Effects of presynchronization and postinsemination treatments on pregnancy rates to a timed breeding Ovsynch protocol in dairy cows and heifers

Gordon, Miriam; Dinn, N.; Rajamahendran, R.

doi:10.4141/cjas09046

Cited by 5 publications

(4 citation statements)

References 25 publications

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“…Larsson and Berglund (2000) found a decrease in the number of AI per conception (1.6 vs 1.9) and a tendency for improved first AI conception rate (56 vs. 49%) between cows bred for a 15-mo and for a traditional 12-mo calving interval (Larsson and Berglund, 2000). Gordon et al (2010) reported that the efficiency of Ovsynch increases if the protocol is initiated between 76 to 105 DIM compared with 60 to 75 DIM. The positive effect of an extension of the VWP on the reproductive efficiency of cows timed inseminated after synchronization is further supported from the results of Stangaferro et al (2018).…”

Section: Discussionmentioning

confidence: 98%

Extended lactation in high-yielding dairy cows. I. Effects on reproductive measurements

Niozas

Tsousis

Steinhöfel

et al. 2019

Journal of Dairy Science

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The objective of this prospective field study was to evaluate the effects of extending the lactation period on various reproductive measurements of highyielding Holstein cows. On 40 d in milk (DIM), cows were gynecologically examined (transrectal palpation, sonography, vaginoscopy). Cows without signs of clinical endometritis were blocked by parity and were randomly allocated to 1 of 3 experimental groups with a voluntary waiting period (VWP) of 40, 120, and 180 d, respectively (G40, n = 135; G120, n = 141; G180, n = 139). Cows of G120 and G180 were reexamined at the end of the VWP. If natural estrus was detected within 46 d after the end of the VWP, an artificial insemination was performed. If no estrus was detected, the respective cows were synchronized by applying the classical Ovsynch protocol. We found no difference in the proportion of cows in which estrus was detected between 40 to 86 DIM or in the days to first estrus between the 3 groups. Estrus detection in this period was lower in cows with body condition score <3 on 90 DIM compared with body condition score ≥3 (61.5 vs. 76.0%) and in cows with high energy-corrected milk production (ECM) on 92 DIM [58.6 vs. 70.1%, for cows with higher and lower than the median (39.9 kg) ECM, respectively]. The proportion of cows that estrus was detected within 46 d after the VWP was greater in G120 (88.9%) and G180 (90.8%) compared with G40 (70.4%). These effects were more apparent in cows with high ECM. The rate of estrus detection and of becoming pregnant in this period was greater for G120 (hazard ratio = 2.2 and 1.6, respectively) and for G180 (hazard ratio = 2.4 and 1.8) compared with G40. Cows in both groups with extended lactation had greater overall first service conception rates (G120 = 48.9%; G180 = 49.6%) and a lower number of services per pregnant cow (G120 = 1.56 ± 0.1; G180 = 1.51 ± 0.1) compared with G40 (36.6%; 1.77 ± 0.1). We observed no difference in pregnancy loss or in the proportion of cows culled up to 305 d of lactation between the 3 groups. The number of Ovsynch protocols per 1,000,000 kg of ECM was reduced by 75% in G180 and by 74% in G120 compared with G40 (5.9 vs. 7.1 vs. 25.1). In conclusion, extending the lactation of dairy cows can improve main reproductive measurements in high-yielding cows.

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Section: Discussionmentioning

confidence: 98%

Extended lactation in high-yielding dairy cows. I. Effects on reproductive measurements

Niozas

Tsousis

Steinhöfel

et al. 2019

Journal of Dairy Science

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“…In the sensitivity analysis, there were not any discrepancies neither in the differences between treatments nor in the hierarchy of treatments. Also another sensitivity analysis was performed by excluding those studies, or subgroups within studies, which are conducted with heifers and we did not observe any notable difference in results (King and Robertson, 1974;Stevenson et al, 2000Stevenson et al, , 2008Iwakuma et al, 2008;Karakas et al, 2009;Nak et al, 2009;Gordon et al, 2010). In another sensitivity analysis that we performed excluding the studies published in Turkish journals in Turkish language, we did not encounter any different results compared to the primary model (Aksu, 2010;Bülbül and Ataman, 2005;Kaçar, 2008).…”

Section: Synthesis Of the Resultsmentioning

confidence: 71%

Comparison of synchronisation protocols on pregnancy rate in dairy cows and heifers: A systematic review and network meta-analysis

Ambarcioglu,

Mavridis,

Yazlik

et al. 2023

J Hellenic Vet Med Soc

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Estrus synchronisation protocols are used as an essential strategy in the reproductive management of dairy herds, including Ovsynch, Presynch, Selectsynch, Heatsynch, Cosynch, Double-Ovsynch, and some other combinations of these, while the optimal protocol is still uncertain. We performed a network meta-analysis (NMA) to compare the efficacy of the synchronisation protocols in dairy cows and heifers. Pubmed, Scopus, Web of Science, Cabi Direct, and The Cochrane Library were searched up to May 13, 2019. The comparison of synchronisation protocols in terms of pregnancy rate was done by combining direct and indirect evidence. Ranking the synchronisation protocols were conducted by using surface under the cumulative ranking curve (SUCRA). 48 randomized trials involving 9 different protocols were included. Compared with the control group, none of the synchronisation protocols were more effective in pregnancy rate at first insemination. Presynch+Ovsynch was found to be more efficient than Ovsynch (RR=1.21, 95% CI:1.04-1.40), also Presynch+Ovsynch and Presynch+Heatsynch were superior to Presynch+Selectsynch (RR=2.01, 95% CI: 1.03-3.93 and RR=1.91, 95% CI: 1.21-3.01). In conclusion, presynchronisation strategies such as Presynch+Ovsynch increase the effectiveness of pregnancy rate at first insemination related to other synchronisation protocols. Nevertheless, the non-superiority of the synchronisation protocols against not applying any hormonal treatments should be considered in reproductive management in dairy herds.

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“…This study was conducted in a commercial dairy farm located in Ankara province (N39.32021, E32.91506). Animals were inseminated using fixed‐time artificial insemination followed by a presynch‐ovsynch synchronization program (Giordano et al, 2016; Gordon et al, 2010). To eliminate the bull/sperm effect on pregnancy, heifers and cows were inseminated with commercially available frozen bull semen from a single Holstein bull of known fertility, frozen at the same collection date.…”

Section: Methodsmentioning

confidence: 99%

Ultrasonographic patterns of different regions of uterus according to pregnancy in cows and heifers

Olğaç,

Yazlik,

Kaya

et al. 2023

Animal Science Journal

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This study aimed to detect pregnancy within the first 20 days after artificial insemination by evaluating the ultrasonographic patterns of the different regions of uterus in Holstein heifers and cows. Animals were divided into subgroups according to pregnancy on 28th day as pregnant (heifer, n: 15; cow, n: 15) and non‐pregnant (heifer, n: 15; cow, n: 15). Images were taken from the ovulation‐side cornu uteri (OSC), non‐ovulation‐side cornu uteri (NOSC), and the corpus uteri (CU) on alternate days from D0 to D20. The images were evaluated by ImageJ software in terms of mean gray value (MGV), homogeneity (HOM), and contrast (CON) and endometrium thickness (ET). The mean MGV and G*T and P*T interactions, the mean CON and G*T and G*P interactions, the mean HOM and G*P interactions, and the mean ET and G*P interactions were statistically significant (p < 0.05). In receiver operating characteristic analyses, D2–D6 for CON and D2, D6, D8, D16, and D20 for HOM of OSC in cows and D8 and D10 MGV and D18 and D20 ET of OSC in heifers had high relationship with positive pregnancy (p < 0.05). The use of echogenicity evaluations and endometrium thickness measurements in reproductive management seems to be suitable for the prediction of pregnancy in cows and heifers.

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Effects of presynchronization and postinsemination treatments on pregnancy rates to a timed breeding Ovsynch protocol in dairy cows and heifers

Cited by 5 publications

References 25 publications

Extended lactation in high-yielding dairy cows. I. Effects on reproductive measurements

Extended lactation in high-yielding dairy cows. I. Effects on reproductive measurements

Comparison of synchronisation protocols on pregnancy rate in dairy cows and heifers: A systematic review and network meta-analysis

Ultrasonographic patterns of different regions of uterus according to pregnancy in cows and heifers

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