Relationships between the incidence of pre-ovulatory behaviour and the concentrations of oestradiol-17β and progesterone in bovine plasma

Glencross, R.G.; Esslemont, R. J.; Bryant, M. J.; Pope, G. S.

doi:10.1016/0304-3762(81)90092-4

Cited by 47 publications

(15 citation statements)

References 13 publications

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“…Serum luteinizing hormone (LH) levels, which are known to be low during this pre-pubertal period in cattle (Gonzalez-Padilla et al, 1975), rise rapidly after ovariectomy (Kiser, Kraeling, Rampacek, Landmeier, Caudle and Chapman, 1981) but are depressed after administration of oestradiol-17P (Schillo, Dierschke and Hauser, 1982). It is likely therefore that the plasma concentrations of oestradiol-17P measured in the present study exert a negative feedback action on pituitary LH secretion, thereby preventing the final maturation of ovarian follicles and secretion of oestradiol-17|3 at the high levels typical of oestrus and the preovulatory period (Glencross, Esslemont, Bryant and Pope, 1981). Such a mechanism has been proposed for pre-pubertal sheep (Karsch and Foster, 1981).…”

Section: Therementioning

confidence: 71%

A note on the concentrations of plasma oestradiol-17β and progesterone around the time of puberty in heifers

Glencross¹

1984

Anim. Sci.

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In heifers, plasma progesterone levels were low (<0-3 |xg/l) from the 59th to about the 15th day before puberty (defined as the day when oestrus was first detectable by the fern pattern of dried cervical mucus). Plasma oestradiol-17P levels varied randomly within the range 1 to 4 ng/1 over the same period, but then showed three peaks of about 6, 9 and 4 ng/1, respectively 8 days before puberty, on the day of puberty and 4 days later. The pre-pubertal oestradiol-17p peak was followed by a short period of elevated progesterone levels. Whether this oestradiol-17P peak induced ovulation is uncertain; it is however clear that a corpus luteum of normal life-span was not formed. The oestradiol-17p peaks on the day of puberty and 4 days later, when progesterone levels were rising rapidly, were typical both in magnitude and duration of those occurring before and after ovulation in post-pubertal oestrous cycles.

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Section: Therementioning

confidence: 71%

A note on the concentrations of plasma oestradiol-17β and progesterone around the time of puberty in heifers

Glencross¹

1984

Anim. Sci.

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“…Several other studies have found no relationship between oestradiol and behavioural signs of oestrus (e.g. incidence of standing or mounting activities, chin resting or sniffing) suggesting that there may be individual oestradiol threshold values for each animal, above which oestrous behaviours are induced (Glencross et al. 1981; Cook et al.…”

Section: Discussionmentioning

confidence: 98%

The Effect of a Chronic Stressor, Lameness, on Detailed Sexual Behaviour and Hormonal Profiles in Milk and Plasma of Dairy Cattle

Walker

Smith

Jones

et al. 2010

Reprod Domestic Animals

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The objectives of the present study were to quantify the effects of a biological chronic stressor (lameness) on the duration and frequency of different oestrous behaviours in parallel with milk hormone profiles. Dairy cows 51.8 +/- 1.4 days postpartum (n = 59), including 18 non-lame control cows, were scored for lameness and closely observed for signs of oestrus having had their follicular phases synchronized by administration of gonadotrophin-releasing-hormone (GnRH) followed by prostaglandin F(2alpha) (PG) 7 days later. Lameness shortened the period when herd-mates attempted to mount the lame cows (1.83 +/- 0.69 h vs 5.20 +/- 1.53 h; p = 0.042) but did not affect the overall duration of total behaviours (lame 12.3 +/- 1.3 h vs non-lame 15.2 +/- 1.3 h). Lameness also lowered the intensity of oestrus [1417 +/- 206 points (n = 18) vs 2260 +/- 307 points (n = 15); p = 0.029]. Throughout the synchronized oestrous period, lame cows mounted the rear of herd-mates less frequently (p = 0.020) and tended to chin rest less (p = 0.075). Around the period of maximum oestrous intensity, lameness also diminished the proportion of cows mounting the rear of another cow and chin resting (p = 0.048, p = 0.037, respectively). Furthermore, lame cows had lower progesterone values during the 6 days before oestrous (p < or = 0.05). Fewer lame cows were observed in oestrus following PG (non-lame 83%, lame 53%; p = 0.030); however, if prior progesterone concentrations were elevated, lame cows were just as likely to be observed in oestrus. In conclusion, following endogenous progesterone exposure, lameness shortens the period when herd-mates attempt to mount lame cows but does not affect the incidence of oestrous. However, lame cows are mounted less frequently and express oestrus of lower intensity. This is associated with lower progesterone prior to oestrus but not with abnormal oestradiol or cortisol profiles in daily milk samples.

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“…In contrast, in this study, the RB cows that had higher circulating E 2 exhibited higher estrus intensity, but similar estrus duration to the CTRL cows. Some other reports, however, suggested a threshold level rather than circulating concentrations of E 2 to trigger 'complete' estrus, and that the increasing E 2 concentration increased neither the duration nor the intensity of estrus (Glencross et al 1981, Cook et al 1986, Coe & Allrich 1989, Allrich 1994. Furthermore, variation in estrus characteristics at an individual or herd level cannot be precluded (Bertilsson et al 1998).…”

Section: Hormones and Behavioral Estrus Intensitymentioning

confidence: 98%

Behavioral and hormonal pattern of repeat breeder cows around estrus

et al. 2015

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Repeat breeder (RB) cows were compared with normal (CTRL) ones with respect to behavioral estrus intensity, endocrine patterns and concentrations of plasma estradiol, progesterone and LH around estrus, and ovulation timing. A total of 27 and 31 cycles in 12 RB and 18 CTRL cows, respectively, were synchronized by means of the Ovsynch protocol followed by a single PG injection after 7 days. Behavioral estrus and ovulation were observed in 81.5 and 83.8% of the synchronized cycles in the RB and CTRL cows respectively. The RB and CTRL groups had similar estrus durations of 21.4 and 19.6 h respectively, but estrus was more intense in the RB, as indicated by numerically higher overall activity indexes and higher peak neck activity. The interval from PG injection to estrus onset (considered as proestrus) was 8.2 h shorter in RB than in CTRL cows, at 47.9 and 56.1 h respectively (P!0.007), but the average preovulatory follicle size was similar. The estradiol concentration at peak was numerically higher (21%) and the AUC tended to be higher in the RB cows than in the CTRL cows. LH secretion during the period from 18 to 3 h before the LH peak was also lower in RB than in CTRL cows: 2.5 and 4.6 ng/ml respectively (P!0.01). In conclusion, the behavioral estrus was more intense in the RB cows; nevertheless, short proestrus and subdued LH concentrations before the LH peak, which could impair oocyte competence and development, were first reported in RB cows.

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Relationships between the incidence of pre-ovulatory behaviour and the concentrations of oestradiol-17β and progesterone in bovine plasma

Cited by 47 publications

References 13 publications

A note on the concentrations of plasma oestradiol-17β and progesterone around the time of puberty in heifers

A note on the concentrations of plasma oestradiol-17β and progesterone around the time of puberty in heifers

The Effect of a Chronic Stressor, Lameness, on Detailed Sexual Behaviour and Hormonal Profiles in Milk and Plasma of Dairy Cattle

Behavioral and hormonal pattern of repeat breeder cows around estrus

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