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Hosseini, Seyed Edris, Pourjafar, Mehrdad, Badiei, Khalil, Chalmeh, Aliasghar, Kafi, Mojtaba, Sharifi Yazdi, Hassan, Mirzaei, Abdollah, Khedri, Arash. (1405). Influences of Cool and Warm Periods on Clinical and Subclinical Hypocalcemia in Postpartum Dairy Cows. , (), -. doi: 10.22059/ijvm.2026.407138.1005981
Seyed Edris Hosseini; Mehrdad Pourjafar; Khalil Badiei; Aliasghar Chalmeh; Mojtaba Kafi; Hassan Sharifi Yazdi; Abdollah Mirzaei; Arash Khedri. "Influences of Cool and Warm Periods on Clinical and Subclinical Hypocalcemia in Postpartum Dairy Cows". , , , 1405, -. doi: 10.22059/ijvm.2026.407138.1005981
Hosseini, Seyed Edris, Pourjafar, Mehrdad, Badiei, Khalil, Chalmeh, Aliasghar, Kafi, Mojtaba, Sharifi Yazdi, Hassan, Mirzaei, Abdollah, Khedri, Arash. (1405). 'Influences of Cool and Warm Periods on Clinical and Subclinical Hypocalcemia in Postpartum Dairy Cows', , (), pp. -. doi: 10.22059/ijvm.2026.407138.1005981
Hosseini, Seyed Edris, Pourjafar, Mehrdad, Badiei, Khalil, Chalmeh, Aliasghar, Kafi, Mojtaba, Sharifi Yazdi, Hassan, Mirzaei, Abdollah, Khedri, Arash. Influences of Cool and Warm Periods on Clinical and Subclinical Hypocalcemia in Postpartum Dairy Cows. , 1405; (): -. doi: 10.22059/ijvm.2026.407138.1005981

Influences of Cool and Warm Periods on Clinical and Subclinical Hypocalcemia in Postpartum Dairy Cows

Iranian Journal of Veterinary Medicine
مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 30 خرداد 1405
نوع مقاله: Original Articles
شناسه دیجیتال (DOI): 10.22059/ijvm.2026.407138.1005981
نویسندگان
Seyed Edris Hosseini1؛ Mehrdad Pourjafar1؛ Khalil Badiei1؛ Aliasghar Chalmeh* 2؛ Mojtaba Kafi1؛ Hassan Sharifi Yazdi1؛ Abdollah Mirzaei1؛ Arash Khedri3
1Department of Clinical Sciences, School of Veterinary Medicine, Shiraz University, Shiraz, Iran
2D.V.M; Ph.D; Assistant Professor of Large Animal Internal Medicine, Division of Large Animal Internal Medicine; Department of Clinical Sciences; School of Veterinary Medicine; Shiraz University; Shiraz; Iran
3Veterinarian of Iran Dairy Industries Co.; Pegah Fars, Shiraz, Iran
چکیده
BACKGROUND: Subclinical hypocalcemia (SCHC) is a major metabolic disorder in postpartum dairy cows that impairs health and productivity. Although its pathophysiology is known, the cool and warm periods and physiological factors affecting its severity remain insufficiently understood.

OBJECTIVES: This study evaluated cool and warm periods, physiological, and biochemical determinants of SCHC and milk fever (MF) in postpartum dairy cows.

METHODS: Six hundred Holstein cows from a commercial herd in Shiraz, Iran, were evaluated in two cool and warm periods. Cows were classified as Normal, SCHC, or MF and grouped by parity (1 to ≥5). Blood samples collected within 48 ± 8 hours postpartum were analyzed for calcium, phosphorus, magnesium, albumin, vitamin D, and NEFA. Data were analyzed using ANOVA and Pearson correlations.

RESULTS: Calcium concentrations were lowest in MF cows, intermediate in SCHC cows, and highest in Normal cows (P<0.001), while cool and warm periods did not affect calcium. Phosphorus was lowest in MF and highest in Normal cows (P<0.001), with higher values in warm period. Magnesium was significantly lower in warm period (P<0.001). Albumin was lowest in MF cows (P<0.001) and decreased in cool period. Vitamin D was higher in SCHC and MF cows in cool period (P<0.05). Significant correlations were observed between calcium and phosphorus, magnesium, and albumin. Higher-parity cows struggled more to maintain calcium balance.

CONCLUSIONS: SCHC affects postpartum mineral homeostasis. Although mean serum calcium concentration did not differ significantly between cool and warm periods, seasonal changes in magnesium and albumin were significantly correlated with calcium levels and may indirectly affect calcium homeostasis. Cool and warm periods feeding adjustments, mineral supplementation, and monitoring of key biomarkers are essential to reducing SCHC risk and supporting herd health.
کلیدواژه‌ها
Calcium Homeostasis؛ Milk Fever؛ Postpartum Dairy Cows؛ Cool and Warm Periods؛ Subclinical Hypocalcemia
آمار
تعداد مشاهده مقاله: 11





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