Ringa-Ošleja Guna, Antāne Vita, Lūsis Ivars, Grantiņa-Ieviņa Lelde, Šteingolde Žanete, Mališevs Artjoms, Bērziņš Aivars
Faculty of Veterinary Medicine, Latvia University of Life Sciences and Technologies, LV-3004 Jelgava, Latvia.
Institute of Food Safety, Animal Health and Environment BIOR, LV-1076 Riga, Latvia.
Animals (Basel). 2023 Nov 18;13(22):3561. doi: 10.3390/ani13223561.
is a widespread pathogen, causing abortions and reproductive disorders in ruminants. The study aimed to evaluate animal reproductive capacity and productivity after abortion, related and unrelated to . We compared data about the abortion time, the outcome of the animals after an abortion, further reproduction, and productivity for -positive ( = 148) and -negative ( = 149) aborted dairy cows and heifers. -positive animals had a positive serological response or presence of DNA at the time of abortion. -positive animals had a significantly higher number of lactations at the time of abortion. However, in the other indicators, we observed no significant differences between the groups. Comparing indicators of all the aborted animals, we found that if animals started a new lactation after abortion, they had a significantly lower milk yield, lower fat, protein, and somatic cell counts (SCCs) in milk during the standard lactation for both primiparous and multiparous cows compared to herd averages in each group. Lower SCCs can be due to animals with a high SCC being culled earlier. We found an economic disadvantage to aborting, not only because of the loss of offspring, but also because of the high culling rate and lower productivity in both primiparous and multiparous cows.
是一种广泛传播的病原体，可导致反刍动物流产和生殖障碍。该研究旨在评估流产后与……相关和不相关的动物生殖能力和生产力。我们比较了流产时间、流产后动物的结局、进一步繁殖情况以及-阳性（=148）和-阴性（=149）流产奶牛和小母牛的生产力数据。-阳性动物在流产时血清学反应呈阳性或存在DNA。-阳性动物在流产时的泌乳次数显著更多。然而，在其他指标方面，我们未观察到两组之间存在显著差异。比较所有流产动物的指标，我们发现，如果动物流产后开始新的泌乳期，与每组牛群平均水平相比，初产和经产奶牛在标准泌乳期的产奶量显著更低，牛奶中的脂肪、蛋白质和体细胞计数（SCC）也更低。较低的SCC可能是由于SCC高的动物更早被淘汰。我们发现流产存在经济劣势，不仅因为后代的损失，还因为初产和经产奶牛的高淘汰率和较低的生产力。
