Seasonal variations in post-partum plasma progesterone levels and conception in primiparous and multiparous dairy cows

Rosenberg, Miriam; Herz, Z.; Davidson, M.; Folman, Y.

doi:10.1530/jrf.0.0510363

Cited by 98 publications

(33 citation statements)

References 13 publications

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“…Previously pub¬ lished data describing increased progesterone concentrations in the ewe associated with exposure to low temperatures (Lamond et al, 1972;Rhind et al, 1977Rhind et al, , 1978Quirke et ai, 1979;Wheeler & Barnes, 1983) (Stott & Wiersma, 1973;Rosenberg et al, 1977Rosenberg et al, , 1982. Similarly increased progesterone concentrations have been associated with low environmen¬ tal temperatures in sheep (Lamond et ai, 1972;Rhind et ai, 1977;Quirke et ai, 1979;Wheeler & Barnes, 1983), dairy cows (Rosenberg et al, 1982) and Murrah buffalo cows (Rao & Pandy, 1982).…”

Section: Discussionmentioning

confidence: 97%

Effect of cold and hot ambient temperatures on plasma progesterone concentrations in ewes with intact and denervated ovaries containing experimentally maintained corpora lutea

Wheeler¹,

Blackshaw²

1986

Reproduction

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Summary. Twenty ewes in which maintained corpora lutea had been established were subject to 1 of 3 treatments: denervation of the ovaries by freezing, denervation of the ovaries using the chemical 6-hydroxydopamine, or control. The animals were exposed sequentially to normal (24\ m=. \ 5\ s=deg\ C), cold (10\ m=. \ 7\ s=deg\ C), normal (23\ m=. \ 8\ s=deg\ C), hot (39\ m=. \ 4\ s=deg\ C) and normal (24\m=.\6\s=deg\C)temperatures, each for 1 week. On the final 3 days of exposure rectal temperatures and heart rates were measured, and on the final day the body weights, respiratory rates, and blood glucose concentrations were measured and a series of 5 blood samples was collected from each ewe for determination of the progesterone concentrations. The progesterone concentration was greatest during the hot period in 8 of the 12 animals, particularly in the ewes with denervated ovaries (6 of the 7 animals). This suggests that high ambient temperatures increase progesterone concentrations non-specifically, and that denervated ovaries are more sensitive to the circulating catecholamines that presumably mediate this effect. The progesterone concentrations were lower (P < 0\m=.\001) in the groups with freezing or chemically denervated ovaries (2\m=.\86 and 2\m=.\73 ng/ml respectively) than in the control group (3\m=.\38ng/ml), suggesting that the ovarian innervation plays a physiological role in regulating progesterone secretion.

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Section: Discussionmentioning

confidence: 97%

Effect of cold and hot ambient temperatures on plasma progesterone concentrations in ewes with intact and denervated ovaries containing experimentally maintained corpora lutea

Wheeler¹,

Blackshaw²

1986

Reproduction

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“…Deficiencies in luteal function [2,3], either before or after mating, are associated with reduced fertility in beef [4,5] and dairy [6][7][8][9] cattle. In cattle, concentrations of P 4 in plasma 34-48 h prior to the preovulatory surge of LH are greater in cows that conceive compared with cows that fail to conceive [10].…”

Section: Introductionmentioning

confidence: 99%

Increasing Exogenous Progesterone during Synchronization of Estrus Decreases Endogenous 17β-Estradiol and Increases Conception in Cows1

Wehrman

Roberson

Cupp

et al. 1993

Biology of Reproduction

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The objectives of this study were to determine the effects of dose of exogenous progesterone (P4) prior to artificial insemination on concentrations of 17 beta-estradiol (E2) and on conception rates in bovine females. Heifers (n = 100) and cows (n = 100) received P4-releasing intravaginal devices (PRIDs) to produce two different circulating concentrations of P4. All animals received a single PRID 10 days before (Day-10) the start of the breeding season (Day 0). In animals that received the low dose of P4 (1 PRID, target concentration of 2-3 ng/ml of plasma), the original PRID remained in place for 10 days. In animals that received the larger dose of P4 (2 PRIDs, target concentration of 5-8 ng/ml of plasma), an additional PRID was inserted on Day -9. To maintain concentrations of P4 in the 2-PRID group, the PRIDs inserted on Days -10 and -9 were replaced with new PRIDs on Days -5 and -4, respectively. Prostaglandin F2 alpha (25 mg) was administered to all animals on Days -9 and -3 to remove the endogenous source of P4. Following PRID removal, animals were artificially inseminated 12 h after signs of behavioral estrus were observed. A treatment-by-day interaction (p < 0.0001) was observed for concentrations of P4 in circulation of both heifers and cows. Animals that received 2 PRIDs had greater (p < 0.001) concentrations of P4 by Day-8 of treatment than animals that received 1 PRID. In cows that received 1 PRID, concentrations of E2 increased 2.4-fold from Day-10 (6.8 +/- 1.0 pg/ml) to Day-2 (16.7 +/- 1.4 pg/ml).(ABSTRACT TRUNCATED AT 250 WORDS)

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“…Casida (1961) suggested that repeat breeding could be caused by an inadequate supply of progesterone and Rosenberg, Herz, Davidson & Folman (1977) reported that lower conception rates during the summer months in Israel were accompanied by significantly lower progesterone concentrations during the luteal phase ofthe cycle.…”

Section: Introductionmentioning

confidence: 99%

Milk progesterone levels in relation to conception, repeat breeding and factors influencing acyclicity in dairy cows

Bulman¹,

Lamming²

1978

Reproduction

308

122

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Seasonal variations in post-partum plasma progesterone levels and conception in primiparous and multiparous dairy cows

Cited by 98 publications

References 13 publications

Effect of cold and hot ambient temperatures on plasma progesterone concentrations in ewes with intact and denervated ovaries containing experimentally maintained corpora lutea

Effect of cold and hot ambient temperatures on plasma progesterone concentrations in ewes with intact and denervated ovaries containing experimentally maintained corpora lutea

Increasing Exogenous Progesterone during Synchronization of Estrus Decreases Endogenous 17β-Estradiol and Increases Conception in Cows1

Milk progesterone levels in relation to conception, repeat breeding and factors influencing acyclicity in dairy cows

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