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Влияние хряков мясных пород канадской селекции на откормочные и мясосальные качества помесного молодняка
2009
Fedorenkova, L.A. | Batkovskaya, T.V. | Yanovich, E.A., National Academy of Sciences. Scientific and Practical Center of Animal Breeding (Belarus)
Usage of boars of meat breeds Yorkshire, Duroc and Landrace of Canadian selection for crossing them with cross and pure breeds of sows promotes increase of fattening and meat-fat productivity of the obtained hybrids. The best parameters of feeding efficiency the hybrid young growth of combinations (BMхL)хL and (BMхL)хD at which the age of achievement of alive weight of 100 kg and a daily average gain has made 177,2 day (P less than 0,001) and 803 g (P less than 0,001), 179,5 day (P less than 0,001) and 801 g (P less than 0,001), differed at expenses of a forage of 3,38-3,40 fodder units accordingly
Show more [+] Less [-]Влияние различных факторов на продуктивное долголетие коров
2009
Tanana, N.A. | Korshun, S.I. | Klimov, N.N., Grodno State Agrarian Univ. (Belarus)
In the article showed results of the researches of the influence on productive longevity of cows of such factors, as a linear belonging, a genotype of the father, type of selection are stated. The lead researches have shown, that more longer duration of use characterized the animals belonging to line Siling Trajdzhun Rockit 252803 - 4,5 lactations. Among daughters of various bulls the greatest term of productive use daughters of the bulls the Silach 158 - 5,0 lactations differed. At the maximal deviation in efficiency of ancestors (6001-7000 kg of milk) longevity of their daughters was the greatest and has made 4,18 lactations. The greatest influence on duration of economic use of cows was rendered by specific features of bulls (32,2%) and a linear accessory -12,0%. While the selection variant practically does not influence longevity of animals - a share of influence of 3,7%
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