Department of Animal Nutrition, Faculty of Animal Husbandry & Veterinary Sciences, The University of Agriculture, Peshawar, Pakistan.
Department of Zoology, Government College University, Faisalabad, Pakistan.
Reprod Domest Anim. 2024 Jan;59(1):e14525. doi: 10.1111/rda.14525.
This research focused on evaluating blood mineral levels and malondialdehyde (MDA) as an indicator of oxidative stress before and after giving birth in Achai and Holstein Friesian (HF) dairy cows. Blood samples were obtained from a total of 50 cows representing both breeds on the third, second, and first week prior to calving, as well as on the day of calving (day 0). Subsequently, samples were collected on the 1-3 weeks postpartum to allow a comprehensive evaluation of blood parameters throughout the peripartum period. Results showed a significant (p < .01) decrease in serum zinc (Zn) levels on the day of parturition in both breeds. Additionally, HF cows exhibited higher (p < .01) Zn levels on week 2 before giving birth. Interestingly, blood selenium (Se) concentration increased (p < .01) in HF cows on weeks 2 and 3 after calving. In contrast, Achai cows showed a rise (p < .01) in blood Se on week 3 of parturition. Blood copper (Cu) levels were higher (p < .01) on weeks 2 and 3 after parturition in HF cows and on third week before parturition compared to Achai cows, where serum Cu remained high on week 1 of parturition. The findings indicated that blood magnesium (Mg) was higher (p < .01) on third week before parturition in Achai cows and on weeks 2 and 3 after parturition. Serum calcium (Ca) was higher (p < .01) in both HF and Achai cows on weeks 2 and 3 after parturition, and lower (p < .01) on third week before giving birth in both breeds. The mean blood MDA levels in Achai cows were lower (p < .01) on weeks 1 to 3 postpartum or 3 weeks before giving birth. In HF cows, serum MDA increased (p < .01) just before 2 weeks of parturition and remained elevated until 3 weeks of parturition. Thus, both breeds exhibited a similar pattern of mineral fluctuations; yet, Achai cows demonstrated greater resilience to oxidative stress compared to HF cows during the transition period.
本研究旨在评估阿柴和荷斯坦弗里生（HF）奶牛分娩前后的血液矿物质水平和丙二醛（MDA）作为氧化应激的指标。在分娩前第三周、第二周和第一周以及分娩当天（第 0 天），共采集了 50 头奶牛的血液样本，随后在产后第 1-3 周采集样本，以全面评估围产期的血液参数。结果表明，两种牛的血清锌（Zn）水平在分娩当天均显著下降（p<0.01）。此外，HF 牛在分娩前两周的 Zn 水平更高（p<0.01）。有趣的是，HF 牛在分娩后第 2 周和第 3 周的血液硒（Se）浓度增加（p<0.01）。相反，阿柴牛在分娩第 3 周的血液 Se 水平升高（p<0.01）。HF 牛在分娩后第 2 周和第 3 周的血液铜（Cu）水平更高（p<0.01），而在分娩前第 3 周的血液 Cu 水平也高于阿柴牛，阿柴牛在分娩第 1 周的血清 Cu 水平仍较高。研究结果表明，阿柴牛在分娩前第 3 周的血液镁（Mg）水平较高（p<0.01），HF 牛在分娩后第 2 周和第 3 周的血液 Mg 水平较高。分娩后第 2 周和第 3 周，HF 和阿柴牛的血清钙（Ca）水平均较高（p<0.01），而在分娩前第 3 周，两种牛的血清 Ca 水平均较低（p<0.01）。阿柴牛产后第 1 周到第 3 周或分娩前 3 周的平均血液 MDA 水平较低（p<0.01）。HF 牛的血清 MDA 在分娩前两周开始增加（p<0.01），并一直持续到分娩后 3 周。因此，两种牛的矿物质波动模式相似；然而，与 HF 牛相比，阿柴牛在过渡期间对氧化应激表现出更强的抵抗力。
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