We investigated the effect of parity number on the dry matter intake (DMI) of cows during the first week after calving. Eighty-three cows were evaluated from 14 days before to 7 days after calving. DMI and milk yield were measured for 7 days after calving, and the calving score was measured. Blood samples were collected throughout the experiment. The average DMI during the first week after calving was reduced in the first-lactation heifers and high-parity number cows. A quadratic relationship between the parity number and the DMI was observed. The first-lactation heifers had lower prepartum serum total protein (TP) concentration and milk yield, higher prepartum serum nonesterified fatty acid (NEFA) concentration and calving score than the multiparous cows. The recovery rate of serum calcium (Ca) after calving was slow in the cows in the parity 6. The DMI was positively affected by the serum Ca concentration after calving, milk yield, and prepartum serum TP concentration and was negatively affected by the calving score and prepartum serum NEFA concentration. We conclude that the DMI immediately after calving tends to be lower in first-lactation heifers and high-parity number cows, but factors that reduce the DMI differ according to parity number.

中文翻译：

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胎次对产后第一周奶牛干物质采食量的影响。

我们调查了胎次对产犊后第一周奶牛干物质采食量 (DMI) 的影响。从产犊前 14 天到产后 7 天对 83 头奶牛进行了评估。产犊后7天测量DMI和产奶量，并测量产犊评分。在整个实验过程中收集血样。产犊后第一周的平均 DMI 在第一次泌乳的小母牛和高胎次母牛中有所降低。观察到奇偶校验数和 DMI 之间的二次关系。与经产奶牛相比，初乳小母牛产前血清总蛋白（TP）浓度和产奶量较低，产前血清非酯化脂肪酸（NEFA）浓度和产犊评分较高。6 胎奶牛产后血清钙 (Ca) 的恢复速度较慢。DMI 受产犊后血清钙浓度、产奶量和产前血清 TP 浓度的正向影响，而受产犊评分和产前血清 NEFA 浓度的负向影响。我们得出的结论是，初产母牛和胎次多的母牛产犊后的 DMI 往往较低，但降低 DMI 的因素因胎次数而异。