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Twins, triplets - is it the ram or the ewe?

15/12/2011

1 Comment

 
Does the ram make a difference how many twins and triplets he produces? Well, not really. Rams produce 100's of 1000's of sperm, more than enough to produce sextuplets every time, but they don't because it's not up to them.

Twins, triplets or quads are generally the result of multiple ovulation by the ewe. Some ewes produce more than one egg each time they come into heat, and if these make it to term the result is twins, triplets or more. Some breeds are more "prolific" (produce more offspring per ewe) than others, and this trait can be selected and improved by keeping the offspring of ewes that produce twins or triplets.

What role does the ram play? As we've said before, the ram provides 1/2 of the genetics to each lamb. If the ram has twinning in his pedigree, that is if his mother produced many sets of twins or triplets, his father's mother produced twins or triplets, and so on, then chances are very high that his female offspring will also produce twins or triplets. Since rams don't ovulate (produce eggs), we can't measure directly their twinning capability like we can in the ewes where we can see and count how many lambs they produced. So in rams we have to look at their female relatives to make inferences about their genetics for twinning.

If you want to produce twins, you need to keep the female offspring from ewes and rams that have twinning in their pedigrees, and in the case of the ewe that she produced twins regularly.

Another good indicator of twinning potential is early fertility. If a ewe produces her first lamb or lambs when she is a yearling, she is demonstrating early fertility. Many of these will go on to produce twins as 2 or 3 year olds and older. If a ram is born as a single to a ewe lamb, look at her mother to see if she has twinning in her performance history. Also ask about the ram's sire's mother to see if she has twinning in her records.
1 Comment

Will any ram do?

12/12/2011

6 Comments

 
The old saying "you get what you pay for" is certainly true when it comes to rams. Sure, sometimes you can get lucky and pick up a bargain but most of the time if you buy a ram from the saleyards you're buying someone else's rubbish or problems.

The "ram is half the flock" - and this saying is absolutely true. Every lamb gets half of it's genetics from the ram, so it should be at least as good as the ewes and preferably much better. Why? Because to find one good ram is much easier than to find a whole flock of good ewes! Think of it this way; if you have 100 ewes and 100 rams to choose 60 ewes and 2 rams, you'll have to pick at least 10 ewes that are below average but you can get 2 of the best rams!

You can improve your flock by buying good rams that are much better than your ewes and keeping their female offspring as future breeding ewes. If the rams are not much chop the ewes they produce won't be much chop either. Then what?

So get a good ram and you'll produce good lambs, whether it be for eating or breeding. The qualities of a ram for those purposes might differ, but either way it should be a well-bred ram produced by a reputable breeder that backs their claims up with data and pedigrees. 
6 Comments

    Author

    Sue Meszaros

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