Influence of climatic elements on the reproductive traits of Romanov sheep in the Bilogora region, Croatia

The study aimed to determine the influence of air temperature, amount precipitation and sunlight duration on reproductive traits Romanov sheep in Bilogora region, Croatia.Animals were kept a fenced rotating pasture with access stables during night. Sheep naturally mated. During three consecutive years (2019-2021), performance data collected for four flocks (n=26-57). Data duration, daily volumes obtained from Croatian Meteorological Hydrological Service (CMHS), Zagreb, Croatia, nearest meteorological recording station, located within 5-15 km farms. A total 425 ewes mated, which 399 successfully conceived 851 lambs born, an average litter size 1.63. fertility was 93.88%. Lambing distribution not equally distributed throughout year as 73% all born winter spring (winter 51.88%; 21.31%; summer 13.53% autumn 13.28%). Sexual activity lowest end March May, while peak sexual August October. There positive or negative correlation (P<0.0001 (Kruskall-Wallis)) between sunshine certain (number pregnant non-pregnant ewes). Daily temperatures highest but drop suddenly at start breeding season early autumn. Also, day begins shorten, night become longer is crucial shortday breeder species such goats. Other factors, relative humidity rainfall, can also directly indirectly impact significantly affect fertility. results indicate that precipitation, different months seasons could Croatia.