The study has stated that heifer replacements, from the date of birth to 18 months, got through transplantation of frozen-defrosted embryos were not inferior to and in many cases superior to the heifers of their age but got through traditional reproduction. Transplant first-calf heifers have a high level of milk productivity which amounts to 7536,10 kilos, with 3,62% of fat and 3,23% of protein. Thus they provide a good selection material for new generation champions to be chosen among them and for being used as mothers of bulls for service

Division of selection area at rest and feeding areas and setting the straw bedding norms for heifers of 6-12 months of age as 2 kg per animal daily, 13-16 months of age – 3 kg and 17-25 months of age – 4 kg promotes increases of average daily live weight gains compared to traditional technological solutions and norms at 6,4%, hemoglobin content – at 3,7%, erythrocyte quantify – at 5,6%

Study of parasitocoenoses of digestive system of Ayrshire breeds of cows and heifers was realized in the conditions of the Republic of Belarus. In course of investigation there was presented a highly efficient universal sedimentation and flotation method with centrifuging for diagnostic of low intensity infestations of cattle. Heifers of Ayrshire breed the total infestation with parasites of gastro-intestinal tract was 100%. Species composition of parasites per one animal was 2,0 +/- 0,258. In winter period the components of parasitoses of a digestive tract were the following: eimeria, strongylats, fascioles, moniezia, nematodes, trematodes and cestodes. In cows of Ayrshire breed the total infestation was also 100%, mixed infestation – 70,0 %. Species composition of parasites per one animal was 2,55 +/- 0,170. In winter period the components of parasitoses of a digestive tract were the following: eimeria, strongylats, fascioles, and capillariasis

In course of realized in the conditions of the Republic of Belarus evaluation of growing intensity and level of meat productivity depending on cattle sex there was conducted the scientific and economic experiment by an example of two groups of white-and-black bull-calves and heifer calves. In the first growing period the animals of experimental groups were fed with milk substitute. At the stage of completion of growing and fattening the bulls and heifers of experimental groups obtained ration containing haylage, plus 2 kg of flattened grains and 2 kg mixed fodders. Results of linear and weight indexes analysis showed that in changes of exterior of bulls and heifers of black-and-white breed there was noted a certain regularities in their growth and development. The most intensive growth and development of analyzed young cattle was stated at age from 6 till 12 months. At the same time, bulls exceeded heifers according to the main exterior indexes. According to the visual evaluation of bulls and heifers there were determined the differences in constitutional type

Feeding replacement heifers of 6-12 months of age with mixed feed that contains 20-25% of rape and lupine grain within winter and summer diets instead of sunflower cake allows to obtain the average daily weight gain of 893-927 g at forage spends of 6,0-6,3 с of forage units. The cost of these mixed feeds is decreased at 14% and prime cost of 1 c of weigh gain-at 6-15%

Results of the scientifically-economic experience lead in farm Zarechje (Smolevichskij district of the Minsk area) have shown, that perfect metabolizable energy concentration in dry matter of a diet at milking period for first-calve cows is 11,7 MJ/kg. It allows to increase natural milk productivity at 8,24% (27,4 against 25,4 kg) and 4%-milk outcome – at 8,93% as well as effective usage of metabolizable energy for production up to 4,9% (P less than 0,01) and minimum of production warmth loses

Perfect norms of floor area and feeding front are determined for replacement heifers on free stall management. These norms promote creation of more comfortable conditions of management, increase of average daily live weight gains at 9,1%, hemoglobin content – at 4,8%, erythrocyte quantity – at 6,3%