| 摘要: |
| 为探究瘤胃保护胆碱（Rumen-protected choline，RPC）和丙二醇（Propyleneglycol，PG）对围产期高产奶牛产奶量和健康状况的影响，选取44头健康的荷斯坦高产奶牛，按胎次、预产期、上一胎次产奶量等基本一致原则分为试验组和对照组，每组22头，饲喂相同基础日粮，所有牛从产前7 d~产后7 d每天晨饲时灌服500 mL/头的PG，且试验组牛群从产前14 d~产后28 d每天晨饲时灌服20 g/头的RPC，试验期为产前14 d~产后28 d。结果显示：1）RPC和PG配合使用对围产期高产奶牛DHI校正奶量无显著影响（P>0.05）；2）RPC和PG配合使用对牛奶中体细胞数有一定的积极影响，减少了17.98%，但组间差异不显著（P>0.05）；3）RPC和PG配合使用对奶牛的疾病状况无影响，两组牛群间酮病、乳房炎、真胃移位、肠炎等疾病均无显著差异（P>0.05）；4）RPC和PG配合使用对血浆中甘油三脂（TG）和β-羟丁酸（BHBA）含量在产犊当天、产后7 d和产后14 d这3个时间点的影响组间差异均不显著（P>0.05）。在本研究条件下，与单独补充PG相比，RPC和PG配合使用对围产期高产奶牛的产奶量和健康状况均无明显的改善作用，因而从经济效益考虑不建议配合使用。 |
| 关键词: 奶牛 瘤胃保护胆碱 丙二醇 围产期 产奶量 健康状况 |
| DOI：10.11841/j.issn.1007-4333.2014.03.22 |
| 投稿时间：2013-08-12 |
| 基金项目:中央高校基本科研业务费专项资金资助（2013QJ071，2013QT034） |
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| Effects of rumen-protected choline and propyleneglycol on milk yield and health status for high productive dairy cows in periparturient |
|
HE Li-wen, MENG Qing-xiang, REN Li-ping
|
| (College of Animal Science and Technology/State Key Laboratory of Animal Nutrition, China Agricultural University, Beijing 100193, China) |
| Abstract: |
| This experiment was conducted to study the effect of rumen-protected choline (RPC) and propyleneglycol (PG) on milk yield and health status for high productive dairy cows in periparturient.Forty-four healthy Holstein cows with similar parity, expected calving date and milk yield were blocked into 22 pairs and then randomly allocated to either one of 2 treatments.Both groups received the same basal diet.All cows were daily drenched with 500 mL of PG from 7 days before the expected calving date till 7 days after calving.Meanwhile, the treatment group were also drenched with 20 g/head of RPC from 14 days before the expected calving date till 28 days after calving.The results showed that supplementing high productive dairy cows in periparturient with RPC and PG had no significant effect on DHI corrected milk yield (P>0.05), while there was some active effect on the somatic cell counts (SCC) by 17.98% decrease without a significant difference (P>0.05), furthermore, there was no effect on disease status with no difference on the incidence of ketosis, mastitis, abomasum displacement and enteritis, etc.(P>0.05) and there was no significant difference (P>0.05) on the content of both plasma triglyceride (TG) and β-hydroxybutyric acid (BHBA) between treatments on the time-point of calving, day 7 postcalving and day 14 postcalving.These results indicate that under the condition of this experiment, compared to supplementing PG alone, RPC and PG supplementation for high productive dairy cows in periparturient has little obviously improving effect on milk yield and health status, thus, considering the economic benefit, it doesn't suggest to have RPC and PG supplementation simultaneously. |
| Key words: cows rumen-protected choline propyleneglycol periparturient milk performance health status |
