In the last 50 years the increasing of milk production, the intensive genetic selection, improved feeding and technological advancements induced the appearance of other problems. Views and opinions on the advantages and disadvantages of twin pregnancy have constantly been changed over the last 50-60 years. Most professionals believe that twin pregnancy is not desirable due to several disadvantages (dystocia, retained foetal membranes, abortion, early pregnancy loss, higher culling rate, etc.) caused by twin calving. The extremely high physiological stress around calving leads to decline of fertility rates and prolonged number of open days, which are risk factors of rentability. Incidence of twin pregnancy sometimes reaches 23.9%, however, the proportion of twin calving is much less due to late embryonic and early pregnancy loss. It means that beside the physiological/production disadvantages twin pregnancy/twin calving also can cause economic losses. However, in sheep there is a strong need to improve the reproduction potential (progeny per ewe). The principal aim on sheep farms is the lamb production, which is limited because of the seasonality of reproduction. The main factor of economic production is to exploit maximally the reproduction performance of ewes.
|Number of pages||14|
|Journal||Magyar Allatorvosok Lapja|
|Publication status||Published - Oct 1 2013|
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