Sex of co-twin affects the in vitro developmental competence of oocytes derived from 6- to 8-week-old lambs
Jennifer M. Kelly A C , David O. Kleemann A , Hayley McGrice B , Jose A. Len B , Karen L. Kind B , Will H. E. J. van Wettere B and Simon K. Walker A
+ Author Affiliations
- Author Affiliations
A South Australian Research and Development Institute, Turretfield Research Centre, 129 Holland Road, Rosedale, SA 5350, Australia.
B School of Animal and Veterinary Sciences, University of Adelaide, Roseworthy, Mudla Wirra Road, SA 5371, Australia.
C Corresponding author. Email: jen.kelly@sa.gov.au
Reproduction, Fertility and Development 29(7) 1379-1383 https://doi.org/10.1071/RD16098
Submitted: 29 February 2016 Accepted: 6 May 2016 Published: 2 June 2016
Abstract
Several intrinsic factors (age, genotype, liveweight) influence the reliability of juvenile in vitro fertilisation embryo transfer (JIVET) programs. Limited evidence indicates that variability between lambs is reduced in twin-born lambs. We examined the impact of birth type (single, twin, triplet) and sex of the co-twin (with age, birthweight and liveweight as covariates) on JIVET outcomes. Birth type did not influence any parameter studied. However, blastocysts produced, as a percentage of embryos cleaved or total cumulus–oocyte complexes collected, was higher (P < 0.05) for females born with a female co-twin (67.0 ± 6.1, 57.5 ± 6.0 respectively) compared with those born with a male co-twin (26.9 ± 6.5, 22.3 ± 6.2 respectively; least-square mean ± s.e.m.). Blastocyst rates for lambs born with a male co-twin did not differ significantly from lambs born either as singles (39.5 ± 6.7%, 34.6 ± 6.5% respectively) or triplets (43.1 ± 10.6%, 36.5 ± 10.3% respectively). Other parameters were not influenced by sex of the co-twin. These results are indicative of an enhancement effect of the female co-twin on oocyte development. From a practical perspective, selecting lambs for a JIVET program based on litter size and sex of the co-twin is warranted.
Additional keywords: JIVET, follicle, prepubertal.
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