Administering an additional prostaglandin F2α injection to Bos indicus beef cows during a treatment regimen for fixed-time artificial insemination

Noronha, Isabella M.; Cooke, Reinaldo F; Martins, Cícero Fleury Guedes; Filho, R.V. Oliveira; Pohler, K. G.; Vasconcelos, José Luiz Moraes

doi:10.1016/j.anireprosci.2020.106535

Cited by 7 publications

(6 citation statements)

References 29 publications

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“…Reproductive traits such as age at puberty (Pitchford et al, 2022), as well as CR (Osoro and Wright, 1992) were reported to differ between purebred and crossbreed beef cows. Although several studies have evaluated the effect of PGF 2α analogues in the CR of beef cows (Leonardi et al, 2012;Pfeifer et al, 2018;Noronha et al, 2020), to the best of our knowledge this is the first study evaluating the effect of 10 mg of PGF 2α analogue at the moment of AI in crossbreed (½ Nellore and ½ Angus) beef cows. In Nellore cows, Noronha et al (2020) assessed the effect of an extra injection of PGF 2α analogue (dinoprost tromethamine) 2d before AI during a FTAI protocol.…”

Section: Discussionmentioning

confidence: 99%

“…Although several studies have evaluated the effect of PGF 2α analogues in the CR of beef cows (Leonardi et al, 2012;Pfeifer et al, 2018;Noronha et al, 2020), to the best of our knowledge this is the first study evaluating the effect of 10 mg of PGF 2α analogue at the moment of AI in crossbreed (½ Nellore and ½ Angus) beef cows. In Nellore cows, Noronha et al (2020) assessed the effect of an extra injection of PGF 2α analogue (dinoprost tromethamine) 2d before AI during a FTAI protocol. In their study (Noronha et al, 2020), cows receiving an extra injection of PGF 2α had greater pregnancy per FTAI and larger preovulatory follicle in comparison to control cows.…”

Section: Discussionmentioning

confidence: 99%

“…In Nellore cows, Noronha et al (2020) assessed the effect of an extra injection of PGF 2α analogue (dinoprost tromethamine) 2d before AI during a FTAI protocol. In their study (Noronha et al, 2020), cows receiving an extra injection of PGF 2α had greater pregnancy per FTAI and larger preovulatory follicle in comparison to control cows. Diniz et al (2021) also evaluated the effect of dinoprost tromethamine (PGF 2α analogue) at the time of AI, using a dose of 12.5 mg, in Nellore cows and demonstrated that PGF 2α treatment tended to increase pregnancy rates of suckled Nellore cows that did not display estrous behavior.…”

Section: Discussionmentioning

confidence: 99%

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Application of PGF2α at the moment of fixed-time artificial insemination in crossbred beef cows

et al. 2022

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Although studies have shown positive effects of gonadotropin releasing hormone (GnRH) or prostaglandin F 2α (PGF 2α ) at the moment of fixed-time artificial insemination (FTAI) in the conception rate (CR) of cattle, its effects on treatments based on progesterone (P4) and estradiol benzoate (EB) is still not conclusive. The objective of this study was (1) to evaluate the effect of a PGF 2α analogue at FTAI in the CR of crossbred beef cows submitted to a 11d FTAI protocol based on P4 and EB; and (2) to describe the CR between PGF 2α -treated and control cows in different body condition scores (BCS) and parity categories. Crossbred (½ Nellore and ½ Angus) beef cows were submitted to a synchronization protocol and randomly assigned into 2 groups: Control (n = 163), at FTAI cows received 2 mL of saline solution as a placebo, and PGF 2α (n = 163), at FTAI cows were treated with PGF 2α analogue (10 mg of dinoprost tromethamine). Pregnancy diagnosis was performed 33d post-FTAI. Binary logistic regression model was used to analyze the effect of PGF 2α treatment on CR. There was no difference in CR between PGF 2α and control groups (P > 0.05; odds ratio (OR) = 0.92; confidence interval (CI) = 0.59-1.4). A greater CR was found in heifers (P = 0.0006, OR = 2.65, CI = 1.61 -4.38) and multiparous (P = 0.0006, OR = 2.12, CI = 1.04 -4.3) when compared to primiparous cows. Cows with low BCS (4; 9-point scale) showed lower CR when compared with moderate BCS (5-6; 9-point scale) (P < 0.05; OR = 0.10; CI = 0.06 -0.18). There was no numerical difference on CR between PGF 2α -treated and control cows in different BCS and parity categories. The results suggested that the CR in this study was not influenced by 10 mg PGF 2α analogue at FTAI.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Application of PGF2α at the moment of fixed-time artificial insemination in crossbred beef cows

et al. 2022

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“…Cows were allocated into three breeding groups of approximately 120 cows each, according to calving date, according to the general management practices of the farm. All cows were submitted to the same timed-AI protocol (Noronha et al, 2020), for first service, as described below: On day 0 (D0), cows received 2mg (im) of estradiol benzoate (EB; Gonadiol ® ; Zoetis, São Paulo, SP, Brazil) and intravaginal P4 releasing device (CIDR ® ; Zoetis). On day 7 (D7), all animals received 12.5mg (im) of PGF 2α analogue, dinoprost tromethamine (Dinoprost; Lutalyse ® ; Zoetis).…”

Section: Methodsmentioning

confidence: 99%

“…Fixed-time artificial insemination (Timed-AI) programs with estradiol (E2) and progesterone (P4) have been widely used for Bos indicus cows as a reproductive management tool in commercial beef farms (Bó et al, 2003;Meneghetti et al, 2009;Sá Filho et al, 2009, 2012Silva et al, 2018;Noronha et al, 2020) which has considerably increased the use of AI in Bos indicus cattle (Baruselli et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

In vitro sperm characteristics and in vivo fertility of sex-sorted and conventional semen in suckled Nelore cows at a traditional schedule for timed-AI with estrus detection

Diniz

Riveros

Teixeira

et al. 2022

Arq. Bras. Med. Vet. Zootec.

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The aim of this study was to assess in vitro sperm characteristics and pregnancies/AI (P/AI) of conventional and sex-sorted semen at timed-AI of suckled, multiparous Nelore cows. All cows (n=348) were submitted to a traditional estradiol/progesterone(P4)-based protocol. At 48h after P4-device removal, the estrous behavior was recorded, and AI was performed with conventional or sex-sorted semen from two bulls. The following sperm assessments were performed: CASA, Hyposmotic Test, sperm morphometry and chromatin structure by TB staining. P/AI were reduced (P<0.001) for sex-sorted compared to conventional semen in cows expressing estrus (27vs47%) or not (11vs.37%). Membrane integrity (Bull1: 30.3±9.6 vs. 52.3±12.4%, P=0.01; Bull2: 24.5±3.0 vs. 48.7±1.6%, P=0.006) and sperm concentration (Bull1: 23.2±0.6 vs. 43.0±0.8x10⁶sperm/mL, P<0.001; Bull2: 25.1±2.8 vs. 42.1±0.7x10⁶sperm/mL; P<0.001) were reduced in sex-sorted compared to conventional semen, for both bulls. Total and progressive motility were reduced in sex-sorted semen for Bull1 (TM: 49.7±15.9 vs. 94.9±1.9%, P=0.007; PM: 16.7±3.4 vs. 44.1±13.2%, P=0.009) and no differences were detected for Bull2 (TM: 45.0±17.5 vs. 68.2±19.1%, P=0.098; PM: 12.8±4.7 vs. 30.0±13.0%, P=0.065). Sperm ellipticity from sex-sorted was lower than conventional semen for Bull2 (0.306±0.01 vs. 0.342±0.02, P=0.02) and no difference was detected for Bull1 (0.332±0.01 vs. 0.330±0.01, P=0.55). Reduced in vivo fertility was observed for sex-sorted semen, regardless of estrous behavior. In vitro sperm quality of sex-sorted semen was compromised for both bulls, but differently affected for each sire.

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Gastrointestinal nematode control programs in yearling Nellore heifers: Analysis of fecal egg counts, weight gain and reproductive indices

Couto

Zapa

Heller

et al. 2021

Animal Reproduction Science

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Administering an additional prostaglandin F2α injection to Bos indicus beef cows during a treatment regimen for fixed-time artificial insemination

Cited by 7 publications

References 29 publications

Application of PGF2α at the moment of fixed-time artificial insemination in crossbred beef cows

Application of PGF2α at the moment of fixed-time artificial insemination in crossbred beef cows

In vitro sperm characteristics and in vivo fertility of sex-sorted and conventional semen in suckled Nelore cows at a traditional schedule for timed-AI with estrus detection

Gastrointestinal nematode control programs in yearling Nellore heifers: Analysis of fecal egg counts, weight gain and reproductive indices

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