| Dry matter intake and feed efficiency profiles of 3 genotypes of Holstein-Friesian within pasture-based systems of milk production. | |
| | |
MedLine Citation:
|
PMID: 20723705 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
The primary objective of the study was to quantify the effect of genetic improvement using the Irish total merit index (Economic Breeding Index) on dry matter intake and feed efficiency across lactation and to quantify the variation in performance among alternative definitions of feed efficiency. Three genotypes of Holstein-Friesian dairy cattle were established from within the Moorepark dairy research herd: 1) low Economic Breeding Index North American Holstein-Friesian representative of the Irish national average dairy cow, 2) high genetic merit North American Holstein-Friesian, and 3) high genetic merit New Zealand Holstein-Friesian. Animals from within each genotype were randomly allocated to 1 of 2 possible intensive pasture-based feed systems: 1) the Moorepark pasture system (2.64 cows/ha and 500 kg of concentrate supplement per cow per lactation) and 2) a high output per hectare pasture system (2.85 cows/ha and 1,200 kg of concentrate supplement per cow per lactation). A total of 128 and 140 spring-calving dairy cows were used during the years 2007 and 2008, respectively. Each group had an individual farmlet of 17 paddocks, and all groups were managed similarly throughout the study. The effects of genotype, feed system, and the interaction between genotype and feed system on dry matter intake, milk production, body weight, body condition score, and different definitions of feed efficiency were studied using mixed models with factorial arrangements of genotypes and feed systems accounting for the repeated cow records across years. No significant genotype-by-feed-system interactions were observed for any of the variables measured. Results showed that aggressive selection using the Irish Economic Breeding Index had no effect on dry matter intake across lactation when managed on intensive pasture-based systems of milk production, although the ranking of genotypes for feed efficiency differed depending on the definition of feed efficiency used. Performance of animals grouped on alternative definitions of feed efficiency showed that conventional definitions such as feed conversion efficiency or residual feed intake may be inappropriate measures of efficiency for lactating dairy cows. An alternative definition, residual solids production, is proposed. This definition of feed efficiency identifies animals that produce greater volumes of milk solids at similar levels of feed intake without excessive body tissue mobilization and with improved fertility performance. The results also suggest that although there are differences in feed efficiency between strains of Holstein-Friesian, there is also variation within genotypes so that improvements in feed efficiency can be realized if the appropriate definition of feed efficiency is incorporated into breeding programs. |
| | |
Authors:
|
J Coleman; D P Berry; K M Pierce; A Brennan; B Horan |
Related Documents
:
|
3027145 - Effect of prepartum energy, body condition, and sodium bicarbonate on production of cow... 12703625 - Effects of feeding intensity during the dry period. 2. metabolic and hormonal responses. 1418395 - Follicular dynamics, plasma metabolites, hormones and insulin-like growth factor i (igf... 12201525 - Propionibacteria fed to dairy cows: effects on energy balance, plasma metabolites and h... 654035 - An outbreak of monensin poisoning in adult turkeys. 15894785 - Atorvastatin inhibits calcification and enhances nitric oxide synthase production in th... |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
|
Title: Journal of dairy science Volume: 93 ISSN: 1525-3198 ISO Abbreviation: J. Dairy Sci. Publication Date: 2010 Sep |
Date Detail:
|
Created Date: 2010-08-20 Completed Date: 2010-11-30 Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 2985126R Medline TA: J Dairy Sci Country: United States |
Other Details:
|
Languages: eng Pagination: 4318-31 Citation Subset: IM |
Copyright Information:
|
Copyright (c) 2010 American Dairy Science Association. Published by Elsevier Inc. All rights reserved. |
Affiliation:
|
Teagasc, Moorepark Dairy Production Research Centre, Fermoy, Co. Cork, Ireland. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Animals Cattle / genetics*, physiology Dairying / methods Diet / veterinary Eating / genetics*, physiology Female Genotype Lactation / genetics, physiology Milk / secretion* Quantitative Trait, Heritable |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Increasing milk solids production across lactation through genetic selection and intensive pasture-b...
Next Document: Association between the polymorphism of the goat stearoyl-CoA desaturase 1 (SCD1) gene and milk fatt...