
Copyright © 2013 American Dairy Science Association. Published by Elsevier Inc. All rights reserved.
DairyNZ, Private Bag 3221, 3240 Hamilton, New Zealand.
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MeSH Terms
Animal Feed
Diet / veterinary*
Dietary Supplements*
Eating / drug effects,  physiology
Feeding Behavior / drug effects*,  physiology
Lactation / drug effects*,  physiology
Time Factors
Erratum In:
J Dairy Sci. 2013 Mar;96(3):1924

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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