Effect of suckling on cortisol, progesterone and luteinizing hormone in postpartum beef cows.

Effect of suckling on cortisol, progesterone and luteinizing hormone in postpartum beef cows. Research Abstract Details 

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Effect of suckling on cortisol, progesterone and luteinizing hormone in postpartum beef cows. Abstract Text:

S E Dunlap,T E Kiser,G B Rampacek,R R Kraeling,F N Thompson,

Five primiparous, 3-year-old Hereford cows suckled ad libitum , were cannulated via the jugular vein and stanchioned for 2-day sampling periods, every 14 days starting 14 days after the mean calving date. On the second day of each period, calves were removed to a pen away from the cows, for 9 hours. Blood was sampled 5 min before calves were returned to their dams, as soon as possible after initiation of suckling (IOS), and at 15-min intervals for 45 min, thereafter. Cortisol, progesterone and luteinizing hormone (LH) concentrations in the serum were quantitated by radioimmunoassay. Mean serum cortisol concentrations were 7.3 +/- .7, 9.4 +/- .7, 12.1 +/- .9, 7.5 +/- .5 and 5.7 +/- .4 ng/ml (mean +/- S.E.) at -5, 0, 15, 30 and 45 min after IOS, respectively, for all cows across all periods. Cortisol concentrations, during and after suckling, tended (P<.06) to differ among sampling periods, during the postpartum interval. Serum progesterone concentrations were .28 +/- .02, .28 +/- .02, .32 +/- .05 and .24 +/- .03 ng/ml at 0, 15, 30 and 45 min after IOS, respectively, for all cows across all period, indicating that suckling had no effect on serum progesterone, and were similar at all sampling periods during the postpartum interval. Serum LH concentrations were .81 +/- .07, .77 +/- .06, .71 +/- .04, and .72 +/- .04 ng/ml at 0, 15, 30 and 45 min after IOS, respectively. During the postpartum interval, serum LH concentrations were greater (P<.01) at 71 and 85 days postpartum than at any other time.

Effect of suckling on cortisol, progesterone and luteinizing hormone in postpartum beef cows. Publishing Authors By Initials

SE Dunlap,TE Kiser,GB Rampacek,RR Kraeling,FN Thompson,

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Effect of suckling on cortisol, progesterone and luteinizing hormone in postpartum beef cows. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Theriogenology

VOLUME: 16

Page Numbers: 185-93

Journal Abbreviation: Theriogenology

ISSN: 0093-691X

DAY: 26

MONTH: Aug

YEAR: 1981

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LANGUAGE: eng

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AFFILIATION: University of Georgia, Athens 30602 USA; U.S. Department of Agriculture Athens, GA 30613 USA.

Country: United States

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MEDLINETA: Theriogenology

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