The change of dry matter intake, milk yield and bone turnover in primiparous cows compared to multiparous cows during early lactation |
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| Authors: | Yuko IWAMA Mitsuru KAMIYA Masahito TANAKA Shigeru SHIOYA |
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| Institution: | National Agricultural Research Center for Kyushu Okinawa Region, Nishigoshi-machi, Kumamoto-ken and; National Institute of Livestock and Grassland Science, Nishinasuno-machi, Tochigi-ken, Japan |
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| Abstract: | Data from six primiparous and nine multiparous Holstein cows were used to clarify the difference of Ca and P mobilization between primiparous and multiparous cows during early lactation. The dry matter intake (DMI) of primiparous cows was lower (P < 0.01) than those of multiparous cows. Milk yield was lower in primiparous cows at 7, 14, 21 (P < 0.01), and 28 days (P < 0.05) after parturition. There was no significant difference in milk Ca and P concentrations between primiparous and multiparous cows. There were no significant differences in plasma Ca and P concentrations between primiparous and multiparous cows. The plasma P level at 7 days postpartum in primiparous cows was lower (P < 0.05) than 28 days postpartum. The concentration of plasma osteocalcin (OC) measured as bone formation marker of primiparous cows was significantly higher than multiparous cows (P < 0.01) at 21 and 28 days postpartum. The urinary deoxypyridinoline (DPD) as bone resorption marker of primiparous cows tended to be higher (P < 0.10) than multiparous cows at 21 days after parturition and decreased to the same level as that of multiparae toward the peak lactation. These results show that Ca and P mobilization of primiparous cows are more active than multiparous cows. |
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| Keywords: | bone early lactation mineral primiparous cow |
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