Reproductive parameters of Santa Inês ewes submitted to short-term treatment with re-used progesterone devices

Pinna, Andrea; Brandão, Felipe Zandonadi; Cavalcanti, Amanda dos Santos; Borges, Álan Maia; Souza, Juliana; Fonseca, J. F. da

doi:10.1590/s0102-09352012000200012

Cited by 24 publications

(31 citation statements)

References 21 publications

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“…Thus, according to the data obtained in the present experiment, where the beginning of the LH peak occurred 26‐37 hr (Table ) after CIDR removal, and taking into account that frozen semen remains viable for only 6 hr in the reproductive tract, we can affirm that the optimal time for AI is approximately 50 hr because the ewes in this study ovulated at 60 (G‐6 IN), 49 (G‐12 IN), 51 (G‐6 OUT), and 52 hr (G‐12 OUT) after removal of the CIDR, 52 hr on average. In another Brazilian study, Santa Inês ewes ovulated on average 55 hr after CIDR removal, reinforcing the findings of the present study (Pinna et al., ).…”

Section: Resultssupporting

confidence: 89%

Characterization of the LH peak after short and long fixed‐time artificial insemination protocols in sheep raised in the tropics

Soriano

Ruediger

Zundt

et al. 2018

Animal Science Journal

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The aim of this study was to evaluate the peak in luteinizing hormone (LH) and the pregnancy rate of sheep (Texel × Santa Inês) in the tropics using short- (6 days) and long-term (12 days) progesterone protocols followed by artificial insemination (AI) both in and out of the breeding season. Experiment 1 was conducted within (IN) the breeding season (autumn, n = 36), and experiment 2 was conducted outside (OUT) of the breeding season (spring, n = 43). In each experiment, the sheep were divided into two groups (6 or 12 days) according to the duration of treatment with a single-use progesterone release vaginal device (CIDR , Pfizer, São Paulo, SP, Brazil), and blood samples were collected from 10 animals per group every 4 hr to measure the LH and progesterone concentrations. In the spring, the characteristics of the LH peak did not differ between groups; but in the autumn, there were differences between groups at the beginning (G-6 IN: 36.44 ± 5.46 hr; G-12 IN: 26.57 ± 4.99 hr) and end of the LH peak (G-6 IN: 46.22 ± 7.51 hr; G-12 IN: 34.86 ± 8.86 hr). The results showed alterations in the LH peak during the breeding season only in the sheep undergoing the short-term protocol.

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Section: Resultssupporting

confidence: 89%

Characterization of the LH peak after short and long fixed‐time artificial insemination protocols in sheep raised in the tropics

Soriano

Ruediger

Zundt

et al. 2018

Animal Science Journal

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“…The number of ovulations per ewe, the average follicular diameter and interval to ovulation did not differ between groups and were similar to other studies (Pinna et al, 2012). Other studies with short progestagen protocols showed similar efficiency.…”

Section: Resultssupporting

confidence: 88%

Effects of GnRH administration on ovulation and fertility in ewes subjected to estrous synchronization

et al. 2012

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-The objective of this study was to verify the effects of GnRH on ovulation and pregnancy of ewes subjected to a short-term synchronization of estrus. Santa Inês and crossbred Santa Inês/Dorper ewes received 60 mg MAP sponges during 6 days plus 300 IU eCG and 30 μg d-cloprostenol 24 h prior to sponge withdrawal (SW). Ewes were assigned to receive 0.9% NaCl solution (T control ; n = 32) or 25 μg GnRH (licerelin, T GnRH ; n = 34) 24 hours after SW. Each group was assigned to intrauterine insemination by laparoscopy (n = 25) or to natural mating (n = 41). Artificial insemination was performed with a single dose of fresh semen. For controlled mating, females were exposed to males 12, 24, 36 and 48 hours after SW. Ten females per treatment were subjected to transrectal ultrasound examination at 12-hour intervals (SW to 60 hours after). Estrous response (100.0% vs 95.2%), interval from SW to estrus (32.9±7.4 vs 29.8±6.9 hours), estrous length (37.4±9.0 vs 31.5±10.4 hours), pregnancy rates (57.0% vs 41.0%), ovulation rate (100.0% vs 90.0%), number of ovulations/ewe (1.1±0.3 vs 1.2±0.4), maximum follicular diameter (6.4±0.7 vs 6.1±0.6 mm), interval from SW to ovulation (59.1±3.5 vs 58.4±3.5 hours) did not differ between T control and T GnRH , respectively. Administration of GnRH 24 hours after SW does not improve ovulation or pregnancy rate in estrous synchronization in ewes.

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“…This decrease in pregnancy rate may be related to the dominant follicle lifespan prolongation provoked by low P4 concentrations during treatment (Rubianes, Castro, &1996 & Carbajal, ; Viñoles et al, ). Additionally, Vilariño et al () and Pinna et al () showed that the use of new or once‐used devices was as effective as the use of new devices to synchronize oestrus and ovulation, with similar reproductive parameters observed when the short‐term protocol was used. Other studies have also demonstrated the possibility of reusing these devices in shorter treatment protocols (Cox et al, ; Nogueira et al, ; Vilariño et al, ; Vilariño, Rubianes, Lier, & Menchaca, ).…”

Section: Discussionmentioning

confidence: 98%

“…To our knowledge, the efficacy of short‐term using of CIDRs which previously used for different durations (6, 12, 18, 24 or 30 days) on reproductive performance and hormone profiles has not been widely investigated in sheep (Pinna et al, ; Ungerfeld, ; Ungerfeld et al, ; Vilariño et al, ). Additionally, the economic evaluation of using previously used CIDRs for oestrus synchronization in sheep has never been studied.…”

Section: Introductionmentioning

confidence: 99%

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Efficacy of using previously used controlled internal drug release (CIDR) insert on the reproductive performance, hormone profiles and economic measures of sheep

Swelum

Saadeldin

Moumen

et al. 2018

Reprod Domestic Animals

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This study was conducted using 120 multiparous Awassi ewes during the breeding season to compare the effects of using previously used controlled internal drug release (CIDR) on the hormone profiles, reproductive performance and economic measures of ewes. Ewes were randomized to receive one of five previously used CIDR (previously used for 6, 12, 18, 24 or 30 days) or the new CIDR as a control for 6 days (CIDR6, CIDR12, CIDR18, CIDR24, CIDR30, and CIDR0 [control], respectively). Blood samples were collected on four occasions, at the time of CIDR insertion, after 3 days of insertion, and at the time of withdrawal and insemination. Serum estradiol (E2) and progesterone (P4) concentrations were measured. Timed insemination was performed 48 hr post-CIDR withdrawal. Pregnancy was diagnosed by ultrasonography 23 days after insemination and confirmed on day 35. The heat detection rate was significantly (p < 0.05) higher in the CIDR0 and CIDR6 groups than in the CIDR18 and CIDR30 groups. The total pregnancy rate and fecundity were significantly (p < 0.05) higher in the CIDR6 group than in other groups. P4 level was significantly (p < 0.05) higher in the CIDR0 group than in the CIDR30 group at the time of removal. At each time point, the E2 level was significantly (p < 0.05) higher in the CIDR6 group than at the other groups. The total variable cost, total cost, return and net profit were higher in the CIDR6 and CIDR0 groups than in the other groups. In conclusion, although previously used CIDRs are efficient at synchronizing oestrus in ewes, the duration of previously usage significantly affected the reproductive parameters and economic profit. CIDRs previously used for 6 days and new CIDRs provided the highest fertility and fecundity rates, besides return and net profit. Economically, it is not advisable to use CIDRs that previously used for 12 days or more.

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Reproductive parameters of Santa Inês ewes submitted to short-term treatment with re-used progesterone devices

Cited by 24 publications

References 21 publications

Characterization of the LH peak after short and long fixed‐time artificial insemination protocols in sheep raised in the tropics

Characterization of the LH peak after short and long fixed‐time artificial insemination protocols in sheep raised in the tropics

Effects of GnRH administration on ovulation and fertility in ewes subjected to estrous synchronization

Efficacy of using previously used controlled internal drug release (CIDR) insert on the reproductive performance, hormone profiles and economic measures of sheep

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