Pre-TAI protocol strategies to increase reproductive efficiency in beef and dairy cows

Sales, J. N. S.; Simões, L. M. S.; Orlandi, R. E.; Lima, Eduardo Alves; Santos, Ana Paula; Bottino, M. P.; Silva, Luiz Augusto Capellari Leite da; Souza, José Camisão de; Dias, Marcelo Fernandes Pacheco; Massoneto, J.P.M.; Scandiuzzi, L.A.; Freitas, Bruno; Guerreiro, B. M.; Bastos, M. R.

doi:10.21451/1984-3143-ar2019-0041

Cited by 5 publications

(2 citation statements)

References 49 publications

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“…Uno de los motivos de los mejores resultados para eCG, en otros estudios, se atribuye a su concentración de LH. Se sabe que las vacas anestras tienen bajas concentraciones sanguíneas de LH (21). Por lo tanto, las diferencias de FSH en relación con eCG en la tasa de preñez pueden estar relacionadas con las diferencias entre las concentraciones de LH en la sangre de las vacas.…”

Section: Discussionunclassified

“…Corroborando los resultados del presente estudio, se encontró un efecto positivo del uso de eCG en la tasa de preñez en IATF de vacas Bos indicus con PCC ≤ 3 (21). El aumento de eCG no es necesario en animales con un buen PCC (≥ 2.5) o que son cíclicos, ya que, en estas condiciones, la eCG no promueve una mejora en las tasas de embarazo, puesto que ya se ha alcanzado la puntuación de condición mínima (≥ 2.5) recomendada para llevar a cabo protocolos IATF en bovinos (28), un hecho que ayuda a explicar los resultados del presente estudio.…”

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Effect of follicular growth promoters on timed artificial insemination in dairy cows.

et al. 2020

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Objective. To evaluate the efficiency of equine chorionic gonadotropin (eCG) and follicle stimulating hormone (FSH) on the pregnancy rate of crossbred cows from different body condition score (BCS) in the postpartum period in timed artificial insemination (TAI). Material and methods. The cows were subjected to the same hormone protocol: Day zero (D0), progesterone-release intravaginal device (PRID) and 2 mg estradiol benzoate (EB); D8, withdrawal of PRID, application 0.150 mg of prostaglandin. On D8, the animals were distributed into three treatments: 1 – (TeCG; n = 98) injection of 300 IU eCG; 2 – (TFSH; n = 84) injection of 20 mg of FSH and; 3 – (Control; n = 115) without further treatment. On D9, all animals received 1 mg of EB; D10, TAI of all the cows. After 30 days from TAI, ultrasound diagnosis of pregnancy was performed. Results. Pregnancy rate did not differ among eCG (52.04%), FSH (40.47%), and Control (40.00%) treated cows (p>0.05). In cows with low body condition, the pregnancy rate was higher (p<0.05) for cows treated with eCG (41.46%) when compared to FSH (18.18%) and Control (17.07%) cows. The postpartum interval among treatments was similar (p>0.05) (35–65 or 66–95days). Conclusions. The use of eCG or FSH did not result in an increase in the pregnancy rate when compared to the control treatment; however, eCG improved the pregnancy rate of cows with low body condition scores.

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Effect of follicular growth promoters on timed artificial insemination in dairy cows.

et al. 2020

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Benefits of using Double-Ovsynch versus presynch-ovsynch are affected by environmental heat in primiparous holstein lactating cows

Sun

Xiao

et al. 2023

Animal Reproduction Science

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Reproductive efficiency Nellore and crossbred cows submitted to administration of melengestrol acetate (MGA) after FTAI protocols

Valero

Guaitolini

Crespilho

et al. 2020

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This study aimed to evaluate the influence of medroxyprogesterone acetate (MGA) supplementation between the 13th and 20th day after Fixed-Time-Artificial Insemination (FTAI), on the conception and gestation rates of Nellore and crossbred cows (Nellore x Angus), pluriparous and lactating. For the study, 349 Nellore cows and 270 crossbred cows were selected, distributed into 1) group G1 (n=176): Nellore cows submitted to the FTAI protocol, without MGA supplementation; 2) group G2 (n=173): Nellore cows submitted to the FTAI protocol, with supplementation for 7 days of MGA® (0.28g/AU/day) from the 13th post-FTAI; 3) group G3 (n=119): crossbred cows: FTAI protocol, without MGA supplementation; 4) group G4 (n=151): crossbred cows: FTAI protocol followed by MGA supplementation for 7 days (0.28g/AU/day), from the 13th to the 20th day after FTAI. For statistical analysis, the procedures MIXED and GLIMMIX from SAS were used. G3 had higher rates of conception (CR=85.7%) and pregnancy (PR=95.8%) at the end of the breeding season (P<0.05), without the interference of supplementation with MGA (P>0.05). G1 females had a lower conception rate (TC=76.7%) (P<0.05), with the use of MGA® (CR-MGA=59.5%), but similar rates of pregnancy (PR=90.3%; PR-MGA=92.5%) to the G2, at the end of the breeding season (P>0.05). When G2 and G4 were compared, we found that crossbred females supplemented had higher rates of conception and pregnancy. In conclusion, crossbred animals have higher conception and pregnancy rates at the end of the breeding season. Besides, we found that Nellore females had a lower conception rate, with the use of MGA® Premix.

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Pre-TAI protocol strategies to increase reproductive efficiency in beef and dairy cows

Cited by 5 publications

References 49 publications

Effect of follicular growth promoters on timed artificial insemination in dairy cows.

Effect of follicular growth promoters on timed artificial insemination in dairy cows.

Benefits of using Double-Ovsynch versus presynch-ovsynch are affected by environmental heat in primiparous holstein lactating cows

Reproductive efficiency Nellore and crossbred cows submitted to administration of melengestrol acetate (MGA) after FTAI protocols

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