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Evaluate the reproductive performance of the Wallachian sheep
BALOUNOVÁ, Lucie
The aim of this thesis was to evaluate the level of reproductive performance of the Wallachian sheep in the flock of sheep bred by Jan Vejčík. At first the following parameters were evaluated in 457 ewes during the period 2007 - 2011: fertilization, fertility, reproduction intensity, total rearing, infertility, rearing of lambs born and total mortality of lambs. Then, using statistical methods, frequency of litters and effect of age on fertility of ewes were evaluated and the identified parametres were compared with the flocks originating from the Union of sheep and goats of the Czech Republic. Finally, the economy sales for slaughter lambs depending on fertility was assessed. The mean fertility of the flock of sheep reached 171, 77 % and the percentage of fertilization was 92, 54 %. Total breeding flock was 143, 19 %. Seven percent of the sheep was infertile, which is directly influenced by the intensity of reproduction (158,93 %). Mortality of lambs was 10, 03 % and thus survival rate of lambs was 89,97 %. The study shows that the longer the period of existence of a farm is, the higher the fertility of ewes is (almost 179 % in 2011). Also an increasing tendency of the number of sheep twins was recorded during the study (59 twins in 2011). This indicates good welfare of the animals and generally good health of the flock. Ewes reached the highest fertility at the age of 5 to 7 years. The indicators of fertility, reproduction and total intensity of rearing showed significant differences when compared with the flocks originating from the Union of sheep and goats of the Czech Republic. Significantly higher fertility, reproduction and overall intensity was achieved in the monitored flock The difference was not statistically significant (p > 0,05) except for the fertilization parameter. Sales for slaughter lambs per ewe were affected by the share of reactive sheep and total lamb mortality, this effect was, however, only about 20 % of the total dependency. Disregarding the overall mortality of lambs and reactive sheep, it would be true that higher fertility is in direct proportion with sales for slaughter lambs.
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