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The dependence between the polymorphism of transferrin and hemoglobin on the one hand and fecundity on the other was investigated in two flocks of Polish lowLand sheep. No statistically significant differences in the frequency of birth Df twins after ewes and rams of different transferrin and hemoglobin genotypes aere found in any of these flocks. No significant differences were found, either, In...
The respective investigations were carried out at the Agricultural Experiment Station Puczniew on 45 ram-lambs. Thirty lambs originated from commercial crossing of Corriedale sheep with East-Friesian and Finnish rams and 15 lambs constituted Corriedale sheep. All animals were fattened to the liveweight of 40 kg,, then slaughtered and the hind leg was dissected to determine the tissue composition of...
The aim of the work was to determine the relationship between the mean number of lambs reared by mother-ewes and the mean number of lambs born by their daughters originating from three first lambings and later lambings. It has been found that daughters, irrespective of lambing type, of their mothers from which they originate, distinguish themselves with higher fecundity. The calculated coefficients...
Соответствующие исследования проводились в период 1979-1984 гг. в двух стадах овец поморской разновидности, со средней численностью основного стада: I - 990 овцематок и II - 562 овцематок. В стаде I проводилась дополнительно селекция с точки зрения ягнят происходящих из близнецевых окотов. Определяли: 1) показатели оплотворимости плодовитости и выращивания ягнят, 2) зависимость между типом первого...
В 1963 г в Сельскохозяйственной опытной станции Пучнев, а в 1964 г. в Сельскохозяйственной опытной станции Желязна анализировали влияние селекционных факторов на выживальную способность ягнят. Исследования охватывали соответственно 453 и 1080 ягнят в отдельных стадах. В обоих стадах установлено существенное влияние веса тела после рождения на выживаемость, а жлияние типа родов было подтвержвено статистически...
The aim of the respective investigations was to compare the effect of intensive feeding of lowland sheep ewes with silage and meadow hay as well as with green fodder of alfalfa and concentrated feeds on the reproduction indices. The experiment was carried out in the period July 26 - October 23, 1984 on 120 ewes divided into 4 feeding groups (by 30 ewes in each group). Ewes of the groups I, II and...
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