The effects of ovarian function on estrus synchronization with PGF in dairy cows

Waldmann, A.; Kurykin, J.; Jaakma, Ülle; Kaart, Tanel; Aidnik, Madis; Jalakas, M.; Majas, L.; Padrik, Peeter

doi:10.1016/j.theriogenology.2006.04.030

Cited by 23 publications

(20 citation statements)

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“…(1995) have shown that AST values decrease significantly from 9 and 12 days before ovulation until ovulation, indicating a decreased need for amino acids in gluconeogenesis. In the present study, the AST activity decrease during the 28–42 DAC period coincided with the average number of days to first ovulation (35) as the estimated time interval from ovulation to milk P 4 rise to 5 ng/ml was 6 days in a previous study (Waldmann et al., 2006). However, the AST activity during the period was not related to the duration of the anovulatory interval.…”

Section: Discussionsupporting

confidence: 76%

Field Trial on the Relationship of Blood Metabolites and Body Condition Score with the Recurrence of Luteal Activity in Estonian Holstein Cows

Ling

Waldmann

Samarütel

et al. 2007

Journal of Veterinary Medicine Series A

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Associations of body condition scores and blood metabolites, measured before calving and at different periods during early lactation, with recurrence of luteal activity were investigated in a 250-head commercial dairy farm during a 4-year period (1999-2002). The study was conducted on 48 dairy cows (60 lactations) with average 305-day milk yield of 8149 kg per cow. Blood samples taken 1-14 days before calving and 1-14, 28-42 and 63-77 days after calving were analysed for aspartate aminotransferase, glucose, ketone bodies, triglycerides, non-esterified fatty acids and cholesterol. Milk progesterone (P(4)) profiles (samples collected twice a week, P(4) levels measured in whole milk by enzyme immunoassay) were used to evaluate the interval from calving to first luteal response, P(4) >5 ng/ml, and the interval from calving to first normal cycle. The MIXED procedure of the sas system was used to study the association of investigated parameters. A higher concentration of ketone bodies before calving was associated with shorter interval to recurrence of first normal cycle (P = 0.007) and tended to be related to shorter interval from calving to first luteal response (P = 0.071). A lower prepartum aminotransferase activity showed a tendency to be associated with shorter interval from calving to first luteal response (P = 0.084). Results suggest metabolic status up to 2 weeks prepartum to be related to the resumption of postpartum luteal activity in Estonian Holstein dairy cows.

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Section: Discussionsupporting

confidence: 76%

Field Trial on the Relationship of Blood Metabolites and Body Condition Score with the Recurrence of Luteal Activity in Estonian Holstein Cows

Ling

Waldmann

Samarütel

et al. 2007

Journal of Veterinary Medicine Series A

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“…As explained by Meyer et al [5], two successive PGF 2α analogue treatments mediate luteolysis, align the animals into the oestrous cycle, resulting in a marked decline in P4 concentrations, which allows the LH surge that precedes ovulation [22]. In agreement with previous findings [20,21], 9 of 10 cows in the current study showed a rapid decline in P4 concentrations to values < 2.5 ng/ mL within 24 h of PGF 2α analogue treatment, indicating complete luteolysis. One cow had milk P4 concentrations indicating incomplete luteolysis yet ovulated within the observed range.…”

Section: Discussionsupporting

confidence: 91%

“…Concentrations of P4 in milk were measured by an enzyme immunoassay [18,19]. The occurrence of complete luteolysis was detected by measurements showing P4 concentrations < 2.5 ng/mL, as defined earlier [20]. However, one cow had P4 concentrations compatible with incomplete luteolysis, i.e.…”

Section: Progesterone In Milkmentioning

confidence: 99%

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Ovarian follicular response to oestrous synchronisation and induction of ovulation in Norwegian Red cattle

et al. 2020

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Background: Oestrous synchronisation of cattle has been widely applied to accomplish simultaneous ovulation in animals and facilitate timed artificial insemination. The main aim of this study was to investigate the ovarian follicular growth and ovulatory response to oestrus and ovulation synchronisation in Norwegian Red heifers and cows. Oestrous cycles in 34 heifers and 10 cows from 4 herds were synchronised with two PGF 2α analogue treatments 11 days apart, followed by GnRH analogue treatment for induction of ovulation. Thereafter, the ovaries were examined by ultrasonography at 3 h intervals until ovulation. Results: The luteolytic effect of the PGF 2α analogue was verified in 9 of 10 cows by progesterone contents in milk. Maximum physical activity of the cows occurred on average 69 h after PGF 2α analogue treatment. An ovulatory response was recorded in 95.5% (42/44) of the animals. A significant difference in follicle size at ovulation was found between 2 of the herds. Animals with medium sized and large follicles and heifers aged > 16 months ovulated earlier than other animals. Conclusions: The applied sequence of treatments in the study was shown to be effective in synchronizing and inducing ovulation within a relatively narrow time interval in the Norwegian Red heifers and cows, consistent with findings in other cattle breeds.

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“…Higher ovulation incidence of over 90% to the second GnRH treatment in Ovsynch (Cordoba & Fricke 2001;Gumen et al 2003) is reported in other studies using Holstein cows. The failure of luteolysis following PG treatment may have been due to cows with an ovarian dysfunction (Opsomer et al 1998) or being in an early stage of the estrous cycle when the CL is less responsive (Waldmann et al 2006). Diagnosis of the presence of CL at some time point does not, however, ensure that the subsequent ovulation is followed by a luteal phase of normal length or a normal conception rate.…”

Section: Resultsmentioning

confidence: 99%

Comparative efficacy of the synchrony programmes in subestrus crossbred cows at smallholder farms in Bangladesh

Kamal

Opsomer

Parveen

et al. 2013

Journal of Applied Animal Research

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The objective was to compare the reproductive efficacy of a Cosynch (GnRH-PGF 2a ( GnRH 'TAI), PG programme (one shot PGF 2a ) with artificial insemination (AI) on observed estrus and untreated control (AI on observed estrus) in subestrus (cycling but not detected in estrus by ]60 days postpartum) crossbred cows at smallholder farms. Ultrasonographic examinations were performed at AI, 7 d after AI and 28 d and 42 d after AI to determine the largest follicle, the new corpus luteum (CL) and to diagnose conception and pregnancy, respectively. Of the 69 enrollments in the estrus detection groups, 78.9% in PG programme and 54.8% in control were detected in estrus during the following two weeks (x2 04.57; P 00.04). Of the inseminated cows in all groups, 75.7% in Cosynch, 76.7% in PG programme and 82.4% in control were ovulated (x2 0 0.31; P 00.86). The size of the largest follicle at AI had a positive correlation with the resultant CL at d 7 (r 00.84, P00.001). The follicle in cows that subsequently became pregnant was larger (P00.01) than that in the non-pregnant cows (15.892.03 vs. 14.692.31), and this was smaller (P 00.001) in cows that experienced late embryonic mortality (12.391.03) than that with successfully maintained pregnancy (15.892.03) or have not conceived (15.692.67). In cows with an expected synchronisation response, the largest follicle size did not differ (P00.18) between cows that subsequently became pregnant or non-pregnant. The conception rates (Cosynch: 54.1%; PG programme: 63.3%; Control: 64.7%) were not different between the groups (x2 0 0.83; P00.37). The embryonic mortality was 12% in the cows during d 28 until d 42. The overall final pregnancy rate was 41.5% that did not differ (x2 0 1.56; P00.64) between the groups (Cosynch: 45.9%; PG programme: 44.7%; Control: 32.3%). Therefore, selective administration of PGF 2a to subestrus cows would be economically advantageous because of a saving in hormone injection costs, and veterinary supervision can lead to an increase in the estrus detection efficiency of the herd personnel.

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The effects of ovarian function on estrus synchronization with PGF in dairy cows

Cited by 23 publications

References 51 publications

Field Trial on the Relationship of Blood Metabolites and Body Condition Score with the Recurrence of Luteal Activity in Estonian Holstein Cows

Field Trial on the Relationship of Blood Metabolites and Body Condition Score with the Recurrence of Luteal Activity in Estonian Holstein Cows

Ovarian follicular response to oestrous synchronisation and induction of ovulation in Norwegian Red cattle

Comparative efficacy of the synchrony programmes in subestrus crossbred cows at smallholder farms in Bangladesh

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