When back in 1949, in London, observed that, with the addition of glycerol to the mixture thinner egg yolk, and sodium citrate, the sperm from a rooster were still alive after defrosting, has revolutionized the genetic improvement of dairy cattle on the planet. In the 1970s it generalizes the artificial insemination bulls Dutch Argentine leaving behind definitely the use of dual-purpose breed of that era (see Photo). In the year 2009, we introduce the genomic analysis of bulls parents becoming the most relevant technique since the implementation of artificial insemination.
After the disclosure of the artificial insemination, the rodeo lechero argentino was growing in his genetic value staying for years comfortably in excess of what the local production systems based on grazing, may require. In recent years, the improvement in power and the care of the issues relating to the welfare animal with incorporation of confinement stabled (observed mostly in the central basin of Argentina), have led to the cows to get productions rash and no longer need to travel to California to see rodeos up of 40 litres. The chart "Evolution of individual production" is an update weighted average from the one presented in "50 years of the history of the dairy industry in Argentina". The increasing dissemination of these new forms of production, which also include technological support novel as the advent of necklaces monitoring or milking robot, forces the producer to select the best cows to put in those sheds.
To accelerate the genetic improvement
With the advent of the genomic bulls stopped being those “adventures” that were forced to wait for the development of the seed and see what results I had. Now, taking the bulls parents genotyped, and with a system of records of services and relationship mother-daughter earnest and methodical, you can carry forward the genomic analysis by genealogy for females rodeo dairy obtaining information of the genetic value of all the rodeo of a dairy farm with good correlation with the analysis of DNA (60-70%). This information is customized to adapt to the vision that you have of the future rodeo. For the case of the following chart, the Index Genetic responds to a scheme of improvement with 60% for traits productive and 40% for traits of health and efficiency. There are concepts that arise from the image. First note we improved genetics in the new generations of rodeo, in the second place, we observe that the cows of more than 2 lactations are almost all below average! And then we noticed the important scattering within the same generation of animals.
A strategy to accelerate the genetic improvement observed could be the use of sexed semen (cuatriplica the daughters obtained that enter the production than the conventional semen) of the best bulls available (today get sexed bulls TOP) in the 30% of the population, the superior in Index Genetic. This selection covers a good part of the virgin females and in first lactation. In this first instance, it could be sampled for DNA analysis in order to confirm the Index family. In the meantime we will wait to bring the level of the Index of the rodeo on the bulls parents and lower the cost of genomic analysis that todaythe full version of the analysis) is about 45 US$/animal depending on the traits to ask.
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