Ovulation, ovarian function, and reproductive performance after treatments with GnRH in postpartum suckled cows

Fonseca, Francisco Aloizio; Britt, J.H.; Kosugiyama, Motoaki; Ritchie, H. D.; Dillard, E.U.

doi:10.1016/0093-691x(80)90126-0

Cited by 22 publications

(7 citation statements)

References 14 publications

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“…However, the current results clearly show that the first dominant follicle identified can ovulate following a single injection of the GnRH analogue. Previous work showed that GnRH treatment of postpartum beef cows results in a vari¬ able ovulatory response with 10-80% of treated cows ovulating after GnRH administration by single, multiple or pulsatile injec¬ tions (Fonseca et al, 1979;Mawhinney et al, 1979;Riley et al, 1981;Walters et al, 1982;Edwards et al, 1983). In those studies, however, the follicular status at the time of GnRH administration was not known and this, together with various nutritional states, probably accounted for the poor and variable ovulatory responses obtained.…”

Section: Discussionmentioning

confidence: 74%

Induced ovulation of the first postpartum dominant follicle in beef suckler cows using a GnRH analogue

Crowe¹,

Goulding²,

Baguisi³

et al. 1993

Reproduction

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There is a low incidence of ovulation of the first dominant follicle that develops in the early postpartum period of beef suckler cows, which prolongs the interval from calving to first ovulation. The objective of this study was to determine whether a single injection of a GnRH analogue would ovulate the first postpartum dominant follicle. Limousin x Friesian beef suckler cows were assigned at parturition, over two years (16 cows in year 1; 19 cows in year 2), to one of three treatments: (1) untreated (control; n = 12), (2) GnRH analogue (20 micrograms buserelin i.m.) administered in the growing-plateau phase of the first postpartum dominant follicle (GnRH-G; n = 12) and (3) GnRH analogue administered in the declining phase of the first postpartum dominant follicle (GnRH-D; n = 11). From day 8 or 9 post partum, the ovaries of each cow were examined daily by ultrasound to determine the time of GnRH injection and ovulation. Blood samples were collected daily for progesterone measurement to confirm ovulation and in year 2 to determine the duration of the first oestrous cycle. The mean (+/- SEM) number of days from parturition to development of the first dominant follicle was 11.0 +/- 0.3, 10.3 +/- 0.5 and 10.1 +/- 0.7 for cows assigned to treatments 1-3, respectively (P > 0.05). The proportion of cows ovulating the first dominant follicle was higher (P < 0.05) following GnRH treatment (12 of 12 and 7 of 10; GnRH-G and GnRH-D, respectively) than with controls (2 of 12).(ABSTRACT TRUNCATED AT 250 WORDS)

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Section: Discussionmentioning

confidence: 74%

Induced ovulation of the first postpartum dominant follicle in beef suckler cows using a GnRH analogue

Crowe¹,

Goulding²,

Baguisi³

et al. 1993

Reproduction

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“…They diminish slowly during the final 3-4 weeks and rapidly 2-3 days before calving (Short, 1958 ;Randel and Erb, 1971 ;Smith et al, 1973 (Webb et al, 1977 ;Lishman et al, 1979 ;Kesler et al, 1980 ;Fonseca et al, 1980 ;Sheffel et al, 1980 ;Troxel et al, 1983) or after early weaning (Odde et al, 1980) or limited suckling with (Dunn et al, 1985) or without (Flood et al, 1979) GnRH injection. Many hypotheses have been put forward to explain this.…”

Section: Progesteronementioning

confidence: 99%

“…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, 1982Jainudeen et al, /1983Montgomery et al, 1985).…”

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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“…Center-East, USDA, Beltsville, MD 20705 Received March 5, 1985. Accepted December 17, 1985 Godines et al, 1981) or during limited suckling (Randel and Walker, 1976), and are induced by treatment with gonadotropin-releasing hormone (GnRH) or human chorionic gonadotropin (hCG) (Britt et al, 1974;Lishman et al, 1979;Carter et al, 1980;Fonseca et al, 1980;Kesler et al, 1980;Pratt et al, 1982). Ramirez-Godinez et al (1982a) have shown that these corpora lutea in early weaned cows are associated with a potentially fertile ovulation, but pregnancy was not maintained due to early regression of the corpus luteum.…”

Section: Introductionmentioning

confidence: 99%

Endocrine Profiles Associated with Life Span of Induced Corpora Lutea in Postpartum Beef Cows

Garcia-Winder

Lewis

Deaver

et al. 1986

Journal of Animal Science

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Two experiments were designed to examine whether hormonal profiles were related to luteal life span in pluriparous postpartum anestrous beef cows. Cows (Exp. 1, n = 34; Exp. 2, n = 23) received norgestomet (N) for 9 d or served as controls (C). Each cow received 1,000 IU human chorionic gonadotropin (hCG) 48 h after removal of N (d 0). Blood samples collected every 15 min for 8 h on d -5, 3 and 5 (Exp. 1) or on d -10 and -1 (Exp. 2) were assayed for luteinizing hormone (LH) and follicle stimulating hormone (FSH). Cortisol was determined in hourly samples collected on d -5 and in samples collected every 2 min during suckling on the same day (Exp. 1). Concentrations of 15-keto-13,14-dihydro-PGF2 alpha (PGFM) were determined in samples collected at 15-min intervals for 2 h on d -5, 3, 5 and 10 (Exp. 1). Estradiol-17 beta was measured in samples collected on d -5 (Exp. 1) or on d -10 and -1 (Exp. 2). Life span of induced corpora lutea was longer (P less than .05) in N than C cows. Percentages of N cows in which corpora lutea, formed in response to hCG, exhibited a normal life span were 83% on farm 1 and 25% on farm 2 (Exp. 1), and 90% (Exp. 2), compared with 0% in C cows. Concentrations of FSH were not affected by N but were lower (P less than .05) on d -5 in cows on farm 2 (.6 +/- .1 ng/ml) than in cows on farm 1 (.8 +/- .1 ng/ml). On d -5, a treatment X farm interaction (P less than .05) for mean LH was observed and frequency of pulses of LH was higher (P less than .01) in N than C cows (2.7 +/- .4 vs. .8 +/- .8 pulses/8 h). Neither cortisol nor PGFM was affected by N. Estradiol was increased in d -1 (6.1 +/- .5 vs 2.6 +/- .8 pg/ml; P less than .01) by N. It is suggested that pre-treatment with N enhanced life span of induced corpora lutea, in part, by influencing secretion of LH and development of follicles, but a threshold concentration of FSH was required for N to exert this effect.

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Ovulation, ovarian function, and reproductive performance after treatments with GnRH in postpartum suckled cows

Cited by 22 publications

References 14 publications

Induced ovulation of the first postpartum dominant follicle in beef suckler cows using a GnRH analogue

Induced ovulation of the first postpartum dominant follicle in beef suckler cows using a GnRH analogue

Endocrine regulation of postpartum ovarian activity in cattle : a review

Endocrine Profiles Associated with Life Span of Induced Corpora Lutea in Postpartum Beef Cows

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