Journal ArticleDOI
Genetic parameters and evaluations from single- and multiple-trait analysis of dairy cow fertility and milk production
TLDR
Two-trait analysis of fertility and milk yield was investigated as a method to estimate fertility breeding values when culling or selection based on milk yield in early lactation determines presence or absence of fertility observations in later lactations.About:
This article is published in Livestock Production Science.The article was published on 2003-06-01. It has received 167 citations till now. The article focuses on the topics: Fertility & Heritability.read more
Citations
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Journal ArticleDOI
Selection Indices in Holstein Cattle of Various Countries
TL;DR: Broadening of breeding goals through recent changes to selection indices decreased the similarities of top bull listings across the various countries, with a slightly greater commonality among sires of top bulls.
Journal ArticleDOI
Estimates of Genetic Parameters for Canadian Holstein Female Reproduction Traits
TL;DR: Genetic correlations among traits indicated that different traits measured different aspects of reproductive performance of a dairy cow could be used jointly in a fertility index to allow for selection for better fertility of dairy cattle.
Journal ArticleDOI
Genetic Relationships Between Persistency and Reproductive Performance in First-Lactation Canadian Holsteins
TL;DR: Estimates of genetic relationships between lactation persistency and reproductive performance in first lactation and relationships with day in milk at peak milk yield and estimated 305-d milk yield found heifers younger than average when first inseminated and/or conceived successfully at first inSEmination tended to have a more persistentFirst lactation.
Journal ArticleDOI
Assessing the Association of the Level of Milk Production with Reproductive Performance in Dairy Cattle
TL;DR: This paper reviews methods of measuring reproductive performance and the association of the level of milk production with pregnancy rate at the herd and individual levels, and it is not clear if there is any association between higher milk yield and the probability and timing of pregnancy.
Journal ArticleDOI
Relationship between reproduction traits and functional longevity in canadian dairy cattle.
A. Sewalem,A. Sewalem,Filippo Miglior,Filippo Miglior,G.J. Kistemaker,P G Sullivan,B J Van Doormaal +6 more
TL;DR: Increased risk of culling was observed for cows that required hard pull, calved small calves, or dead calves, and cows that require more services per conception were at greater risk of being culled.
References
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Organic livestock farming: A critical review
TL;DR: In this paper, the authors give an overview of the present state of the art in the different issues of organic livestock farming and discuss the possibilities and limitations to perform the self-aimed goals under the basic standards of organic farming.
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Genetic and phenotypic parameters for 305-day yield, fertility, and survival in Holsteins.
C.M.B. Dematawewa,P.J. Berger +1 more
TL;DR: Management practices seem to keep mortality rates of high producing cows lower even though those cows have lower genetic potential for survival than do the low producers, as measured by yield, fertility and cow survival estimates.
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Genetic aspects of common health disorders and measures of fertility in Holstein Friesian dairy cattle.
TL;DR: The unfavourable correlation between milk yield and health and fertility traits, plus the economic importance of the latter, suggests that future breeding goals should be expanded to include some health disorders and fertility.
Journal ArticleDOI
Linear and threshold model genetic parameters for disease, fertility and milk production in dairy cattle
TL;DR: Results show that future selection programmes should include disease and fertility for genetic improvement of health and reproduction and for sustained economic growth in the dairy cattle industry.
Journal ArticleDOI
Relationships between clinical mastitis, somatic cell score, and production for the first three lactations of Finnish Ayrshire.
Jukka Pösö,Esa Mäntysaari +1 more
TL;DR: A clear, antagonistic genetic association existed between clinical mastitis and milkProduction, but the genetic correlation of SCS and milk production did not differ from 0.37 for first lactation to 0.68 for third lactation, implying that clinicalmastitis and SCC monitor different aspects of udder health.