JD-Kid
Member
- Location
- Akaroa.. New Zealand
some intresting reading and might answer the age old question always seem to get alot of ram lambs or ewe lambs
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yea I got me thinking and @Global ovine has some points im thinking of
we scan and record our ewes so know who are the top scanners and who's at the bottom of the list now im thinking
top ewes try and set up for higher ewe lambs
med and lower ones set up for more male lambs
idea being use best rams over less ewes with higher lambing leading to higher input of better geans in ewe flock
lower ones more males so higher weaning weight and faster growth
a vet looked at the paper and said the diffrence in feed is not a huge amount but it is showing that something is going on to change the sex of the lambs
paddocks with plants that are higher in Ca Mg and drenched with ADE or injected 4-6 weeks pre mating hopefully will life ewe lamb numbers
poorer paddocks and grasses with lower Ca Mg. high Na K might lift male numbers
have a tow and fert so could apply some min's to preload the grasses
also sent a copy of paper to a vet at uni I have had dealings with in the past to see what she thinks maybe a student would take it up and do a trial on grass management to change sex out come of off spring
Anyone care to interpret the results for simpletons such as myself? Calcium and magnesium via bolus at what stage during season?
Anyone care to interpret the results
Yes, through the X and Y chromosomes. This work is aimed at helping or hindering one or the other to achieve the desired result ( a bit like altering uterine pH in other studies).is it not the sperm which determines gender?
makes yer wonder if people using sexed semen for dairy cows have a higher % of drys if cows on a higher Na K and P diet or a few strong swimmers still get to there targetYes, through the X and Y chromosomes. This work is aimed at helping or hindering one or the other to achieve the desired result ( a bit like altering uterine pH in other studies).
would just do a few to see if it has that efect hate it to go side ways ...It seems they were feeding an 18% protein feed to all 3 groups with adjustments to the trace elements for each group.
Unusual for concentrates to be fed to flush ewes here ( maybe not in Saudi Arabia??)
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It doesn't say (unless I missed it) how much they were feeding but let's 'guess' at say, 0.5kg/hd/day.
So, for female pre-selection, as a daily intake, they were getting 1.2% Ca = 6g (which would be about 15g of something like calcium carbonate) and 0.35% Mg = 1.75g (which would be about 6.25g of something like magnesite).
I'm guessing that those types of daily intakes (assuming I've got the maths right) are going to rule out boluses.
They also got 4 IU/g of Vit. D (double the male pre-selection ration and 30% more than the control ration).
Looks like we need some pre-tupping tubs that have Ca, Mg and Vit. D if we're not going to flush ewes with concentrates.
think the efect might need to be more than 2 weeks thats were pre loading grass lands might be worth doing or select paddocks early for diffrent breeding outcomes and graze ewes on them depending on what outcome wantedWe need to know first of all if a bolus is feasible, and if there is a better way of manipulating the mineral balance.
Maybe just spread Magnesian Lime a week or two before the tups go out.
I'm keen to try it.would just do a few to see if it has that efect hate it to go side ways ...
could become a bit of a game changer if the efect can be made to work tho
farmers targeting better use of rams and also lambs to sell
even studs if ram sales there main driver could set ewes up for males or if wanting to put a better ram in to the ewe flock could target ewes to breed ewe replacements
This definitely does track with my observations with bovines - we didn't use sexed semen, but was advised to keep open cows away from "the irrigator paddocks" until after the bulls were in and AI had finished.makes yer wonder if people using sexed semen for dairy cows have a higher % of drys if cows on a higher Na K and P diet or a few strong swimmers still get to there target
Best sprinkle a bit of limestone flour in those buckets tooVery interesting. Might have a little experiment myself, I have a batch of 10 heifers I'm going to AI in March/April so I think I will offer them high mag buckets as opposed the standard mineral buckets. Be interesting to see if it results in more heifer calves.