If there is a nutritional / environmental / hormonal factor which influences lamb gender then I would be interested to know what that is.
I understand that the above factors all have a bearing on fertility/ productivity as in how many lambs the ewes carry, along with breed of course but as a person who sells pure breed ram lambs as breeding tups I do hear all sorts of stories and "old wives tales" designed to deter purchasers from using young rams.
I's nice to hear a few stories going round in support of young rams, even if they are a load of rubbish. I wonder if the negative "wisdom" that hear about young males could possibly be spread by someone desperate to palm off a newbie with their old stock........
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