HOW TO USE THIS ONLINE MAGAZINE
by clicking the arrows at the side of the page.
by clicking anywhere on the page. A slider will appear, allowing you to adjust your zoom level.
and move the page around when zoomed in by dragging the page.
and return to the original size by clicking on the page again.
by entering text in the search field and click on "In This Issue" or "All Issues" to search the current issue or the archive of back issues
a PDF of this magazine.
by clicking on thumbnails to select pages, and then press the print button.
a page via email, Facebook, Twitter and more.
TO VIEW PREVIOUS EDITIONS
, click the
button at the bottom of the screen.
Beyond the Bale : March 2019
50 ON FARM NUMBER OF LAMBS PER SIRE REVEALED BY DNA TESTS Research associated with the Merino Lifetime Productivity (MLP) project has revealed significant differences in the number of lambs per sire in syndicate joinings. How these differences vary between joinings is now being explored as this may have implications for sire management and selection. AWI and the Australian Merino Sire Evaluation Association (AMSEA) have teamed up with five sire evaluation sites to deliver the MLP Project 2015-25. The project is designed to capture lifetime data across diverse environments and Merino types to help better understand and deliver Merino ewe lifetime performance outcomes for the Australian Merino industry. This will include developing a better understanding of what can be done to improve selection at young ages for lifetime Merino ewe productivity. The vast volume of data being collected through MLP also provides an unprecedented opportunity for additional research into reproductive phenomena such as sire dominance. Central to the MLP project are the 5,500 F1 ewes that have been bred through artificial insemination (AI) using 135 industry sires. These 5,500 F1 ewes will be syndicate joined 4-5 times during the life of the MLP project. DNA parentage is being used to identify the sire and dam of their F2 progeny with the aim to generate repeat reproduction records. Early DNA parentage results of the F1 ewe joinings has occurred at three of the five sites to date and show that, within a syndicate, there are often rams that sire a large number of lambs and others that sire very few lambs. Research previously undertaken by MerinoLink and co- funded by AWI showed that when the same syndicate was joined for a second time, the dominance patterns can change. The three pie charts to the right from the MLP project show the percentage of progeny per sire from maiden joinings at Balmoral (the 2015 drop F1 ewes in the 2017 joining) with a joining percentage of 1.9%, and MerinoLink and Pingelly (the 2016 drop F1 ewes for the 2018 joining) both with a joining percentage of 2.3%. In 2018, the Balmoral site rejoined eight of the same 11 rams used the previous year to the same 2015 drop ewes. Three rams from the previous year were unavailable and one new ram was added. The chart below suggests that sire A, the outstanding ram from 2017, is again a dominant ram the following year producing 101 lambs compared to sire H who only produced 6 and 17 progeny. The above figures demonstrate the disproportionate contribution of dominant (high serving capacity and fertile) sires relative to other sires within a syndicate. Of particular note is the sire at Balmoral who produced 33% of the progeny in 2017 amounting to 164 lambs, compared with only six lambs by another sire in the syndicate. 33% 12% 9% 9% 9% 7% 7% 6% 4% 2%1% 8% 18% 20% 7% 7% 13% 9% 9% 9% 14% 14% 24% 19% 1% 1% 2% 25% Balmoral 2017 F2 Lambs Per Sire Range: 6 - 164 lambs Pingelly 2018 F2 Lambs Per Sire Range: 27 - 75 lambs Merinolink 2018 F2 Lambs Per Sire Range: 3 - 88 lambs Balmoral 2015 Drop F1 – Portion of F2 Lambs Per Sire (2017 Versus 2018) 35% 30% 25% 20% 15% 10% 15% 5% A B C D E F G H I J K L 2017 2018
In the Shops - March 2019