Article

Physiological Regulation of Maternal Behavior in Heifers: Roles of Genital Stimulation, Intracerebral Oxytocin Release, and Ovarian Steroids

Department of Animal Science, Iowa State University, Ames, Iowa, United States
Biology of Reproduction (Impact Factor: 3.45). 07/2001; 65(1):295-300. DOI: 10.1095/biolreprod65.1.295
Source: PubMed

ABSTRACT We tested the hypotheses that 1) epidural anesthesia at parturition would block both peripheral and central release of oxytocin and eliminate the development of maternal behavior in primiparous heifers and 2) estradiol priming, genital stimulation, and appropriate neonatal stimuli would induce maternal behavior in nulliparous heifers. In experiment 1, primiparous crossbred heifers (n = 13) with cannulas in the third cerebroventricle (IIIV) were assigned randomly to receive epidural treatments of saline (SAL; n = 6) or lidocaine HCl (EPI; n = 7) at the onset of labor induced between Days 270 and 280 of gestation. Epidural anesthesia blocked (P < 0.001) both central and peripheral release of oxytocin and markedly reduced (P < 0.05) or eliminated licking behaviors during a 3-h period following parturition as compared with SAL. Following approximately 1 wk of controlled daily suckling, during which calves were permitted access only to the inguinal region of their dams (three times daily for 10 min each time), a second maternal behavior test was performed. Although licking behavior remained markedly reduced (P < 0.001) in the EPI compared with the SAL groups, all heifers accepted their calf at the udder. In experiments 2-4, neither estradiol priming in ovariectomized heifers nor estradiol plus progesterone in intact heifers resulted in an induction of maternal behaviors following genital stimulation and presentation of a neonate wetted with amniotic fluid. Pelvic sensory deficits apparently block oxytocin release and disturb both short-latency and long-term maternal behaviors but do not result ultimately in rejection of the calf. Combinations of hormonal, sensory, olfactory, and visual cues observed previously to induce maternal behavior in nulliparous ewes do not appear adequate for induction of maternal behavior in nulliparous heifers.

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    • "Oxytocin is released e.g. during teat stimulation while suckling as well as during vaginocervical stimulation as is the case when giving birth [12] [13]. A relationship between oxytocin levels and maternal and/or bonding behavior has been detected in various species such as cattle [14], sheep [11], rats [15], and primates [16], including humans [17]. We therefore hypothesized that saliva oxytocin levels either alone or in combination with parameters indicative of stress may serve as a biomarker for maternal behavior in cattle. "
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    ABSTRACT: The objectives of the present study were to evaluate the suitability of potential biomarkers for maternal ability in cattle, and in addition to test the hypothesis that dairy cows have a less pronounced motherliness than beef cows. Therefore, maternal behavior of 20 Simmental beef-type (S) and 20 German Black Pied (dairy-type) Cattle (BP) was assessed on the 2nd and again on the 3rd day of the calf's life. Measurements included the frequency of interactions between cow and calf, the cow's willingness to defend her calf, the overall maternal behavior, saliva cortisol, saliva oxytocin, heart rate, and thermal images of the eye (ET). Mixed model analysis revealed that BP had significantly (P<0.05) higher oxytocin (88.6±9.2 vs. 62.8±9.2pg/ml saliva) and cortisol (1.3±0.1 vs. 1.0±0.1ng/ml saliva) levels, but lower heart rates (80.0±2.0 vs. 95.8±2.0bpm) than S cows. Simmental (beef) cows showed more defensive behavior (3.5±0.2 vs. 2.7±0.2 scores), but fewer total interactions between cow and calf (8.1±1.4 vs. 13.8±1.4), compared to BP (dairy). However, with the exception of heart rate and overall maternal behavior, breed differences tended to diminish from the 2nd to the 3rd day of the calf's life. Repeatabilities ranged from 9±23% (ET) to 77±7% (maternal behavior measured on a visual analogue scale), and correlations between physiological parameters and behavior differed between breeds and were generally at a low level. In conclusion, beef cows do not seem to be per se more maternal compared to dairy cows, and the assessed parameters are of limited use as biomarkers for maternal behavior. Copyright © 2014 Elsevier Inc. All rights reserved.
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    • "In experimental animals, it has been shown that oxytocin strongly influences maternal care, and the prosocial effects of oxytocin have been widely recognized (Francis et al., 2000; Williams et al., 2001; Caldwell and Young, 2006). However, the neuroendocrinological research of mother-infant relations in humans is now being progressively undertaken, although it remains unclear how oxytocin links mother-infant relationship and post-growth offspring. "
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    • "Parturition induces physiological changes within several brain areas. OT concentrations are greatly increased in the cerebrospinal fluid of ewes within the first few minutes after expulsion of the neonate (Kendrick et al., 1986) but not in animals that have an epidural anesthesia (Levy et al., 1992; Williams et al., 2001). OT synthesis increases at parturition in the paraventricular nucleus of the hypothalamus (PVN), and in the supraoptic nucleus (SON) of the hypothalamus, two main sources of OT projections in the brain (Broad et al., 1993b). "
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