Effects of progesterone administered to dairy heifers on sensitivity of corpora lutea to PGF(2)alpha and on plasma LH concentration.

Effects of progesterone administered to dairy heifers on sensitivity of corpora lutea to PGF(2)alpha and on plasma LH concentration. Research Abstract Details 

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Effects of progesterone administered to dairy heifers on sensitivity of corpora lutea to PGF(2)alpha and on plasma LH concentration. Abstract Text:

P J Battista,C E Rexroad,W F Williams,

To determine whether progesterone facilitates PGF(2)alpha-induced luteolysis prior to day 5 of the estrous cycle, 48 Holstein-Friestian heifers were assigned at random to four treatments: 1) 4 ml corn oil/day + 5 ml Tris-HCl buffer (control); 2) 25 mg prostaglandin F(2)alpha (PGF(2)alpha); 3) 100 mg progesterone/day (progesterone); 4) 100 mg progesterone/day + 25 mg PGF(2)alpha (combined treatment). Progesterone was injected subcutaneously daily from estrus (day 0) through day 3. The PGF(2)alpha was injected intramuscularly on day 3. Estrous cycle lengths were decreased by progesterone: 20.2 +/- 0.56, 19.2 +/- 0.31 (control and PGF(2)alpha); 13.2 +/- 1.40, and 11.7 +/- 1.27 (progesterone and combined). The combination of progesterone and PGF(2)alpha did not shorten the cycle any more than did progesterone alone (interaction, P>0.05). PGF(2)alpha treatment reduced progesterone concentrations on day 6 (P<0.05) and both progesterone and PGF(2)alpha reduced plasma progesterone on day 8 (P<0.01 and P<0.05, respectively). LH was measured in blood samples collected at 10- min intervals for 4 hr on day 4 from three heifers selected at random from each of the four treatment groups. Mean LH concentration for control heifers ranged from 0.35 to 0.63 ng/ml (overall mean, 0.49 ng/ml) and for progesterone-treated heifers ranged from 0.12 to 0.30 ng/ml (overall mean, 0.23 ng/ml). LH concentrations were greater in control heifers (P<0.01). The mean LH pulse rate for control heifers was 2.7 pulses/heifers/4 hr, while that for the progesterone-treated heifers was 1.7 pulses/heifer/4 hr. The mean pulse amplitude for control and progesterone treatments was 0.47 ng/ml and 0.36 ng/ml, respectively. Neither pulse amplitude nor frequency were different between treatment groups.

Effects of progesterone administered to dairy heifers on sensitivity of corpora lutea to PGF(2)alpha and on plasma LH concentration. Publishing Authors By Initials

PJ Battista,CE Rexroad,WF Williams,

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Effects of progesterone administered to dairy heifers on sensitivity of corpora lutea to PGF(2)alpha and on plasma LH concentration. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Theriogenology

VOLUME: 22

Page Numbers: 47-58

Journal Abbreviation: Theriogenology

ISSN: 0093-691X

DAY: 26

MONTH: Jul

YEAR: 1984

Effects of progesterone administered to dairy heifers on sensitivity of corpora lutea to PGF(2)alpha and on plasma LH concentration. Information

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LANGUAGE: eng

NlmUniqueID: 421510

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AFFILIATION: USDA, Agricultural Research Center, Beltsville, MD 20705 USA.

Country: United States

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MEDLINETA: Theriogenology

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