Comparison of fertility, regular returns-to-estrus, and calving interval between Ovsynch and CO-synch + CIDR protocols in dairy cows

Azevedo, Carlos; Maia, Ivan G.; Canada, Nuno; Simões, João

doi:10.1016/j.theriogenology.2014.07.006

Cited by 11 publications

(10 citation statements)

References 29 publications

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“…Promising synchronization results with Ovsynch and Progestagen regimen have been obtained in cattle and sheep on a large scale (Martinez-Tinajero et al, 2011;Azevedo et al, 2014). Ovsynch protocol involves GnRH-PGF 2α -GnRH treatment.…”

Section: Introductionmentioning

confidence: 99%

Oestrous Response and Conception Rate in Malabari Cross-Bred Goats Following Two Different Oestrus Synchronization Protocols

Panicker¹

2015

J. Anim. Health Prod.

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| The comparative efficacy of two oestrus synchronization protocols using Ovsynch and progestagen (TRIU -C ® ) was analysed based on the reproductive performance in Malabari cross bred goats. Early onset of oestrus with higher oestrus response was observed in the progestagen group of animals. However, there was no significant difference between the two protocols, on the duration and intensity of oestrus. When diagnosed by ultrasound sonography, the conception rate following the two protocols did not find to vary significantly. Even though, the intensity of oestrus did not vary with the protocols, the intensity was higher (P<0.05) in the conceived group of animals than those failed to conceive. This study suggests that the oestrus intensity has a correlation to the conception rate in goats. Keywords MATERIALS AND METHODS animalS and FeedingA total of 16 healthy Malabari crossbred multiparous goats aged between 3-4 years and body weight around 20-25 kg were selected for the study. The animals were exposed to natural lighting conditions at latitudes between 11°47' N & 15°58' N, where maximum temperature and relative humidity is ranging between 27-29 o C and 78-88 mm/Hg respectively during the breeding season. They were fed with a daily ration of 200 g concentrate mixture per animal (Table 1). In addition, free access to green grass and water was made available. Synchronization ProtocolSThe goats were divided into two groups of eight animals each. Goats belonging to Group I were subjected to oestrus synchronization by using Ovsynch Protocol with first dose of Buserelin injection (0.004mg), GnRH analogue (1ml Receptal ® , Intervet, Holland) on day 0 intramuscularly followed by an intramuscular injection of prostaglandin (12.5 mg) Dinoprost (2.5 ml Lutalyse ® , Pfizer, Belgium) on 7 th day. Forty eight hours after prostaglandin treatment (day 9 th ), a second dose of Buserelin (0.004mg) was again administered intramuscularly. grouP i (ovSynch Protocol)Animals in Group II were subjected to the intra-vaginal placement of progesterone device (TRIU-C ® , Virbac, India) containing 160 mg of natural progesterone along with intramuscular injection of GnRH (Buserelin,0.004 mg) on the first day of the experiment (day 0). The intravaginal device was retained for seven days and at the time of withdrawal (day 7 th ) an intramuscular injection of 12.5 mg of Dinoprost, an analogue of PGF 2α (2.5 ml Lutalyse ® , Pfizer, Belgium) was administered. grouP ii (ProgeStagen-triu-c ® Protocol)Twenty four hours after the prostaglandin treatment the goats in each group were exposed to apronised bucks for 30 minutes for detection of oestrus and its scoring. The Flehmen's reaction shown by the teaser buck was primarily observed and the intensity of oestrus signs in does was determined ( Table 2). The goats were inseminated with fresh semen 72 hours (day 10 th ) after the administration of the prostaglandin injection and re-inseminated twenty four hours after the first insemination (day 11 th ). The does were observed for the onset ...

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Section: Introductionmentioning

confidence: 99%

Oestrous Response and Conception Rate in Malabari Cross-Bred Goats Following Two Different Oestrus Synchronization Protocols

Panicker¹

2015

J. Anim. Health Prod.

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“…Ovulation synchronization with timed artificial insemination (TAI) protocols using GnRH and PGF 2a (e.g., Ovsynch and Co-Synch) in combination with controlled internal drug release (CIDR) for 7 days have been successfully applied in lactating dairy cows, avoiding heat detection [2]. These protocols have resulted in acceptable pregnancy rates after TAI (P/TAI) ranging between 40% and 60% [2][3][4][5]. However, poorer ovulation synchronization and pregnancy rates (25.8%-45.5%) have been obtained in dairy heifers treated with 7-day protocols based on GnRH and PGF 2a [1,[6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Comparison of 4- versus 5-day Co-Synch + controlled internal drug release (CIDR) + timed artificial insemination protocols in dairy heifers

et al. 2015

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“…To improve the efficiency of the Ovsynch protocol, some authors tried to incorporate the progesterone-releasing devices into this regimen to improve the conception rate [8]. Studies in cattle have emphasized the effect of CIDR-PGF2α and Ovsynch-CIDR estrus synchronization regimens on pregnancy outcome [9] and calving interval [10]. However, to the best of our knowledge, scarce studies have assessed the influence of CIDR-PGF2α and Ovsynch-CIDR regimens on ovarian activity and hemodynamic in buffaloes.…”

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confidence: 99%

Ovarian follicular changes and hemodynamics in Egyptian buffaloes under CIDR-PGF2α and Ovsynch-CIDR estrus synchronization treatments

Samir

Kandiel

El‐Maaty

et al. 2019

Journal of Reproduction and Development

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This study aimed at investigating the efficacy of two protocols of estrous synchronization on follicular changes and hemodynamics. Pluriparous Egyptian buffaloes (n = 36) were synchronized either with controlled internal drug release (CIDR)-PGF2α (7-days CIDR insert with PGF2α injected on the 6th day; n = 18) or Ovsynch-CIDR (Ovsynch protocol concurrent with 7-days CIDR insert; n = 18). Blood sampling and ovarian ultrasound examinations (Grayscale, color and power Doppler modes) were conducted on the Day of CIDR removal, estrus, and luteal phase. Mean follicle diameter (MFD), first (1st-LF) and second (2nd-LF) largest follicle diameters, and E2 levels significantly increased in the CIDR-PGF2α group at CIDR withdrawal. Ovsynch-CIDR markedly fortified higher follicle population, MFD, and 1st-LF diameter at estrus and corpus luteum (CL) volume at the luteal phase in concomitant with increases (P < 0.05) in E2 (at estrus) and P4 (at luteal phase). At CIDR removal, the blue pixels in the dominant follicle (DF) were higher (1.5 times; P = 0.054) in the Ovsynch-CIDR than in the CIDR-PGF2α. At estrus, total blood flow (TBF) and power Doppler pixels (PDP) to DF(s) were noticeably higher (seven and 1.6 times; respectively) in the Ovsynch-CIDR than in CIDR-PGF2α (5906 ± 237 vs. 830 ± 60 pixels, P < 0.01 and 5479 ± 322 vs. 3377 ± 19 pixels, P < 0.05; respectively). At the luteal phase, TBF and PDP to the CL increased in the Ovsynch-CIDR group than in the CIDR-PGF2α group (11060 ± 965 vs. 7963 ± 480 pixels, 1.4 times, P = 0.05 and 18900 ± 1350 vs. 13220 ± 568 pixels, 1.1 times, P = 0.005; respectively). In conclusion, based on the improvement in synchronized follicular activity and hemodynamics, the Ovsynch-CIDR regimen is persuaded in Egyptian buffaloes.

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Comparison of fertility, regular returns-to-estrus, and calving interval between Ovsynch and CO-synch + CIDR protocols in dairy cows

Cited by 11 publications

References 29 publications

Oestrous Response and Conception Rate in Malabari Cross-Bred Goats Following Two Different Oestrus Synchronization Protocols

Oestrous Response and Conception Rate in Malabari Cross-Bred Goats Following Two Different Oestrus Synchronization Protocols

Comparison of 4- versus 5-day Co-Synch + controlled internal drug release (CIDR) + timed artificial insemination protocols in dairy heifers

Ovarian follicular changes and hemodynamics in Egyptian buffaloes under CIDR-PGF2α and Ovsynch-CIDR estrus synchronization treatments

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