کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8426570 | 1546053 | 2018 | 43 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of maternal nutrient restriction followed by realimentation during early and mid-gestation in beef cows. II. Placental development, umbilical blood flow, and uterine blood flow responses to diet alterations
ترجمه فارسی عنوان
اثرات محدودیت های مواد مغذی مادران و تحریک آنها در مراحل اولیه و بارداری در گاوهای گوشت گاو. دوم توسعه پلاژنتیک، جریان خون بند ناف و پاسخ جریان خون رحمی به رژیم غذایی تغییرات
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
چکیده انگلیسی
The objectives were to examine the effects of maternal nutrient restriction followed by realimentation during early to mid-gestation on placental development and uterine and umbilical hemodynamics in the beef cow. On day 30 of pregnancy, multiparous, non-lactating beef cows (620.5â¯Â±â¯11.3â¯kg) were assigned to 1 of 2 dietary treatments: control (C; 100% National Research Council [NRC] recommendations; nâ¯=â¯18) and restricted (R; 60% NRC; nâ¯=â¯30). On day 85, cows were slaughtered (C, nâ¯=â¯6; R, nâ¯=â¯6), remained on control (CC; nâ¯=â¯12) and restricted (RR; nâ¯=â¯12), or were realimented to control (RC; nâ¯=â¯11). On day 140, cows were slaughtered (CC, nâ¯=â¯6; RR, nâ¯=â¯6; RC, nâ¯=â¯5), remained on control (CCC, nâ¯=â¯6; RCC, nâ¯=â¯5), or were realimented to control (RRC, nâ¯=â¯6). On day 254, all remaining cows were slaughtered. Heart rate and umbilical and uterine hemodynamics [blood flow, resistance index (RI), and pulsatility index (PI)] were determined via Doppler ultrasonography. As expected umbilical blood flow increased and fetal heart rate decreased as gestation advanced. Umbilical PI in RRC cows was less (Pâ¯=â¯0.01) compared to RCC and CCC. During late gestation, RCC cows had greater (Pâ¯=â¯0.02) ipsilateral and total uterine blood flow vs. CCC and RRC. There was an increase in the number and weight of placentomes from R cows (Pâ¯â¤â¯0.02) compared to C cows (i.e. day 85). There were more placentomes (Pâ¯=â¯0.03) in RR vs. CC and RC cows, but placentome weight was not affected (Pâ¯=â¯0.18) by maternal dietary treatment at day 140. Maternal nutrient restriction during early to mid-gestation increased the weight (by day 85) and number (day 85 and 140) of placentomes, and did not reduce fetal weight compared to control cows. A longer realimentation period may enhance uterine blood flow and individual placentome size during later gestation, which may compensate for reduced nutrients experienced early in gestation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Theriogenology - Volume 116, August 2018, Pages 1-11
Journal: Theriogenology - Volume 116, August 2018, Pages 1-11
نویسندگان
L.E. Camacho, C.O. Lemley, S.T. Dorsam, K.C. Swanson, K.A. Vonnahme,