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Type of publication: Journal Article
Type of document: Full Paper

Year: 2016

Authors: Nagel, C; Aurich, J; Trenk, L; Ille, N; Drillich, M; Pohl, W; Aurich, C

Title: Stress response and cardiac activity of term and preterm calves in the perinatal period.

Source: Theriogenology. 2016; 86(6):1498-1505

Authors Vetmeduni Vienna:

Aurich Christine
Aurich Joerg
Drillich Marc
Ille Natascha
Nagel Christina
Pohl Werner
Trenk Lisa

Vetmed Research Units
University Clinic for Ruminants, Clinical Unit of Herd Management in ruminants
University Clinic for Small Animals, Clinical Unit of Obstetrics, Gynaecology and Andrology
Insemination and Embryotransfer Platform

Project(s): Elektrokardiographisches Trächtigkeitsmonitoring beim Rind

This study tested the hypothesis of gestational age affecting fetal cardiac activity and the stress response at birth. Heart rate (HR), heart rate variability variables, SD of the beat-to-beat interval and root mean square of successive beat-to-beat differences, and postnatal salivary cortisol concentration were studied in calves born at term (Term, n = 7, gestation length 286.3 ± 2.1 days) or after induction of parturition (Preterm, n = 7, gestation length 279.6 ± 0.2 days). Observation periods covered the last month of gestation (phase A), the last hours before birth including the first stage of labor (phase B), and the neonatal period (phase C). Fetal HR decreased in phase A (P < 0.001) and did not differ between groups. During phase B, HR increased (P < 0.05) and was higher in Preterm than in Term calves in phases B (P < 0.05) and C (P < 0.01). In Term calves, heart rate variability increased from Day 6 until birth (P < 0.05). At birth, SD of the beat-to-beat interval was higher in Term than in Preterm calves (P < 0.01). On Day 1 after birth (phase C), HR accelerations were more frequent in Term than Preterm calves (P < 0.01), whereas decelerations were more frequent in Preterm calves (P < 0.05). Cortisol concentration increased postnatally (P < 0.001) and was correlated with gestation length (r ≥ 0.68, P < 0.01). Because of a certain degree of immaturity, the ability to cope with the stress of birth may be impaired in calves born 1 week before term.

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