Heterogeneity of genetic parameters for calving difficulty in Holstein heifers in Ireland.

Heterogeneity of genetic parameters for calving difficulty in Holstein heifers in Ireland. Research Abstract Details 

Research Abstract Table of Contents

Jump to the:

Heterogeneity of genetic parameters for calving difficulty in Holstein heifers in Ireland. Abstract Text:

J M Hickey,M G Keane,D A Kenny,A R Cromie,P R Amer,R F Veerkamp,

Calving difficulty is a trait that greatly affects animal welfare, herd profitability, and the amount of labor required by cattle farmers. It is influenced by direct and maternal genetic components. Selection and breeding strategies can optimize the accuracy of genetic evaluations and correctly emphasize calving difficulty in multiple-trait indices provided there are accurate estimates of genetic parameters. In Ireland, large differences exist in the age at which heifers first give birth to calves. The objective of this study was to estimate genetic parameters for calving difficulty in first-parity Holsteins and to determine whether these differed with age of the heifer at calving. Transformed calving difficulty records for 18,798 Holstein heifers, which calved between January 2002 and May 2006, were analyzed using univariate, multitrait, and random regression linear sire-maternal grandsire models. The model that 1) fitted a second-order random regression of dam age at first parity for the direct component, 2) treated the maternal component as a single trait regardless of dam age, and 3) fitted a single residual variance component was optimal. Heritabilities for direct (0.13) and maternal (0.04) calving difficulty were significantly different from zero. These 2 components were moderately negatively correlated (-0.47). Estimates of direct genetic variance and heritability were heterogeneous along the dam age trajectory, decreasing initially with dam age before subsequently increasing. Heritability estimates ranged between 0.11 and 0.37 and were higher for records with younger and older dams at parturition. Genetic correlations between the direct components of calving difficulty decreased from unity to 0.5 with increasing distance between dam ages at parturition. The results of this study indicated that heterogeneity of direct genetic variance existed for calving difficulty, depending on dam age at first parturition.

Heterogeneity of genetic parameters for calving difficulty in Holstein heifers in Ireland. Publishing Authors By Initials

JM Hickey,MG Keane,DA Kenny,AR Cromie,PR Amer,RF Veerkamp,

For similar reproductive and urinary physiology: reproduction: pregnancy research abstracts see: reproductive and urinary physiology: reproduction: pregnancy research

PUBMED ID PMID:

MEDLINE DATE:

Heterogeneity of genetic parameters for calving difficulty in Holstein heifers in Ireland. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of dairy science

VOLUME: 90

Page Numbers: 3900-8

Journal Abbreviation: J. Dairy Sci.

ISSN: 1525-3198

DAY: 20

MONTH: Aug

YEAR: 2007

Heterogeneity of genetic parameters for calving difficulty in Holstein heifers in Ireland. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 2985126

Heterogeneity of genetic parameters for calving difficulty in Holstein heifers in Ireland. Keywords Mesh Terms:

KEYWORDS: Pregnancy

MESH TERMS: veterinary

Chemical & Substance for Abstract: Heterogeneity of genetic parameters for calving difficulty in Holstein heifers in Ireland. Information

Substance Name:

Registry Number:

Grant and Affiliation Information for Heterogeneity of genetic parameters for calving difficulty in Holstein heifers in Ireland.

AFFILIATION: Grange Beef Research Centre, Teagasc, Dunsany, Co. Meath, Ireland. John.Hickey@wur.nl

Country: United States

AGENCY:

GRANT:

ACRONYM:

MEDLINETA: J Dairy Sci

REFSOURCE:

DATABASENAME:

ACCESSION NUMBER:

Number Hits: 0

Heterogeneity of genetic parameters for calving difficulty in Holstein heifers in Ireland Related Publications

• Accuracy of breeding values when using and ignoring the polygenic effect in genomic breeding value estimation with a marker density of one SNP per cM.
• Accuracy of genomic selection using different methods to define haplotypes.
• Breeding value estimation for fat percentage using dense markers on Bos taurus autosome 14.
• Effects of genotype by environment interactions on milk yield, energy balance, and protein balance.
• Effects of management and genetics on udder health and milk composition in dairy cows.
• Estimation of accuracy and bias in genetic evaluations with genetic groups using sampling.
• Genotype by environment interaction for somatic cell score across bulk milk somatic cell count and days in milk.
• Heterogeneity of genetic parameters for calving difficulty in Holstein heifers in Ireland.
• Hypomineralized second primary molars: prevalence data in Dutch 5-year-olds.
• Micro phosphatase determination in 0.01 ml tissue extract or blood serum.
• Relationship between milk progesterone profiles and genetic merit for milk production, milking frequency, and feeding regimen in dairy cattle.
• [Treatability of children according to Dutch dentists]