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Abstract

The aim of this study was to evaluate the reproductive impact of a short-term protein supplementation on a long interval prostaglandin-based protocol (two PG injections 15 d apart; PG15) for timed artificial insemination in sheep. During the breeding season, 437 multiparous Merino ewes grazing...

Author(s)
Errandonea, N.; Fierro, S.; Viñoles, C.; Gil, J.; Banchero, G.; Olivera-Muzante, J.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2018, 114, pp 34-39
Abstract

Reproductive wastage is a key issue for sheep producers, both regionally and globally. The reproductive output of farm animals can be influenced by physiological and environmental factors. Rapid and reliable quantification of physiological stress can provide a useful tool for designing and testing...

Author(s)
Narayan, E.; Sawyer, G.; Parisella, S.
Publisher
Public Library of Sciences (PLoS), San Francisco, USA
Citation
PLoS ONE, 2018, 13, 1, pp e0191961
Abstract

Different therapeutic strategies have been used with the objective of improve luteal function to reduce embryonic losses. The objective of this work was to study the effect of the administration of GnRH or hCG at Day 4 post fixed time artificial insemination (FTAI) on reproductive efficiency in...

Author(s)
Fernandez, J.; Bruno-Galarraga, M. M.; Soto, A. T.; Sota, R. L. de la; Cueto, M. I.; Lacau-Mengido, I. M.; Gibbons, A. E.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2019, 126, pp 63-67
Abstract

Background: Artificial insemination (AI) can serve as a powerful tool to the sheep owners for making rapid genetic progress of their flock. The AI in sheep is mostly performed using fresh semen with two reasons (i) lambing rate following trans-cervical AI with frozen semen is limited by the...

Author(s)
Davendra Kumar; Naqvi, S. M. K.
Publisher
BioMed Central Ltd, London, UK
Citation
Journal of Animal Science and Technology, 2014, 56, 8, pp (24 July 2014)
Abstract

The objective of this study was to investigate the effects of freezing rate on plasma membrane (PM) phospholipids and the function and fertilization of ram spermatozoa during freezing. Semen was obtained from 10 Merino rams using an artificial vagina, diluted with glucose-egg yolk buffer, and...

Author(s)
Fang Yi; Blair, H.; Zhong RongZhen; Sun HaiXia; Zhou DaoWei
Publisher
Elsevier B.V., Amsterdam, Netherlands
Citation
Small Ruminant Research, 2016, 139, pp 46-51
Abstract

In 1990, two selection lines of Merino sheep were established for low and high behavioural reactivity (calm and nervous temperament) at the University of Western Australia. Breeding records consistently showed that calm ewes weaned 10% to 19% more lambs than the nervous ewes. We hypothesise that...

Author(s)
Lier, E. van; Hart, K. W.; Viñoles, C.; Paganoni, B.; Blache, D.
Publisher
Cambridge University Press, Cambridge, UK
Citation
Animal, 2017, 11, 7, pp 1196-1202
Abstract

The aim of the present study was to evaluate the effect of serum progesterone concentrations during the superstimulatory treatment of the first follicular wave on fertilization rate and embryo development in sheep. A total of 71 Merino ewes received a superstimulatory FSH treatment during Wave 1 of ...

Author(s)
Cuadro, F.; Santos Neto, P. C. dos; Pinczak, A.; Barrera, N.; Crispo, M.; Menchaca, A.
Publisher
Elsevier B.V., Amsterdam, Netherlands
Citation
Animal Reproduction Science, 2018, 196, pp 205-210
Abstract

We determined the effect of GnRH or hCG treatment on day 4 post-time artificial insemination (FTAI) on the formation of accessory corpora lutea (acc-CL) and on the concentration of serum progesterone (P4) in sheep. Multiparous adult Merino ewes (n=36) were synchronized for estrus using double...

Author(s)
Fernandez, J.; Bruno-Galarraga, M. M.; Soto, A. T.; Sota, R. L. de la; Cueto, M. I.; Lacau, I. M.; Gibbons, A. E.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2018, 105, pp 184-188
Abstract

The financial impact of early embryonic loss in Australia may be as high as $137 million AUD/year. Embryos may be lost due to environmental conditions, or maternal factors such as nutrition or progesterone (P4) profiles. However, studies on the supplementation of P4 during early pregnancy have...

Author(s)
Rickard, J. P.; Ryan, G.; Hall, E.; Graaf, S. P. de; Hermes, R.
Publisher
Public Library of Sciences (PLoS), San Francisco, USA
Citation
PLoS ONE, 2017, 12, 8, pp e0183659
Abstract

Elevated intakes of protein and energy may increase embryo mortality, but it is not clear whether fresh lucerne (Medicago sativa) pasture poses a risk. A two-year pen study using oestrous synchronised and artificially inseminated Merino ewes (n=175 in 2013 and 215 in 2014) evaluated whether feeding ...

Author(s)
Robertson, S. M.; Clayton, E. H.; Morgan, B.; Friend, M. A.
Publisher
Elsevier B. V., Amsterdam, Netherlands
Citation
Animal Reproduction Science, 2015, 158, pp 75-85

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