Prolonged postpartum acyclicity in suckled beef cows is a source of economic loss to beef
cattle producers. Duration of postpartum acyclicity is influenced by suckling status, nutritional …

La presente revisión se realizó con el propósito de analizar y discutir los eventos
neuroendocrinos implicados en el anestro posparto de la oveja. En los mamíferos, durante …

Three groups of ovariectomized Holstein heifers were used in this study. Group I heifers (n=
6) were pretreated with saline (SAL), followed 3 h later by three injections of naloxone …

The endogenous opioid peptides (EOP) comprise a family of neurotransmitters which
profoundly influence reproduction. A major component of their effects is modulation of …

The possible effect of proopiomelanocortin-derived peptide, β-endorphin on frog
gonadotrope cells was investigated. Binding and internalization of β-endorphin to pituitary …

The effects of naloxone (NAL) and/or morphine on gonadotrophin-(GnRH) release in vitro
from the stalk median eminence (SME) of gilts under different conditions were studied. In the …

The effect of the synthetic opioid agonist D-Ala2, N-Me-Phe4, Met (O) 5-ol enkephalin
(DAMME) on plasma growth hormone (GH) and prolactin (PRL) concentrations in Holstein …

Two experiments (Exp) were conducted to examine in vitro the release of gonadotropin
releasing hormone (GnRH) from the hypothalamus after treatment with naloxone (NAL) or …

This experiment was conducted to investigate the effect of naloxone (NAL), an opioid
receptor antagonist, on pituitary LH secretion in anovulatory Holstein cows during the early …

O pós-parto em bovinos é caracterizado como um momento em que as fêmeas bovinas não
ovulam, principalmente devido a uma inadequada liberação de gonadotrofinas. Os …