Effect of estradiol valerate on ovarian follicle dynamics and superovulatory response in progestin-treated cattle

Colazo, M.G.; Martı́nez, M.F.; Small, J. A.; Kastelic, John P.; Burnley, C.; Ward, Douglas R.; Mapletoft, R.J.

doi:10.1016/j.theriogenology.2004.07.004

Cited by 33 publications

(26 citation statements)

References 31 publications

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“…The number of collected transferable embryos from group 2B does not differ or it was greater from those reported by others when collection was made from lactating cows, at non‐stated stage of lactation (Moreira et al. 2002; Colazo et al. 2005).…”

Section: Discussioncontrasting

confidence: 48%

Follicle Ablation Improves the Ovarian Response and the Number of Collected Embryos in Superovulated Cows During the Early Stages of Lactation

Amiridis¹,

Tsiligianni²,

Vainas³

2006

Reprod Domestic Animals

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A field study was designed to compare ovarian response and embryo yield in cows during early lactation when gonadotropin administration followed one of four treatments. In group 1A (n = 19) and 1B (n = 9), the estrouses were synchronized by two prostaglandin F2alpha (PG) injections given 11 days apart, and starting from day 9 of the synchronized cycle superovulation was conducted with eight decreasing dose of FSH. In group 1B, ablation of all follicles >3 mm was carried out on day 8. In group 2A and 2B (each n = 9), a progesterone plus oestradiol intravaginal device (PRID) was inserted for 11 days and gonadotropin administration started on day 9, while cows from group 2B had a follicle ablation on day 8. In all groups, two PG injections were given along with the sixth and the seventh dose of FSH, and the cows were twice inseminated 12 and 24 h after estrus detection. Embryos were collected on day 7. In cumulative results from aspirated and non-aspirated cows, follicular ablation significantly improved: the ovarian response (10 +/- 1.23 vs 6.69 +/- 0.60 corpora lutea per donor), the mean collected embryos (6.57 +/- 0.94 vs 2.46 +/- 0.53) and the mean transferable embryos (4.43 +/- 0.89 vs 2.18 +/- 0.47). Group 1B and 2B cows had better ovarian response than 1A (6.44 +/- 0.81, 12.25 +/- 4.11 and 9.44 +/- 0.93, for groups 1A, 1B and 2B, respectively, p < 0.05). Similarly, from groups 1B and 2B more (p < 0.05) embryos were collected in comparison with their respective group, while the mean transferable embryos from group 2B (5.22 +/- 1.13) was greater (p < 0.05) than that of group 1A (1.67 +/- 0.35), and tented to be greater than those of groups 2A (3.44 +/- 1.19, p = 0.062) and 1B (3.00 +/- 1.78, p = 0.066). The highest (p < 0.05) transferable embryo collection rate was recorded in group 2B (55.29%), followed by that of group 1B (41.33%). In summary, early in lactation, an acceptable number of transferable embryos can be collected from high producing dairy cows, when follicle ablation prior to superovulation is combined with progesterone and oestradiol administration.

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Section: Discussioncontrasting

confidence: 48%

Follicle Ablation Improves the Ovarian Response and the Number of Collected Embryos in Superovulated Cows During the Early Stages of Lactation

Amiridis¹,

Tsiligianni²,

Vainas³

2006

Reprod Domestic Animals

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“…Hormonal control of the timing of follicular wave emergence can target the superovulatory treatments to be initiated at the beginning of a follicular wave in normally cyclic cows (Bo et al, 2006) without the need to know the time of the base heat which is a difficult task in large dairy herds. Controlled internal drug release (CIDR) was the most commonly used hormonal source to control follicular wave emergence in combination with injections of estradiol -at varying dosages-and progesterone with variable results (Bo et al, 2002;Colazo et al, 2005 andHasler, 2014). Moreover, estrus detection during the superstimulatory protocol can be eliminated by using protocols which synchronize ovulation (Bo et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Preliminary study of factors affecting the superovulatory response of high producing dairy cows superstimulated regardless of the stage of estrous cycle in Egypt

Hussein

Aziz

Abdel‐Wahab

et al. 2014

Beni-Suef University Journal of Basic and Applied Sciences

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ParityPropylene glycol a b s t r a c t This work was conducted as a first time commercial production of embryos from lactating Holstein and Brown Swiss cows using multiple ovulation embryo transfer (MOET) technology in Egypt. We studied factors affecting the superovulatory response (SR) in superovulated cows and effects of propylene glycol (PG) on embryo quality. Daily milk production at flushing had significantly negative effects on SR and embryo yields in superovulated cows. In addition, Brown Swiss cows had better SR than Holstein cows.Moreover, cows having more than 3 parities yielded better response, compared to cows in the first three parities. However, factors such as body weight at flushing, body condition score (BCS) at flushing and days in milk (DIM) at flushing did not have any association with SR in cows. In addition, drenching of PG prior to and during the superovulatory treatment improved SR (Right CL number, P < 0.05; Left CL number, P < 0.05), total embryos per flush (P < 0.05), first grade embryos per flush (P < 0.01) and tended to improve transferable embryos (P ¼ 0.13) and second grade embryos per flush (P ¼ 0.11). However, it tended to increase the number of degenerated embryos per flush (0.06). In conclusion, commercial production of embryos from lactating Holstein and Brown Swiss cows regardless of stage of estrous cycle by MOET proved successful under Egyptian conditions. Milk yield was negatively associated with SR and embryo yields in superovulated cows. Moreover, drenching of PG prior to and during the superovulatory treatment improved SR and embryo yields.

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“…Em Bos taurus indicus, o tratamento eletivo para a indução da emergência da nova onda de crescimento folicular é a associação de estradiol (E 2 ) e progesterona (P 4 ). A eficiência desta associação tem sido descrita em diversos trabalhos em fêmeas Bos taurus taurus (BO et al, , 1994(BO et al, , 1995MARTINEZ et al, 2000;COLAZO et al, 2003COLAZO et al, , 2005. CARVALHO (2004) estudou o efeito do tratamento com estradiol e progesterona na emergência da onda folicular em novilhas Bos taurus indicus e Bos taurus taurus mantidas nas mesmas condições de manejo.…”

Section: Controle Da Dinâmica Folicularunclassified

“…Todos estes ésteres são capazes de induzir a regressão de folículos antrais quando administrados na presença de elevadas concentrações de progesterona (BO et al, 1995). O Valerato de estradiol e o Cipionato de estradiol apresentam meia vida mais longa, resultando na indução de uma nova onda folicular mais tardia e menos sincronizada (BO et al, 1995;COLAZO et al, 2003;COLAZO et al, 2005) que o 17 β estradiol (BO et al, 1995) ou Benzoato de estradiol (BO et al, 2002 Londrina, V. 6, N. 36, Ed. 223, Art.…”

Section: Em Novilhas Bos Taurus Taurus X Bos Taurus Indicusunclassified

Biotechnology reproductive and physiology reproductive female bovine - knowledge for success

Santos¹,

Santos²,

Costa³

et al. 2015

Pubvet

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ResumoAs biotecnologias buscam a eficiência reprodutiva dos rebanhos bovinos.Destas as mais utilizadas com sucesso são a inseminação Artificial (IA) e transferência de embriões (TE). Outras biotécnicas como a produção in vitro de embriões (PIVE) e clonagem, também contribuem para acelerar o melhoramento genético, porque incluem a utilização de animais superiores.Algumas biotecnologias utilizadas comercialmente em rebanhos leiteiros e de corte possuem limitações, dentre elas a PIVE, a qual sofre influência de vários fatores, como a taxa de recuperação oocitária e a variação individual na resposta ovariana aos tratamentos hormonais, requerendo mais estudos para avaliar o efeito da associação entre o início da onda folicular e o início do tratamento superestimulatório, tornando-se indispensável o amplo conhecimento da fisiologia reprodutiva da fêmea bovina.Palavras-chave: embriões, onda folicular, oócitos.

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Effect of estradiol valerate on ovarian follicle dynamics and superovulatory response in progestin-treated cattle

Cited by 33 publications

References 31 publications

Follicle Ablation Improves the Ovarian Response and the Number of Collected Embryos in Superovulated Cows During the Early Stages of Lactation

Follicle Ablation Improves the Ovarian Response and the Number of Collected Embryos in Superovulated Cows During the Early Stages of Lactation

Preliminary study of factors affecting the superovulatory response of high producing dairy cows superstimulated regardless of the stage of estrous cycle in Egypt

Biotechnology reproductive and physiology reproductive female bovine - knowledge for success

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