Plasma progesterone response following ACTH administration during mid-gestation in the pregnant Brahman heifer

Willard, Scott T.; Lay, D. C.; Friend, T.H.; Neuendorff, D. A.; Randel, R. D.

doi:10.1016/j.theriogenology.2004.05.018

Cited by 5 publications

(5 citation statements)

References 32 publications

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“…The tendency for a month of calving × day effect on progesterone during the 7 d before parturition in Exp. Treatment of heifers with ACTH increased concentrations of progesterone in plasma during gestation (Willard et al, 2005). However, in agreement with Smith et al (1973) and First (1979), progesterone in plasma decreased in all cows during the 7 d before parturition and without a difference between cows that calved in mid-August, late-August, and October.…”

Section: Discussionsupporting

confidence: 78%

Effect of elevated ambient temperature at parturition on duration of gestation, ruminal temperature, and endocrine function of fall-calving beef cows1

Wright

Boehmer

Cooper-Prado

et al. 2014

Journal of Animal Science

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Fall-calving Angus cows were used to evaluate the effect of ambient temperature on duration of gestation. In Exp. 1, cows were AI and calved in August (n = 14) or October (n = 10). Cows grazed native prairie pasture in Oklahoma and had a BCS of 6.0 ± 0.5 (1 = emaciated, and 9 = obese) at parturition. Commencing 2 wk before the expected calving date, blood samples were taken from the coccygeal vein every 2 to 3 d until calving. Cows that calved in August tended to have shorter gestations (P = 0.07) compared with cows that calved in October. Maximum daily ambient temperature during the last 14 d of gestation was greater for August-calving cows (P < 0.001) compared with October cows. Concentrations of cortisol in plasma during the last 4 d of gestation were greater in cows that calved in August (P < 0.04) compared with cows that calved in October. In Exp. 2, cows were AI and calved in either mid-August (n = 7), late-August (n = 6), September (n = 6), or October (n = 8) to evaluate the effects of elevated ambient temperature on duration of gestation, ruminal temperature at parturition, and plasma cortisol, progesterone, and estradiol. Temperature boluses (SmartStock, LLC, Pawnee, OK) programmed to transmit temperature every hour were place in the rumen at 255 d of gestation. Cows grazed native prairie pasture in Oklahoma and had a BCS of 6.5 ± 0.4 at calving. Maximum ambient temperatures during d 263 to 273 of gestation were influenced by month of calving × day (P < 0.001). Duration of gestation was shorter for mid-August cows (P < 0.05) compared with October cows, but did not differ compared with late-August (P = 0.29) and September (P = 0.50) cows. Ruminal temperature during the 4 d before calving was not influenced by month of calving (P = 0.76). Ruminal temperature was decreased during the 24 h before parturition for cows in all months (P < 0.01) compared with 2 to 4 d before parturition. Concentrations of cortisol in plasma during d 271 to 276 of gestation were less (P < 0.05) for late-August compared with cows that calved during the other months. Concentrations of progesterone were greater during 7 d before parturition in October compared with cows that calved in September. Estradiol in plasma of cows during late gestation was not affected by month of calving (P = 0.76). Exposure of beef cows to elevated ambient temperature resulted in shorter gestations. Ruminal temperature in cows decreased ≥ 0.3°C the day before parturition.

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Section: Discussionsupporting

confidence: 78%

Effect of elevated ambient temperature at parturition on duration of gestation, ruminal temperature, and endocrine function of fall-calving beef cows1

Wright

Boehmer

Cooper-Prado

et al. 2014

Journal of Animal Science

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“…This general criterion was established because plasma concentrations of P4 above 1.0 ng/mL are typically restricted to Bos taurus cows and heifers experiencing normal estrous cycles with a functional corpus luteum, which is the major source of P4 in non-pregnant cycling females (Milvae and Hansel, 1983;Patterson et al, 1990;Hoffmann and Schuler, 2002). However, the adrenal gland also is capable of producing significant amounts of P4 in cattle when stimulated by elevated concentrations of circulating ACTH (Willard et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Plasma progesterone concentrations as puberty criteria for Brahman-crossbred heifers

Cooke¹,

Arthington²

2009

Livestock Science

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“…It is known that some cows ovariectomized after 200 days (28 weeks) of pregnancy can maintain their pregnancy (Conley & Ford ; Shemesh ; Willard et al . ). In these cases, progesterone source instead of corpus luteum is considered to be placenta and/or adrenals; however, progesterone supply from these organs is likely to be a subsidiary system when the corpus luteum function is injured.…”

Section: Discussionmentioning

confidence: 97%

“…Although we have reported the positive effects of Se on plasma progesterone concentration in the estrous cycle and the progesterone production of luteal cells (Kamada & Ikumo 1997;Kamada & Hodate 1998), the importance of extra-luteal sources of progesterone in pregnancy has also been reported. It is known that some cows ovariectomized after 200 days (28 weeks) of pregnancy can maintain their pregnancy (Conley & Ford 1987;Shemesh 1990;Willard et al 2005). In these cases, progesterone source instead of corpus luteum is considered to be placenta and/or adrenals; however, progesterone supply from these organs is likely to be a subsidiary system when the corpus luteum function is injured.…”

Section: Discussionmentioning

confidence: 99%

Effects of selenium supplementation on plasma progesterone concentrations in pregnant heifers

Kamada

Nonaka

Takenouchi

et al. 2013

Animal Science Journal

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It is known that selenium (Se) has various functions in animals. Many investigations on the biochemical and physiological effects of Se have been previously reported; however, the detailed function of Se in reproduction is not yet clear. We proposed the possibility that Se plays a notable role in progesterone production. The aim of this study was to clarify the effects of Se supplementation on progesterone levels of pregnant Holstein heifers. Eight Holstein heifers (-Se) were fed basal diet (containing 0.022 ppm of Se) throughout the experiment. While a 0.3 ppm diet of Se (sodium selenite) was fed to another seven animals (+Se) with basal diet. Blood sampling was carried out every week. Plasma Se concentrations were higher in Se-supplemented cows compared with controls (-Se) (P < 0.01) throughout the experiment. Se supplementation increased plasma progesterone in the 29-39 weeks of pregnancy from 4.98 ± 0.64 to 6.86 ± 0.49 ng/mL on average (P < 0.05). The present findings suggest that Se contributes to maintaining the function of the corpus luteum and/or placenta in the latter period of pregnancy.

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Plasma progesterone response following ACTH administration during mid-gestation in the pregnant Brahman heifer

Cited by 5 publications

References 32 publications

Effect of elevated ambient temperature at parturition on duration of gestation, ruminal temperature, and endocrine function of fall-calving beef cows1

Effect of elevated ambient temperature at parturition on duration of gestation, ruminal temperature, and endocrine function of fall-calving beef cows1

Plasma progesterone concentrations as puberty criteria for Brahman-crossbred heifers

Effects of selenium supplementation on plasma progesterone concentrations in pregnant heifers

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