Characterization of the productive performance of Highlander sheep in Southern Chile. I. Female reproductive traits

Cox, J.F.; Jeria, Eduardo; Bocic, Antonio; Soto-Saravia, Ricardo; Dorado, J.; Saravia, F.

doi:10.1016/j.smallrumres.2015.06.010

Cited by 6 publications

(11 citation statements)

References 31 publications

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“…The frequencies of singletons and twin deliveries and prolificacy reported in this study are similar to other reports with ram effect (Cox et al., ; Ferreira‐Silva et al., ; Tenório Filho et al., ) and higher than to studies without the approach (Mexia et al., ). This fact may suggest a tendency for increased reproductive rates in ewes subjected to the ram effect, but direct comparisons within ewes subjected or not to the ram effect are required.…”

Section: Discussionsupporting

confidence: 91%

“…The frequencies of singletons and twin deliveries and prolificacy reported in this study are similar to other reports with ram effect (Cox et al, 2015;Ferreira-Silva et al, 2016;Tenório Filho et al, 2016) and…”

Section: After Introduction Of Rams Oestrus Was Detected Until Day 2supporting

confidence: 92%

“…Several factors that influence ram effect outcome, such as preconditioning period, potency of ram stimulus, experiment endpoint (De St Jorre, Hawken, & Martin, ). Under this same reasoning, ram effect displays important variation between wool and hair breeds (Cox et al., ; Monreal et al., ). Despite some reports in wool breeds that described higher incidence and at earlier oestrus detection after introduction of rams, progesterone source has a significant effect on reproductive outcome (Hashemi, Safdarian, & Kafi, ; Monteiro et al., ; Peclaris et al., ; Umberger et al., ).…”

Section: Discussionmentioning

confidence: 97%

“…In Santa Inês ewes, ovulatory follicles reach sizes varying from 5.1 to 5.7 mm (Saunders et al., ), while in this report, Santa Inês and Morada Nova ewes subjected to the ram effect displayed larger sizes, varying from 6.7 to 7.6 mm. Highlander ewes also display such larger ovulatory follicles under ram effect (Cox et al., ). This phenomenon is due to a higher frequency of LH pulses caused by introduction of rams that further leads to concomitant increase in follicular growth and E2 production (Martin et al., ).…”

Section: Discussionmentioning

confidence: 99%

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Reproductive performance of postpartum ewes treated with insulin or progesterone hormones in association with ram effect

Ferreira-Silva

Basto

Filho

et al. 2017

Reprod Domestic Animals

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The reproductive performance of postpartum Santa Inês (SI) and Morada Nova (MN) ewes treated with insulin or progesterone hormones in association with ram effect was evaluated. Ewes from SI (n = 69) and MN (n = 69) breeds were randomly allocated to three groups of each breed (T1-ram effect only; T2-ram effect + insulin; T3-ram effect + progesterone). Progesterone concentrations (ηg/ml; mean ± SD) before and after introduction of rams (n = 6) were 0.51 ± 0.22 and 3.78 ± 0.68 (T1), 0.65 ± 0.21 and 3.77 ± 0.78 (T2) and 0.52 ± 0.21 and 3.84 ± 0.84 (T3) in SI ewes and 0.74 ± 0.19 and 3.71 ± 0.56 (T1), 0.70 ± 0.21 and 3.79 ± 0.75 (T2) and 0.81 ± 0.14 and 3.87 ± 0.80 (T3) in MN ewes, respectively. Thus, lower progesterone concentrations were found before the introduction of rams (p < .05). After the introduction of rams, preovulatory peaks of LH (ηg/ml) occurred at 28 (T1), 44 (T2) and 48 (T3) hr in SI ewes and at 64 (T1), 40 (T2) and 44 (T3) hr in MN ewes. The mean number of ovulations was similar between groups (p > .05), was 1.3 ± 0.51 (T1), 1.5 ± 0.54 (T2) and 1.6 ± 0.51 (T3) in SI ewes and 1.3 ± 0.51 (T1), 1.6 ± 0.51 (T2) and 1.6 ± 0.51 (T3) in MN ewes. In conclusion, the ram effect alone is effective at inducing and synchronizing oestrus in sheep under postpartum anoestrus, irrespective of hormone treatments.

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Section: Discussionsupporting

confidence: 91%

Section: After Introduction Of Rams Oestrus Was Detected Until Day 2supporting

confidence: 92%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Reproductive performance of postpartum ewes treated with insulin or progesterone hormones in association with ram effect

Ferreira-Silva

Basto

Filho

et al. 2017

Reprod Domestic Animals

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“…Circulating P4 can be measured in serum or plasma and levels are both cyclical and age dependent. Specifically, in female sheep, >1 ng/mL circulating P4 concentration indicates luteal phase of cycling [ 5 ]. Therefore, circulating P4 concentration can be used to determine puberty and inform reproductive management practices in female small ruminants [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Analytical Validation of the IMMULITE® 2000 XPi Progesterone Assay for Quantitative Analysis in Ovine Serum

Jones

Megahed

Diehl

et al. 2022

Animals

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Monitoring circulating progesterone (P4) concentration is an important component of basic and applied reproduction research and clinical settings. IMMULITE® 2000 XPi (Siemens) is a newly upgraded fully automated immunoassay system marketed for human use to measure concentrations of different analytes including P4. Our objective was therefore to characterize the analytical performance of the IMMULITE® 2000 XPi P4 immunoassay across the reportable range in ovine serum. This validation of analytical performance included determining (1) linearity, (2) precision through within-run, and between-run coefficient of variation (CV) calculations, (3) accuracy through bias calculations for spiking-recovery bias and interlaboratory (range and average based) bias for two laboratories across the reportable range (0.2–40 ng/mL). The average within-run and between-run precision (CV%) across the reportable range of the IMMULITE® 2000 XPi P4 immunoassay for serum P4 concentration were both <5%, ranging between 2–8%. The average Observed Total Analytic Error (TEo) reported here for serum P4 concentration across the reportable range was ~30%, ranging from 14.8–59.4%, regardless of the considered bias. Based on these data we conclude that the automated IMMULITE® 2000 XPi P4 immunoassay provides a precise, accurate, reliable, and safe method for measuring P4 concentration ovine serum.

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Effect of bST administration on plasma concentrations of IGF-I and follicular dynamics and ovulation during the interovulatory cycle of sheep and goats

et al. 2019

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Characterization of the productive performance of Highlander sheep in Southern Chile. I. Female reproductive traits

Cited by 6 publications

References 31 publications

Reproductive performance of postpartum ewes treated with insulin or progesterone hormones in association with ram effect

Reproductive performance of postpartum ewes treated with insulin or progesterone hormones in association with ram effect

Analytical Validation of the IMMULITE® 2000 XPi Progesterone Assay for Quantitative Analysis in Ovine Serum

Effect of bST administration on plasma concentrations of IGF-I and follicular dynamics and ovulation during the interovulatory cycle of sheep and goats

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