Document Detail

Short communication: effect of postgrazing residual pasture height on milk production.
MedLine Citation:
PMID:  18946136     Owner:  NLM     Status:  MEDLINE    
In grazing systems, dry matter intake (DMI) and milk production have been reported to increase with increasing pasture allowance (PA). This has often led to greater postgrazing residual heights being associated with a well-fed cow. However, in previous studies pastures were often managed to be homogeneous pretreatment, confounding the effect of postgrazing height and PA because high PA led to high postgrazing height. The objective of this study was to determine whether postgrazing height affects milk production if cows are offered the same PA. Before the study, perennial ryegrass (Lolium perenne L.) dominant pastures were randomly allocated to 1 of 3 grazing treatments and defoliated to 4.1 +/- 0.3 (low), 5.1 +/- 0.3 (medium), or 5.9 +/- 0.3 (high) cm compressed postgrazing residual pasture height. When a minimum of 2 new leaves had emerged on the majority of ryegrass tillers, 30 multiparous dairy cows were randomly assigned to 1 of the 3 treatments and grazed their respective pastures over a 10-d period. Cows were offered a similar PA above the preexperimental postgrazing residual (17.1 +/- 2.9 kg of dry matter/cow per d). Pasture disappearance per daily grazing area (estimated DMI) was similar across treatments (14.8 kg of dry matter/cow per d). Milk yield was negatively correlated with postgrazing height, but postgrazing height had no effect on milk component yield. Although the reason for this reduction in milk yield remains unclear, data indicate that low postgrazing heights do not adversely affect milk production.
J M Lee; D J Donaghy; J R Roche
Related Documents :
18595956 - Age at first introduction of cow milk products and other food products in relation to i...
10629806 - A comparative study of reproductive performance in organic and conventional dairy husba...
17582116 - Concentrations of 17beta-estradiol in holstein whole milk.
24925846 - Responses to a novel food acquisition task in three species of lemurs.
5695066 - Production of enterotoxin a in milk.
25342946 - An acute trophic cascade among microorganisms in the tree hole ecosystem following remo...
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of dairy science     Volume:  91     ISSN:  1525-3198     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  2008 Nov 
Date Detail:
Created Date:  2008-10-23     Completed Date:  2009-01-07     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2985126R     Medline TA:  J Dairy Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  4307-11     Citation Subset:  IM    
DairyNZ Ltd., Private Bag 3221, Hamilton 3240, New Zealand.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Animal Feed
Cattle / physiology*
Dairying / methods*
Feeding Methods / veterinary*
Lolium / metabolism*
Milk / chemistry,  secretion*
Random Allocation

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

Previous Document:  Short communication: effect of changing the ratio of forage to concentrate on ammonia emissions by d...
Next Document:  Fine mapping of quantitative trait Loci on bovine chromosome 6 affecting calving difficulty.