Hormone Levels in Pre- and Post-Parturient Beef Cows

Arije, G. R.; Wiltbank, J. N.; Hopwood, M. L.

doi:10.2527/jas1974.392338x

Cited by 67 publications

(27 citation statements)

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“…However, Arije, Wiltbank and Hopwood (1974) found episodic elevated plasma LH levels after 15 postpartum days ; these results were confirmed by Goodale et al (1978) in a study using hourly sampling over a 10-hour period.…”

Section: Introductionsupporting

confidence: 57%

FSH and LH variations in beef cows during the postpartum period

Gauthier¹,

Blanc²,

Petit³

et al. 1982

Reprod. Nutr. Dévelop.

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Summary. To study the plasma gonadotrophin profiles of 9 cows after parturition, blood samples were obtained every 20 min for 12 hrs on three occasions between 5 and 50 days postpartum and analysed by RIA techniques.The time of the first ovulation, as judged by plasma progesterone levels, varied from 30 to more than 60 days postpartum. Variations in mean levels of FSH and LH were not significantly correlated with the postpartum interval. However, the mean levels of plasma FSH and number of LH pulses were lower in females which had not ovulated than in those which had. The cows could be classified into four groups : group 1 with less than 4 LH pulses in 12 hrs and a mean plasma FSH level < 138 ng/ml ; group 2 with more than 4 LH pulses in 12 hrs and varying plasma FSH levels ; group 3 with less than 4 LH pulses in 12 hrs and a mean plasma FSH level > 138 ng/ml ; group 4 which had ovulated. This classification indicated that the LH and FSH levels progressed significantly (2.46 to 3.56 ng/ml, P < 0.05 ; 120 to 159 ng/ml, P < 0.01, respectively) from groups 1 to 3, and that they decreased in the females which had ovulated (group 4).Since the time of the first ovulation after parturition varied, it was not possible to demonstrate any relationship between that interval and the mean plasma gonadotrophin profiles. However, when ovulation was considered as time zero there was a clear increase in plasma gonadotrophin before ovulation.Introduction.

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Section: Introductionsupporting

confidence: 57%

FSH and LH variations in beef cows during the postpartum period

Gauthier¹,

Blanc²,

Petit³

et al. 1982

Reprod. Nutr. Dévelop.

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“…Estrone and estradiol levels in this study approximate the levels reported by Arije, Wiltbank and Hopwood (1971); Henricks e^ al.…”

Section: Dxms -3 Rturitionsupporting

confidence: 89%

“…In three cows sampled from three to four weeks prepartum through the second postpartum estrus, Arije, Wiltbank and Hopwood (1971) reported corticoids during pregnancy varied from 10 to 50 ng/ml, increasing to 100 ng/ml at parturition. Post partum levels dropped appreciably and showed considerable fluctuation.…”

Section: Corticoidsmentioning

confidence: 98%

“…This decline in the last four days pre partum is not consistent with subsequent total unconjugated estrogen or estrone determinations in other studies. Arije, Wiltbank and Hopwood (1971) reported estrogen in the last 20 days ranged from 870 to 1300 pg/ml and fell to 100 pg/ml at parturition. Henricks et al (1972) Based on a radio immunoassay^ Edqvist et a2.…”

Section: Progesteronementioning

confidence: 99%

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Physio-pathologic studies in induced parturition in the cow (Bos taurus)

Evans¹

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“…Concentrations of oestrogens (17 (1-oestradiol and oestrone) in blood plasma progressively increase toward the end of pregnancy and are at their highest 24-48 hours before calving (Smith et al, 1973 ;Arije et al, 1974 ;Stellflug et al, 1978). Peripheral levels of oestradiol-17a fall after calving and then fluctuate considerably before first ovulation (Pope, 1982).…”

mentioning

confidence: 99%

Endocrine regulation of postpartum ovarian activity in cattle : a review

Hanzen

1986

Reprod. Nutr. Dévelop.

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Summary. The Clinically, the postpartum period is characterized by a period of behavioural anoestrus, the duration of which differs in different breeds.If the detection of oestrus is optimal, anoestrus lasts for 20 to 70 days in dairy cows Callahan et al., 1971 ;Schams et al., 1978 ;Pirchner et al., 1983 ;Richardson et al., 1983 ;Etherington et al., 1984). This period is highly variable in suckled cows and lasts from 30 to 110 days (Wiltbank and Cook 1958 ;Oxenreider 1968 ;Graves et al., 1968 ;Casida et al., 1968 ; Nancarrow et al., 1977 ;Holness et al., 1978 ;Wettemann et a/., 1978 ;Short et al., 1979 ;Dunn and Kaltenbach, 1980 ;Kesler et al., 1980 ;Randel, 1981 ;Montgomery, 1982 ;Peters and Riley, 1982 . Jainudeen et al., 1982Bastidas et al., 1984 ;King and Mc Leod, 1983Leod, /1984Hansen and Hauser, 1984 ;Montgomery et al., 1985).Assay of progesterone in plasma or milk has shown that 88 % of animals of dairy breeds have an luteal activity present by 35 days after calving (Ball and Lamming, 1983) and 95 % within 50 days (Bulman and Lamming, 1978). According to different authors, the first rise of progesterone appears between 16 and 69 days after calving in dairy cows (Webb et al., 1977(Webb et al., , 1980Pirchner et al., 1983) and between 56 and 96 days in suckled cows (Fonseca et al., 1980 ;Peters and Riley 1982 ; Jainudeen et al., 1982 Jainudeen et al., /1983Montgomery et al., 1985).It is possible to detect ovarian follicles by rectal palpation in both milked and suckled cow from the second week after calving (Saiduddin et al., 1968 ;Callahan et al., 1971 ;Kesler et al., 1979 ;Webb et al., 1980 ;Kesler et al., 1980 ;Stevenson et al., 1983 (Wiltbank et al., 1962(Wiltbank et al., , 1964Dunn et al., 1969 ; Lammond, 1970 ;Corah et al., 1975 ;Whitman et a/., 1975 ;Duffour, 1975 ;Holness et al., 1978 ;Carstairs et al., 1980 ;Dunn and Kaltenbach, 1980 ; Gauthier and Thimonnier, 1982 ;Peters and Riley, 1982 ; Mc Leod, 1983/1984 ;Rutter and Randel, 1984). Some authors have found that overfeeding improves ovarian (Wiltbank et al., 1962(Wiltbank et al., , 1964Hansen et al., 1982) or pituitary (Beal et al., 1978 ;Jordan and Swanson, 1979 ;Lishman et al., 1979 ;Moss et al., 1982) function. Others have found no relation between feeding and the ovarian (Lishman et al., 1979 ;Carstairs et al., 1980) or pituitary (Hill et a/., 1970 ;Dunn et al., 1974 ;Spitzer et al., 1978 ;Haresign, 1981 ;Rutter and Randel, 1984) activity.Little is known about the mechanism under which diet exerts its effect. It is conceivable that feeding influences the ovarian response to gonadotropins (Gombe and Hansel, 1973). There was a positive correlation between the degree of fatness of an animal and the plasma concentration of 17 !3-oestradiol, 7 weeks after calving (Lishman et al., 1979).Feeding affects the release of luteinizing hormone (LHI and subsequent luteal function Spitzer et al., 1975 ;Apgar et al., 1975 ;Beal et al., 1978). It has been observed that the release of LH induced by gonadotropin releasing hormone (GnRH) injection was grea...

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Hormone Levels in Pre- and Post-Parturient Beef Cows

Cited by 67 publications

References 0 publications

FSH and LH variations in beef cows during the postpartum period

FSH and LH variations in beef cows during the postpartum period

Physio-pathologic studies in induced parturition in the cow (Bos taurus)

Endocrine regulation of postpartum ovarian activity in cattle : a review

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