In many countries the system of improvement of livestock is based on the use of pedigree stock in which the breeding standards are much higher. If the differences in feeding and husbandry conditions between improved and improving animales are very high it may be assumed that the discussed system of improvement of animales will not produce the expected results. This trial is intended to reconstitute the system of improvement of livestock in some countries
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 3, Madrid, Spain, 479–483, 1974
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