Prospects and possibilities of milk composition's improvement by breeding
1990
Bozo, S. (Allattenyesztesi es Takarmanyozasi Kutatokozpont, Godollo (Hungary). Allattenyesztesi Kutatointezet)
While the milk production in Hungary doubled in the last 15 years, because of the significant proportion of Holstein-Friesian crossbred cows, the nutrient value especially fat and protein content/ of the milk deteriorated. It can be proposed on the basis of a detailed assessment and evaluation of several criteria that the selection especially at the Holstein-Frisians be based on the joint fat and protein quantity. The criteria are the following; milk fat and protein content in the average of numerous milk samples, milk fat and protein content ratio, transport costs, cow live weight, nutrient requirement of the individuals, correlation between the preceding two, the deviation from the average /expressed in deviation units/ of the hereditary value of breeding bulls belonging in different characteristics to the best 5 o/o. Disqualifying levels must be set up at milk protein and fat content. Improvement in the interest of raw milk protein and fat content increase can be reached by the introduction of Jersey genes. A good alternative is, in this respect, the Hungarofriesian /75,2 o/o Holstein and 25 o/o Danish Jersey gen ratio/ lactating better than the Holstein-Friesian, especially in the region of towns with great consumption.
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