Search National Agricultural Library Digital Collections

NALDC Record Details:

Effects of maternal nutrient restriction followed by realimentation during midgestation on uterine blood flow in beef cows

Permanent URL:
http://handle.nal.usda.gov/10113/58732
File:
Download [PDF File]
Abstract:
The objective was to examine the effect of maternal nutrient restriction followed by realimentation during mid-gestation on uterine blood flow (BF). On Day 30 of pregnancy, lactating, multiparous Simmental beef cows were assigned randomly to treatments: control (CON; 100% National Research Council; n = 6) and nutrient restriction (RES; 60% of CON; n= 4) from Day 30 to 140 (Period 1) and, thereafter, realimented to CON until Day 198 of gestation (Period 2). Uterine BF, pulsatility index (PI), and resistance index (RI) were obtained from both the ipsilateral and contralateral uterine arteries via Doppler ultrasonography. Generalized least squares analysis was performed. Ipsilateral uterine BF in both groups increased quadratically (P < 0.01) during period 1 and linearly (P < 0.01) during period 2. There was a treatment (P = 0.05) effect during period 2; where RES cows had greater ipsilateral BF versus CON. Ipsilateral uterine PI and RI decreased linearly (P ≤ 0.01) during period 1 across treatments. Contralateral uterine BF in CON cows tended (P < 0.09) to be greater versus RES in both periods. Contralateral PI in both groups increased linearly (P ≤ 0.01) during period 1. Contralateral uterine RI was increased (P ≤ 0.05) in RES cows versus CON in both periods. There was no interaction or treatment effect (P ≥ 0.24) for total BF during either period. Nutrient restriction does not alter total uterine BF, but it may increase vascular resistance. However, upon realimentation, local conceptus-derived vasoactive factors appear to influence ipsilateral uterine BF.
Author(s):
L. E. Camacho , C. O. Lemley , L. D. Prezotto , M. L. Bauer , H. C. Freetly , K. C. Swanson , K A. Vonnahme
Subject(s):
Simmental , arteries , beef cows , blood flow , conceptus , lactation , least squares , maternal effect , pregnancy , repletion , restricted feeding , ultrasonography
Note:
USDA Scientist Submission
Source:
Theriogenology 2014 2 v.81
Language:
English
Year:
2014
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.