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Fırat Üniversitesi Sağlık Bilimleri Veteriner Dergisi
2001, Cilt 15, Sayı 1, Sayfa(lar) 057-066
[ Turkish ] [ PDF ]
A Study on Some Serum Mineral Levels of Cows with Regular and Irregular Estrus Cycles
Hamit YILDIZ, Halis ÖCAL
Fırat Üniversitesi Veteriner Fakültesi, Elazığ-TÜRKİYE
Keywords: Estrus Cycle, Cow, Ca, Zn, Cu, K and Mg

This study was carried out to determine the presence of any differences between the serum levels of calcium, zinc, copper, potassium and magnesium in cows with regular and irregular estrus cycles.

The study was conducted on a total of 16 cows between June-August of 1996 and January-March of 1997 year. The estrus cycles of these animals were synchronized using prostoglandin F-2 alpha and their blood samples were collected overnight during a cycle, starting on the following estrus of the synchronization. The cows having estrus around 21 days after synchronization were allocated to regular estrus cycle group (group A) and those with no sign of estrus at this particular time were allocated to irregular estrus cycle group (group B).

Serum Ca level on days 10, 16, and 22, serum Zn level on days 8, 16 and 18 and serum K level on days 0, 2, 8, 10 and 18, of the cycle were found to be significantly higher (P<0.05) in group A than group B. In this respect, no differece was determined between serum Cu and Mg levels of these two groups (P>0.05).

While mean serum levels of Ca, Zn, K and Cu obtained during the sexual cycle were found to be higher in group A than group B cows, difference between mean serum Mg level of these two groups was nonsignificant. When groups A and B were divided into winter and summer subgroups, it was observed that serum Cu, Mg and K levels in group B cows were lower in winter season than summer one. Howewer, there was no seasonal variation between serum Ca and Zn levels (P>0.05) in this group. In group A, serum Zn level was higher, but K was lower in winter than summer season. On the other hand, there was no difference (P>0.05) between winter and summer seasons of the same group regarding to serum Ca, Cu and K levels.

In conclusion, the findings of the present study show that serum Ca, Zn, Cu and K levels of cows with regular estrus cycle (group A) were significantly higher than those with irregular estrus cycle (group B), whereas difference between the serum Mg level of the same groups was nonsignificant.


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