[Relationship between placental weight and the weight of sheep and of lambs at birth].
In 1972--1973 a study was carried out on the sheep flock at the Barley at Institute, Karnobat, to establish the correlation between the weight of placenta and the weight of ewes at impregnation and at giving birth, on the one hand, and the correlation between the weight of placenta and the weight of lambs at birth, on the other hand. The influence of the age of ewes on the weight of placenta was also followed up. Studies were organized with two breed groups of sheep--the newly developed ewe for Southeast Bulgaria, and the Karnobat ewe. It was found that weight of placenta correlated with the weight of lambs at birth in both groups. The dependence was evaluated as well as expressed in twin lambs and as average in single lambs. Both at impregnation and at lambing there was a very good correlation between the weight of placenta and the weight of ewes, which, in the second case, though demonstrated too, was more slightly expressed. The age of ewes was shown to have a statistically significant effect on the weight of placenta in the new fine-wooled sheep breed, which is being developed for the region of Southeast Bulgaria.
D000704:Analysis of Variance; D000818:Animals; D000831:Animals, Newborn / Q000502:physiology*; D001724:Birth Weight; D001835:Body Weight; D002031:Bulgaria; D005260:Female; D009929:Organ Size; D010920:Placenta; D011247:Pregnancy; D012756:Sheep / Q000502:physiology*
Prouchvane zavisimostta tegloto na platsentata i tegloto na ovtsete i na agnetata pri razhdane.