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首页> 外文期刊>Tropical Animal Health and Production >Relationships between insulin-like growth factor-I, milk yield, body condition score, and postpartum luteal activity in high-producing dairy cows
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Relationships between insulin-like growth factor-I, milk yield, body condition score, and postpartum luteal activity in high-producing dairy cows

机译：高产奶牛中胰岛素样生长因子-I，产奶量，身体状况评分和产后黄体活性之间的关系

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摘要

The relations between body condition score (BCS), milk yield, serum insulin-like growth factor-I (IGF-I) profile, and luteal activity were investigated in postpartum dairy cows. Seventy-one healthy high-producing multiparous Holstein cows were subjected to transrectal ultrasound scanning twice weekly from the first to the eighth week postpartum. Blood samples were collected twice weekly to measure serum progesterone (P4) and every 2 weeks to detect serum IGF-I concentrations. BCS was monitored weekly after calving. Cows with serum P4 concentrations ≥1 ng/ml on at least two consecutive samplings were considered to have commenced luteal activity. Commencement of luteal activity (C-LA) was observed earlier than 45 days postpartum in 71.8% of cows while 28.2% showed C-LA later than 45 days. Prolonged luteal phase was the most common abnormal pattern of luteal activity observed. Cows with a C-LA earlier than 45 days postpartum had higher (P ≤ 0.05) mean serum concentrations of IGF-I than those with later C-LA. In addition, cows which showed C-LA earlier than 45 days postpartum had more optimal productive indices including shorter calving to conception interval and calving to first service interval (P ≤ 0.05), and fewer services per conception (P = 0.07). C-LA was significantly later in cows that lost more than 0.5 BCS units within 3 weeks postpartum than in those that lost less than 0.5 units BCS during the same interval (P = 0.02). We conclude that high-producing dairy cows with higher postpartum serum IGF-I concentrations have earlier commencement and normal luteal activity, and better reproductive performance. Severity and duration of BCS loss adversely affect commencement of luteal activity.
机译：研究了产后奶牛的身体状况评分（BCS），产奶量，血清胰岛素样生长因子-I（IGF-I）和黄体活性之间的关系。从产后的第一周到第八周，每周对两次健康的高产多头荷斯坦奶牛进行经直肠超声扫描，共71例。每周两次收集血样以测量血清孕酮（P4），每两周收集一次血样以检测血清IGF-I浓度。产犊后每周监测一次BCS。在至少两次连续采样中，血清P4浓度≥1ng / ml的母牛被认为已开始黄体活动。在产后45天之前，观察到黄体活性（C-LA）的开始在母牛中的占71.8％，而在产后45天，有28.2％的患者显示出黄体活性的开始。黄体期延长是最常见的黄体活动异常模式。产后45天之前患有C-LA的母牛比后期C-LA的母牛具有更高的IGF-I平均血清浓度（P≤0.05）。此外，产后45天之前出现C-LA的母牛具有更好的最佳生产指数，包括产犊间隔短和产仔间隔缩短（P≤0.05），每胎受胎次数更少（P = 0.07）。与相同时间间隔内BCS少于0.5个单位的母牛相比，产后3周内BCS少于0.5个单位的母牛的C-LA显着晚（P = 0.02）。我们得出的结论是，产后血清IGF-I浓度较高的高产奶牛具有更早的开始和正常的黄体活动，以及更好的生殖性能。 BCS丧失的严重程度和持续时间会对黄体活动的开始产生不利影响。

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