Can we increase the proportion of female lambs by feeding oats at joining?

Edward H Clayton, John Wilkins, Belinda King, RJ Meyer, Michael Friend

Research output: Book chapter/Published conference paperConference paper

Abstract

The proportion of female lambs was previously found to be higher when ewes were fed a diet based on oat grain and cottonseed meal (CSM) high in omega-6 fatty acids at joining. These results have now been confirmed in a number of studies, both with Border Leicester x Merino ewes and Merino ewes. The current paper presents results from the latest experiments conducted at the Wagga Wagga Agricultural Institute and further details of possible mechanisms underlying the observed effects. The time to lambing was significantly shorter when ewes were fed a diet high in omega-6 compared with omega-3 at joining. The shorter time to lambing appeared to be greatest when ewes were fed the high omega-6 diet both pre- and post-joining. In addition, the difference in the sex ratio between ewes fed a diet high in omega-3 or omega-6 fatty acids also appeared to be greatest when ewes were fed pre and post-conception. Additional research is required in order to determine the optimal amount of omega-3 or omega-6 to feed to ewes at joining in order to maximise the effect of maternal nutrition on the sex ratio of lambs.
Original languageEnglish
Title of host publicationGSSA 2013
Subtitle of host publicationLearn, Adopt, Prosper
Pages97-102
Number of pages6
Publication statusPublished - 2013
EventGrassland Society of Southern Australia (GSSA) Annual Conference - Soldiers, Sailors and Airmen’s (SS&A) Club, Albury, Australia
Duration: 16 Jul 201318 Jul 2013

Conference

ConferenceGrassland Society of Southern Australia (GSSA) Annual Conference
Abbreviated titleLearn, Adopt, Prosper
CountryAustralia
CityAlbury
Period16/07/1318/07/13

Fingerprint

oats
ewes
lambs
omega-6 fatty acids
lambing
Merino
diet
sex ratio
Border Leicester
maternal nutrition
cottonseed meal

Cite this

Clayton, E. H., Wilkins, J., King, B., Meyer, RJ., & Friend, M. (2013). Can we increase the proportion of female lambs by feeding oats at joining? In GSSA 2013: Learn, Adopt, Prosper (pp. 97-102)
Clayton, Edward H ; Wilkins, John ; King, Belinda ; Meyer, RJ ; Friend, Michael. / Can we increase the proportion of female lambs by feeding oats at joining?. GSSA 2013: Learn, Adopt, Prosper. 2013. pp. 97-102
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Clayton, EH, Wilkins, J, King, B, Meyer, RJ & Friend, M 2013, Can we increase the proportion of female lambs by feeding oats at joining? in GSSA 2013: Learn, Adopt, Prosper. pp. 97-102, Grassland Society of Southern Australia (GSSA) Annual Conference, Albury, Australia, 16/07/13.

Can we increase the proportion of female lambs by feeding oats at joining? / Clayton, Edward H; Wilkins, John; King, Belinda; Meyer, RJ; Friend, Michael.

GSSA 2013: Learn, Adopt, Prosper. 2013. p. 97-102.

Research output: Book chapter/Published conference paperConference paper

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AU - Meyer, RJ

AU - Friend, Michael

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N2 - The proportion of female lambs was previously found to be higher when ewes were fed a diet based on oat grain and cottonseed meal (CSM) high in omega-6 fatty acids at joining. These results have now been confirmed in a number of studies, both with Border Leicester x Merino ewes and Merino ewes. The current paper presents results from the latest experiments conducted at the Wagga Wagga Agricultural Institute and further details of possible mechanisms underlying the observed effects. The time to lambing was significantly shorter when ewes were fed a diet high in omega-6 compared with omega-3 at joining. The shorter time to lambing appeared to be greatest when ewes were fed the high omega-6 diet both pre- and post-joining. In addition, the difference in the sex ratio between ewes fed a diet high in omega-3 or omega-6 fatty acids also appeared to be greatest when ewes were fed pre and post-conception. Additional research is required in order to determine the optimal amount of omega-3 or omega-6 to feed to ewes at joining in order to maximise the effect of maternal nutrition on the sex ratio of lambs.

AB - The proportion of female lambs was previously found to be higher when ewes were fed a diet based on oat grain and cottonseed meal (CSM) high in omega-6 fatty acids at joining. These results have now been confirmed in a number of studies, both with Border Leicester x Merino ewes and Merino ewes. The current paper presents results from the latest experiments conducted at the Wagga Wagga Agricultural Institute and further details of possible mechanisms underlying the observed effects. The time to lambing was significantly shorter when ewes were fed a diet high in omega-6 compared with omega-3 at joining. The shorter time to lambing appeared to be greatest when ewes were fed the high omega-6 diet both pre- and post-joining. In addition, the difference in the sex ratio between ewes fed a diet high in omega-3 or omega-6 fatty acids also appeared to be greatest when ewes were fed pre and post-conception. Additional research is required in order to determine the optimal amount of omega-3 or omega-6 to feed to ewes at joining in order to maximise the effect of maternal nutrition on the sex ratio of lambs.

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Clayton EH, Wilkins J, King B, Meyer RJ, Friend M. Can we increase the proportion of female lambs by feeding oats at joining? In GSSA 2013: Learn, Adopt, Prosper. 2013. p. 97-102