摘要
12头初胎荷斯坦乳牛,在预产期前10d、7d、产后3d、10d和17d采取血样,测定血浆中葡萄糖、尿素氮、谷丙转氨酶(GPT)和胆固醇的含量。结果表明:①分娩前第3d和产后第3d、10d、17d的血糖含量分别比预产期前10天显著降低(P<0.01),分别降低26.05%、53.01%、39.87%和75.95%;②尿素氮含量分娩前第3d比预产前第10天降低46.08%(P<0.01),产后3d、10d提高13.43%%和3.85%,产后17天则低11.16%;③预产前3dGPT水平较预产前10d高30.99%(P<0.01),而产后第3d、第17dGPT水平分别较预产前10d低29.11%和25.2%(P<0.01);④血浆总胆固醇在分娩前第3d、产后的第3d和10d分别比预产期前10天低31.35%(P<0.01)、13.41%(P<0.01)和10.40%,而产后第17d的含量较预产前10天提高10.40%。以上结果提示:初胎乳牛围产期的糖、脂肪和蛋白质代谢均发生改变,以促进营养物质的转化和加强蛋白质的合成,适应机体泌乳的生理变化。
Twelve first-fetus cows were used in this study to evaluate the changes of some plasma biochemical parameter before and after parturition in cow.The blood samples were collected via the superior vena cava at 10 day and 3 day before the expected date of childbirth,day 3,day 10 and day 17 after parturition.①From the 10 day of expected date of childbirth to day 17 after parturition,blood sugar was decreased significantly.②The urea-nitrogen level was decreased by 46.08%(P<0.01),compared to control.As it increased by13.43%(P<0.01)and 3.85%at the day 3 and day 10 after parturition,also the day 17 was decreased by 11.16%.③During this phase,the GPT activity at the day 3 a before parturition was increased by 30.99%(P<0.01),whereas it were decreased by 29.11% and 25.2%(P<0.01) at the day 3 and day 17 after parturition,respectively.④Compared with 10 day before expected date of childbirth,the cholesterol levels were decreased by 31.35%(P<0.01),13.41%(P<0.051)and 10.40%(P<0.01) on day 3 before expected date of childbirth and day 3,day 7 after parturition,while it was increased by 10.40% in day 17 after parturition.These results indicate that the blood sugar,cholesterol,urea-nitrogen and GPT activity can change the carbohydrate,lipoid and protein metabolism to adapt the physiological changes of lactation.
出处
《中国奶牛》
北大核心
2004年第1期23-25,共3页
China Dairy Cattle
