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Female fertility in French dairy breeds: current situation and strategies for improvement Inra
Barbat, A.; Le Mézec, P.; Ducrocq, V.; Mattalia, S.; Fritz, S.; Boichard, D.; Ponsart, C.; Humblot, P..
In most countries where genetic selection for milk production has been conducted, a continuous degradation of reproductive performances has been observed in dairy cattle. This paper describes the phenotypic evolution of fertility traits in France for the main 3 dairy breeds and the different actions undertaken to counteract this unfavourable evolution of reproductive performance. In 2001, functional traits (including conception rate as a fertility trait) have been included into the French total merit index ISU, to take these traits into account in the selection objective. In addition, a marker-assisted selection (MAS) program has been developed since 2001. Through this approach, a set of QTL related to fertility traits were identified using the phenotypic...
Tipo: Journal Article Palavras-chave: DAIRY CATTLE; FERTILITY; GENETIC SELECTION; PHENOTYPING; REPRODUCTIVE GENOMICS.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010e002cb0a&uri=/notices/prodinra1/2010/11/
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Leaf growth rate per unit thermal time follows QTL-dependent daily patterns in hundreds of maize lines under naturally fluctuating conditions Inra
Sadok, W.; Naudin, P.; Boussuge, B.; Muller, B.; Welcker, C.; Tardieu, F..
We have analysed daily patterns of leaf elongation rate (LER) in large data sets with 318 genotypes placed in naturally fluctuating temperature and evaporative demand, and examined the effect of targeted alleles on these patterns. The method consisted, firstly, in expressing elongation rate per unit thermal time, so it became temperature independent; secondly, in a joint analysis of diurnal fluctuations of elongation rate and of micrometeorological conditions in several experiments, and finally, in a comparison of daily patterns between groups of genotypes possessing targeted alleles. (1) Conditions for using thermal time at a time step of 15 min were first tested successfully in 318 recombinant inbred lines (RILs) of three mapping populations. (2) An...
Tipo: Journal Article Palavras-chave: CROISSANCE FOLIAIRE EVAPORATIVE DEMAND; PHENOTYPING; TIME COURSE.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008f59625de&uri=/notices/prodinra1/2008/10/
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