Avaliação de diferentes doses de eCG na ressincronização da ovulação em vacas nelore lactantes submetidas à IATF

Doroteu, Emanuel M; Oliveira, Rodrigo Arruda de; Pivato, I.

doi:10.1590/s1519-99402015000200019

Cited by 4 publications

(3 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Regarding resynchronization, there are three methodologies: the super precocious resynchronization, that is, pregnancy diagnosis (PD) on day 14 (d14) post-TAI using colourful Doppler (Pugliesi et al, 2014), without PD on d22 (Sá filho et al, 2014), and the traditional resynchronization, in which PD is done on d30 after TAI (Doroteu, Oliveira, & Pivato, 2015).…”

Section: Introductionmentioning

confidence: 99%

Resynchronization of ovulation with new and reused intravaginal progesterone‐releasing devices without previous pregnancy diagnosis in Bos taurus indicus cows subjected to timed‐artificial insemination

Oliveira

Kozicki

Gaievski

et al. 2019

Reprod Domestic Animals

View full text Add to dashboard Cite

Contents The study aimed to evaluate pregnancy per artificial insemination (P/AI) of cows subjected to synchronization and resynchronization in ovulation protocols using intravaginal progesterone‐releasing insert (P4) before pregnancy diagnosis (PD) and the relationship of PR with the diameter of preovulatory follicles (ØPOF) before TAI. Cows (n = 378) were distributed into two groups: a resynchronization group with new devices (GRN; n = 185) and resynchronization group with used devices (GRU; n = 193). On Day 0, both groups received a new P4 and estradiol benzoate (EB). On D8, P4 removal + D‐cloprostenol + eCG + estradiol cypionate (EC) was done. On d10, TAI was conducted. On d32, cows were resynchronized and divided into two groups, GRN (n = 185) and GRU (n = 193). The GRN group received a new P4 + EB, and the GRU group received a used P4 + EB. On d40, the P4 was removed + PD. The non‐pregnant cows received D‐cloprostenol + eCG + EC. US was done again on d42 to determine ØPOF before the second TAI. The P/AI of the GRN and GRU groups after synchronization were 56.2% and 57.0% (p = 0.87), respectively, and those after resynchronization were 58.0% and 37.3% (p < 0.008), respectively. The P/AI of the GRN and GRU groups observed after TAI (synchronization + resynchronization) were 81.6% and 73.1%, respectively (p = 0.047). No difference (p = 0.067) in ØPOF between the pregnant and non‐pregnant cows in the GRN was found, whereas the GRU group showed a significant difference (p = 0.003). Resynchronization protocols optimized the P/AI in both groups. New intravaginal devices resulted in greater P/AI and P/AI accumulation in resynchronization as compared with the GRU; the ØPOF was related with P/AI.

show abstract

Section: Introductionmentioning

confidence: 99%

Resynchronization of ovulation with new and reused intravaginal progesterone‐releasing devices without previous pregnancy diagnosis in Bos taurus indicus cows subjected to timed‐artificial insemination

Oliveira

Kozicki

Gaievski

et al. 2019

Reprod Domestic Animals

View full text Add to dashboard Cite

show abstract

“…The crown-rump (CR) and crown-nose (CN) measures, for the conceptus with CR length between 2.00 cm and 15.00 cm, showed a high linear correlation coefficient (R = 0.990865), being = (0,3027 * ) + 0,4491, ( = 0,9818), the equation that describes the behavior of the variables in this range. About the prediction of gestational age (GA), was considered the equation = −10,76 + (Figueiredo et al, 1997;Monteiro, Carvalhal & Perri, 2003;Sartori & Barros, 2011;Santos et al, 2014;Doroteu, Oliveira & Pivato, 2015;Moreira et al, 2015), tornando o nicho investigativo e o potencial dos experimentos, bastante promissores para essas raças, buscando um maior entendimento para a realidade agropecuária, e não apenas fazendo-se paralelos e estrapolações dos achados em raças taurinas.…”

Section: Abstract Study On Transuterine Migration and Emryo Sex Ratiounclassified

Estudo sobre a migração transuterina e a razão sexual de conceptos em bovinos da raça Nelore (Bos taurus indicus)

Borges¹

View full text Add to dashboard Cite

Capítulo I 1 1-Introdução 1 2-Revisão de Literatura 3 2.1-Gestação em bovinos e particularidades para Bos taurus indicus 3 2.2-Frequência gestacional em cornos uterinos direito e esquerdo 5 2.3-Migração transuterina de embriões bovinos 7 2.4-Razão e predileção sexuais nos cornos uterinos 2.5-Fetometria de conceptos bovinos 3-Referências Bibliográficas Capítulo II 1-Resumo 2-Abstract 3-Introdução 4-Materiais e Métodos 4.1-Animais 4.2-Levantamento de dados das gestações 4.2.1-Corno uterino gestante e corpo lúteo 4.2.2-Determinação do sexo fetal 4.2.3-Determinação dos comprimentos de crownrump (CR) e crown-nose (CN) do concepto 4.3-Bem-estar animal 4.4-Padronização da terminologia 4.5-Análise estatística 5-Resultados 6-Discussão 7-Conclusões 8-Referências Bibliográficas 0,0199 * , that gave minimum and maximum values of 28.6 days and 89.9 days for the smaller embryo found (CR = 0.55 cm) and those with CR = 15.00 cm, respectively. Thus, in Nellore the transuterine migration of conceptus may not exist, or consists of a rare event, in addition, the sex ratio and predilection are not distinguished from the symmetrical distribution, still keeping in mind the higher functional activity of the right ovary compared to the left, and the establishment of fetometry equation being CR and CN as variables, that can be useful, especially in reproductive evaluation, the veterinary field routine.

show abstract

“…However, no difference (P > 0.05) in pregnancy rates was noted between the two doses of eCG, and the lowest effective dose was recommended. Doroteu et al (2015) also evaluated the effect of two different doses of eCG on the pregnancy rate of lactating Nelore cows at 35 to 75 postpartum days, and found no differences in the pregnancy rate for animals receiving 200 or 300 IU of eCG on day (D) 8 of the synchronization protocol for FTAI (200 IU, 62.1%; 300 IU, 78.4%; P > 0.05).…”

Section: Introductionmentioning

confidence: 99%

Application of low dose of equine chorionic gonadotropin at acupoint Hou Hai for fixed-time artificial insemination in beef cows

Araújo

Mendes

Biscarde

et al. 2019

SCA

View full text Add to dashboard Cite

This study evaluated the efficiency application of low dose of equine chorionic gonadotropin (eCG) using Hou Hai acupoint for fixed-term artificial insemination (FTAI) in beef cows. Seventy cows received intravaginal devices with progesterone, and 3 mg of estradiol benzoate on day zero (D0) of FTAI. On D9, the devices were removed, and 150 ?g of prostaglandin F2? was applied; the animals were then randomly distributed to three treatment groups: T1 (n = 23), 300 IU of eCG intramuscularly (IM); T2 (n = 23), 90 IU of eCG at acupoint Hou Hai; and T3 (n = 25), 90 IU of eCG at false acupoint IM. On D10, the animals received 1 mg of gonadotropin-releasing hormone IM, and FTAI was performed, 52 h after the devices were removed. The quantitative variables with normal distribution were assessed using analysis of variance at 5% probability. For variables that did not show normal distribution, Kruskal-Wallis test at 5% probability was used. No significant difference was noted among the groups (P > 0.05) for the interval between device withdrawal at ovulation (58.2 ± 12.2 h), diameter of the largest follicle on D9 (9.9 ± 2.2 mm), diameters of the ovulatory follicle (12.2 ± 3.0 mm) and the second largest follicle (6.7 ± 2.1 mm), follicular growth rate (0.8 ± 0.3 mm/d), ovulation rate (82%), corpus luteum size (2.32 ± 0.35 cm2), and pregnancy rate (58.67%). The protocol cost per animal was US$ 10.67 (T1) and US$ 8.50 (T2 and T3). The use of 90 IU of eCG applied at Hou Hai acupoint or at false acupoint caused satisfactory synchronization of estrus in beef cows. In addition, this procedure was cost-effective.

show abstract

Avaliação de diferentes doses de eCG na ressincronização da ovulação em vacas nelore lactantes submetidas à IATF

Cited by 4 publications

References 9 publications

Resynchronization of ovulation with new and reused intravaginal progesterone‐releasing devices without previous pregnancy diagnosis in Bos taurus indicus cows subjected to timed‐artificial insemination

Resynchronization of ovulation with new and reused intravaginal progesterone‐releasing devices without previous pregnancy diagnosis in Bos taurus indicus cows subjected to timed‐artificial insemination

Estudo sobre a migração transuterina e a razão sexual de conceptos em bovinos da raça Nelore (Bos taurus indicus)

Application of low dose of equine chorionic gonadotropin at acupoint Hou Hai for fixed-time artificial insemination in beef cows

Contact Info

Product

Resources

About