Effect of progesterone on the expression of estrus at the first postpartum ovulation in dairy cattle

Fifty-two lactating Holstein cows were randomly assigned to receive either a progesterone-releasing (2 g of progesterone) or a control-releasing intravaginal device (0 g of progesterone). Intravaginal devices were inserted on d 10 and removed on d 15 postpartum. Daily blood samples were collected fr...

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Bibliographic Details
Published in:Journal of dairy science 1992-06, Vol.75 (6), p.1456-1460
Main Authors: Kyle, S.D. (Elkhart Co. 4-H Fairgrounds, Goshen, IN), Callahan, C.J, Allrich, R.A
Format: Article
Language:English
Subjects:
Administration, Intravaginal
Animals
Biological and medical sciences
Cattle - physiology
CICLO ESTRAL
CYCLE OESTRAL
Delayed-Action Preparations
DURACION
DUREE
Estrus - drug effects
Female
Food industries
Fundamental and applied biological sciences. Psychology
Lactation - drug effects
Milk and cheese industries. Ice creams
OVULACION
OVULATION
Ovulation - physiology
Postpartum Period - drug effects
Postpartum Period - physiology
PROGESTERONA
PROGESTERONE
Progesterone - administration & dosage
Progesterone - blood
Progesterone - pharmacology
PUERPERIO
PUERPERIUM
Random Allocation
RENDEMENT LAITIER
RENDIMIENTO LECHERO
SERUM SANGUIN
SUERO SANGUINEO
VACAS LECHERAS
VACHE LAITIERE
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Summary:Fifty-two lactating Holstein cows were randomly assigned to receive either a progesterone-releasing (2 g of progesterone) or a control-releasing intravaginal device (0 g of progesterone). Intravaginal devices were inserted on d 10 and removed on d 15 postpartum. Daily blood samples were collected from d 10 to 90 postpartum for subsequent determination of progesterone concentrations. Observations for estrus were conducted three times daily in a dirt paddock containing a testosterone-treated cow. Serum concentrations of progesterone in the progesterone-releasing intravaginal device group were elevated on d 11, 12, 13, 14, and 15 compared with those of the control group. The days to first postpartum ovulation were similar between the treated and control groups, respectively (30.6 vs. 30.5 d). Also similar was the proportion of cows expressing estrus at first, second, and third postpartum ovulations (9/27 vs. 3/24, 14/23 vs. 15/21, and 14/21 vs. 9/15, respectively), length of the first postpartum estrous cycle (17.9 vs. 18.3 d), and peak serum concentrations of progesterone during the first estrous cycle (3.5 vs. 2.9 ng/ml). These data indicate that administration of progesterone early postpartum did not increase the proportion of cows expressing estrus at the first ovulation
ISSN:0022-0302
1525-3198
DOI:10.3168/jds.s0022-0302(92)77901-6