Abstract
The investigation was conducted in population of Mis breed of sheep, divided into three groups. For reproduction had use rams of Ile de France breed. Induction and synchronization of oestrus was done off-season in October. The percentage of lambing sheep, sheep fertility, and number of lambs acquired per father, sex and birth type of lambs were observed. Ram 1 had a highest number of ewes lambed with an excellent percentage of mating success and highest fertility rate of ewes with differences on fertility rate of 17% (between group of ewes in ram 1 and ram 2), 36% (group of ewes in ram 1 and ram 3) and 19% (group of ewes in ram 2 and ram 3).The highest birth weight were on lambs born single from ram 3, born twins from ram1, triplets of ram 3. For the lambs born quadruplets (unfortunately only in rams 1 and 2 with one lamb of each was alive) the lamb of ram 2 was higher in birth weight. The male and female lambs of ram 3 got the highest birth weight while the female lambs of ram 1 acquired the lowest birth weight. The highest average birth weight of lambs was born single, male; born triplets? male from lambs of ram 3 having an average birth weight of 6.36kg and 4.0 kg but got the lowest for lambs born twins on female lambs 3.66 kg. The male lambs of ram 1 got the highest average birth weight on lambs born twins with an average birth weight of 4.38 kg but the lowest on triplets born 3.3kg. Unfortunately only one each of the two ram with lambs born quadruplets alive both male and the higher was that lamb of ram 2 with a birth weight of 3.3 kg. Result showed the influence of ram on number of lambs born and lambs? birth weight. Between subject effects Father* birth type showed a significant effect on birth weight of lambs.
Highlights
The most important factor determining the success of sheep production is reproductive efficiency which includes successful lambing (Kutluca Korkmaz and Emsen, 2016)
The ewes mated with the assigned ram and the percentages of mating success are shown in table 1
It indicated that ram 1 had a highest number of ewes lambed with an excellent percentage of mating success while the ram 3 got the lowest number of ewes lambed and the poorest percentage of mating success
Summary
The most important factor determining the success of sheep production is reproductive efficiency which includes successful lambing (Kutluca Korkmaz and Emsen, 2016). The type and continuation of production and the majority of the sheep breeds differ in reproductive behavior depending on the changes in season latitude/longitude, the length of the photoperiod and other factors (Dogan and Nur, 2006; Abu Gazal, 2010, Laleva et al, 2014). The success of genetic improvement is based on expectations that the descendants by their phenotypic values will be above the average values of parents. Expected genetic progress - selection success, it is valued depending on the value of heritability for the given property and the selection differential. Since the degree of inheritance that we call heritability is the ratio of genetic and total phenotypic variance, which means that it is not a biological constant, its value can be different in populations, (Hill, 2014; Petrović and Pantelić, 2015)
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