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Reduced progesterone concentration during growth of the first follicular wave affects embryo quality but has no effect on embryo survival post transfer in lactating dairy cows.
Fertility of lactating dairy cows is associated with reduced progesterone (P(4)) concentration compared with nonlactating animals. The objective of the current study was to determine whether P(4)… Expand
Resynchronization strategies to improve fertility in lactating dairy cows utilizing a presynchronization injection of GnRH or supplemental progesterone: I. Pregnancy rates and ovarian responses.
Objectives were to evaluate 3 resynchronization protocols for lactating dairy cows. At 32+/-3 d after pre-enrollment artificial insemination (AI; study d -7), 1 wk before pregnancy diagnosis, cows… Expand
Minimal progesterone concentration required for embryo survival after embryo transfer in lactating Holstein cows.
- A. G. Kenyon, L. Mendonça, G. Lopes, J. R. Lima, J. Santos, R. Chebel
- Animal reproduction science
- 30 January 2013
Objectives were to determine progesterone concentration (P4) from days 4 to 28 relative to presumptive estrus necessary for maintenance of pregnancy in lactating Holstein cows. Cows were assigned to… Expand
Evaluation of presynchronized resynchronization protocols for lactating dairy cows.
- R. Chebel, A. Scanavez, P. B. Silva, J.G.N. Moraes, L. Mendonça, G. Lopes
- Journal of dairy science
- 1 February 2013
The objectives of this experiment were to determine the speed at which cows that had their estrous cycle presynchronized with a GnRH or PGF(2α) injection are reinseminated and become pregnant.… Expand
Yeast product supplementation modulated feeding behavior and metabolism in transition dairy cows.
Yeast supplementation has been shown to increase feed intake and production in some studies with early lactation dairy cows, but the mechanisms underlying such an effect remain unknown. The objective… Expand
Low progesterone concentration during the development of the first follicular wave reduces pregnancy per insemination of lactating dairy cows.
Objectives were to determine the effect of progesterone (P4) concentration on fertility of lactating dairy cows induced to ovulate follicles of the first follicular wave. Lactating dairy cows (n=989)… Expand
Effects of resynchronization strategies for lactating Holstein cows on pattern of reinsemination, fertility, and economic outcome.
The objectives were to evaluate the pattern of re-insemination, pregnancy outcomes to re-insemination in estrus and at fixed time, and economic outcomes of lactating Holstein cows submitted to three… Expand
Dose frequency of prostaglandin F2α administration to dairy cows exposed to presynchronization and either 5- or 7-day Ovsynch program durations: Ovulatory and luteolytic risks.
We hypothesized (1) that neither duration of the Ovsynch program nor dose frequency of PGF2α would change the proportion of cows with complete luteolysis (progesterone <0.4 ng/mL 72 h after PGF2α)… Expand
Comparison of peripartum metabolic status and postpartum health of Holstein and Montbéliarde-sired crossbred dairy cows.
- L. Mendonça, C. C. Abade, +4 authors R. Chebel
- Biology, Medicine
- Journal of dairy science
- 1 February 2014
Objectives of the current experiment were to evaluate plasma concentrations of metabolites and haptoglobin peripartum, uterine health and involution, and follicle growth and resumption of cyclicity… Expand
Yeast product supplementation modulated humoral and mucosal immunity and uterine inflammatory signals in transition dairy cows.
The transition from late gestation to early lactation is characterized by substantial metabolic stress and altered immune function. The objective of this study was to assess the effects of… Expand