Effects of dietary energy level on luteinizing hormone and adrenal function in the post partum beef cow

Effects of dietary energy level on luteinizing hormone and adrenal function in the post partum beef cow

The effects of dietary energy and suckling on adrenal function and luteinizing hormone (LH) concentrations were investigated in primiparous postpartum cows. Ten heifers were assigned at calving to either high (22.8 Mcal/day) or low (15.2 Mcal/day) energy diets. Blood samples were collected every 15...

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Veröffentlicht in:Theriogenology 1991-07, Vol.36 (1), p.107-116
Hauptverfasser: Hall, J.B., Kiser, T.E., Boggs, D.L., Lowery, R.S.
Format: Artikel
Sprache:eng
Schlagworte:
ALLAITEMENT
beef cows
BOVIN DE BOUCHERIE
CATECHOLAMINE
catecholamines
CATECOLAMINAS
cortisol
DIETA
DOPA
DURACION
DUREE
energy
ESTEROIDES
GANADO DE CARNE
GENISSE
LACTANCIA
NORADRENALINE
NOREPINEFRINA
NOVILLA
PESO
PLASMA SANGUIN
PLASMA SANGUINEO
POIDS
postpartum
PUERPERIO
PUERPERIUM
REGIME ALIMENTAIRE
STEROIDE
VACA
VACHE
VALEUR ENERGETIQUE
VALOR ENERGETICO
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Zusammenfassung:The effects of dietary energy and suckling on adrenal function and luteinizing hormone (LH) concentrations were investigated in primiparous postpartum cows. Ten heifers were assigned at calving to either high (22.8 Mcal/day) or low (15.2 Mcal/day) energy diets. Blood samples were collected every 15 minutes for 8 hours on 28, 42, and 56 days post partum. Calves were allowed to suckle ad libitum during sampling periods. Serum samples were analyzed by radioimmunoassay for LH and cortisol. Concentrations of catecholamines were quantified by reverse-phase HPLC. Body weights were decreased (P
ISSN:0093-691X
1879-3231
DOI:10.1016/0093-691X(91)90439-K