Veterinary Practice Đurđevac, Đurđevac, Croatia.
Croatian Veterinary Institute, Zagreb, Croatia.
Int J Biometeorol. 2019 Jun;63(6):817-824. doi: 10.1007/s00484-019-01696-z. Epub 2019 Feb 21.
The aim of this study was to investigate the influence of season, rainfall and air temperature on the reproductive efficiency in the Romanov breed of sheep in continental part of Croatia during five consecutive years (2012-2016). During this period, 5379 matings resulted in 5046 successful conceptions, i.e. lambings at eight medium-scale Romanov breed sheep farms. The conception rate was 93.81%, fecundity was 195% and average preweaning mortality until 90 days of age was 12.41%. The seasonal distribution of lambings was 47.64% for ewes that delivered in winter (n = 2422), 23.37% in spring (n = 1179), 18.82% in summer (n = 950) and 9.81% in autumn (n = 495). Sexual activity was lowest during spring and early summer when air temperatures were above average (very and extremely warm), and sexual activity peaked from August to September, especially during extremely wet and very wet seasons. Litter size was greater during winter than in other seasons (1.70 vs. 1.54) and was significantly different as compared to each of selected years of the study period. There was a statistically significant difference in the number of pregnant ewes between mating seasons. Most female Romanov lambs born during winter and early spring mated in late summer or autumn and delivered at the age of 1 year or earlier. The seasonal distribution of matings and lambing was not uniform throughout the seasons over five consecutive years. Thus, it can be assumed that air temperature and rainfall during different seasons could affect the reproductive efficiency in Romanov breed of sheep in continental part of Croatia.
本研究旨在调查季节、降雨和空气温度对克罗地亚大陆地区罗曼诺夫品种绵羊在连续五年（2012-2016 年）的繁殖效率的影响。在此期间，5379 次配种导致 5046 次成功受孕，即在八家中等规模的罗曼诺夫品种绵羊养殖场进行产羔。受孕率为 93.81%，产仔数为 195%，平均断奶前死亡率为 90 日龄前 12.41%。产羔的季节性分布为：冬季（n=2422）产羔的母羊占 47.64%，春季（n=1179）产羔的母羊占 23.37%，夏季（n=950）产羔的母羊占 18.82%，秋季（n=495）产羔的母羊占 9.81%。当空气温度高于平均水平（非常暖和和极暖和）时，绵羊的性活动最低，而性活动在 8 月至 9 月达到高峰，尤其是在非常潮湿和极潮湿的季节。冬季的产仔数大于其他季节（1.70 比 1.54），与研究期间的每个选定年份相比均有显著差异。在配种季节之间，妊娠母羊的数量存在统计学上的显著差异。冬季和早春出生的大多数罗曼诺夫母羊在夏末或秋季交配，并在 1 岁或更年轻时产羔。在连续五年的五个季节中，配种和产羔的季节性分布并不均匀。因此，可以假设不同季节的空气温度和降雨量可能会影响克罗地亚大陆地区罗曼诺夫品种绵羊的繁殖效率。
