Plasma progesterone levels during the estrous cycle of Holstein and Brahman cows, Carora type and cross-bred heifers

Díaz, Thais; Manzo, M.; Trocóniz, Juan; Benacchio, N.; Verde, Omar

doi:10.1016/0093-691x(86)90034-8

Cited by 15 publications

(13 citation statements)

References 29 publications

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“…Progesterone (ng/ml) concentration was apparently more in every phase of collection in normal cycling cows and mean values of each attribute in both the groups are comparable with the earlier report of Prasad et al, (1989). The concentration of progesterone was lowest at the day of oestrus in both groups and subsequently it increases to peak at mid-luteal phase and gradually decline to its basal level which is in consonance with the report of Diaz et al, (1986). The lower level of Cu impaired secretion of progresterone and might be the one of the cause of low level of this hormone in repeat breeding cows (Philipo et al, 1987b).…”

Section: Resultssupporting

confidence: 73%

Evaluation of micromineral status and ovarian hormonal profile and their interrelation in normal cyclings and repeat breeding cows

Kalita¹,

Barua²,

Goswami³

et al. 2015

IJAR

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Blood samples from 12 normal cycling and 12 repeat breeding crossbred cows were collected aseptically on different phages of oestrous cycle to elucidate the possible relationship between the trace elements and hormone profile of ovary in normal cycling and repeat breeding cross bred cows. Different trace elements namely Fe, Cu, Zn and Mn were estimated using Atomic Absorption Spectrophometer (AAS) and serum oestradiol 17- and progesterone were estimated using coat-A-count ® RIA kit. Fe, Cu and Mn concentration was observed apparently high and Zn concentration was significantly (P<0.05) high in each phase of collection in normal cycling cows from repeat breeder except mid luteal phase. Oestradiol 17- concentration was significantly (P<0.01) high in normal cycling cows in oestrous and early luteal phase, while no significant variation was observed for progesterone concentration between the same phase of the two groups. A positive significant (P<0.01) correlation was observed between Fe-Zn and Cu-Zn (P<0.05) and oestradiol 17- (P<0.05) in normal cycling cows . In repeat breeding cows Fe and oestradiol 17- and Mn and progresterone was positively significant (P<0.01).

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Section: Resultssupporting

confidence: 73%

Evaluation of micromineral status and ovarian hormonal profile and their interrelation in normal cyclings and repeat breeding cows

Kalita¹,

Barua²,

Goswami³

et al. 2015

IJAR

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“…Receptors for E2 and P4 are highly expressed in the CL in the early luteal phase, which probably stimulates P4 secretion and prevents apoptosis [65]. Serum P4 concentration is near to zero around estrus and high during the luteal phase, with average peak levels ranging from 4.1-9.9 ng/ml [4,17,23,38,71]. A high correlation between CL diameter and P4 output was reported in [58,64,81].…”

Section: Progesteronementioning

confidence: 94%

A simple mathematical model of the bovine estrous cycle: Follicle development and endocrine interactions

Bôer

Stötzel

Röblitz

et al. 2011

Journal of Theoretical Biology

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Bovine fertility is the subject of extensive research in animal sciences, especially because fertility of dairy cows has declined during the last decades. The regulation of estrus is controlled by the complex interplay of various organs and hormones. Mathematical modeling of the bovine estrous cycle could help in understanding the dynamics of this complex biological system. In this paper we present a mechanistic mathematical model of the bovine estrous cycle that includes the processes of follicle and corpus luteum development and the key hormones that interact to control these processes. The model generates successive estrous cycles of 21 days, with three waves of follicle growth per cycle. The model contains 12 differential equations and 54 parameters. Focus in this paper is on development of the model, but also some simulation results are presented, showing that a set of equations and parameters is obtained that describes the system consistent with empirical knowledge. Even though the majority of the mechanisms that are included in the model are based on relations that in literature have only been described qualitatively (i.e. stimulation and inhibition), the output of the model is surprisingly well in line with empirical data. This model of the bovine estrous cycle could be used as a basis for more elaborate models with the ability to study effects of external manipulations and genetic differences. AMS MSC 2000: 92C42, 92C30, 90C31, 65L09

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“…As a rule of thumb, the cyclical standard of the P4 concentrations found in this trial agrees with the changes that occur during the estrous cycle due to the functioning corpus luteum (CL), not only for pregnant recipients but also for open ones. Also, the results of the present and other studies can account for the luteal function by P4 concentration at the peripheral level [1,3,11,12].…”

Section: Discussionmentioning

confidence: 94%

“…Since in the tropics, the endocrine control of the reproduction of embryo recipients has not been well investigated, it is important to study the hormonal profiles involved in the reproduction of the above mentioned racial types to compare them to those reported for cattle under temperate conditions [1][2][3][4].…”

mentioning

confidence: 99%

Reproductive Response of Crossbred Heifers (Bos indicus * Bos taurus) Used as Embryo Recipients in Venezuela.

Roa

Linares

Rolo

et al. 1998

Journal of Reproduction and Development

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Abstract. Plasma Progesterone (P4) concentrations were determined by Enzyme-Linked Immuno absorbent Assay (ELISA) in 47 crossbred recipients (Bos indicus × Bos taurus) in a commercial embryo transfer (ET) program in the savannas of Venezuela. This study was carried out to evaluate the reproductive response of these embryo recipient heifers. Pregnancy status was confirmed by rectal palpation 60 days after estrus. Pregnancy rates were 38.3% (18/47) while a 61.7% stayed open. There were no significant differences between plasma P4 concentration of females that remained pregnant and those that did not either on day 0 (estrus) or 7 (ET). On day 21, the mean concentrations of P4 in pregnant females was 12.2 ng/ml being significantly higher compared to non-pregnant females (0.82 ng/ml). Recipients having plasma P4 concentrations of 2 ng/ml or more on day 21 were considered pregnant. This type of early pregnancy diagnosis using as a discrimination criterion 2 ng/ml of P4 in plasma, had an efficiency of 75% in detecting pregnant recipients and 100% in detecting open heifers correctly, for day 21 post estrus. It was concluded that this type of heifers has a good reproductive response as recipients of embryos in the Venezuelan tropics. Evaluating the concentrations of P4 on day 21 after estrus gave a high percentage of certainty in the early diagnosis of pregnancy. This would allow us to reuse the open recipient for ET before 60 days post estrus, and reduce the cost for maintenance.

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Plasma progesterone levels during the estrous cycle of Holstein and Brahman cows, Carora type and cross-bred heifers

Cited by 15 publications

References 29 publications

Evaluation of micromineral status and ovarian hormonal profile and their interrelation in normal cyclings and repeat breeding cows

Evaluation of micromineral status and ovarian hormonal profile and their interrelation in normal cyclings and repeat breeding cows

A simple mathematical model of the bovine estrous cycle: Follicle development and endocrine interactions

Reproductive Response of Crossbred Heifers (Bos indicus * Bos taurus) Used as Embryo Recipients in Venezuela.

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