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Livestock & Forage
Lambing ease gestation length
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<blockquote data-quote="Global ovine" data-source="post: 8097540" data-attributes="member: 493"><p>Yes. Gestation length and birth weight are highly correlated in both sheep and cattle. Same for birth weight and ease of birth, hence breeding lines selected against birth difficulties (history shows this is generally how it is done) have shorter gestation hence lighter birth weights, as well as physical differences such as wedge shape lambs/calves and dam's pelvic aperture and innate vigour.</p><p></p><p>Mean lambing dates between same breed sires joined with ewes at the same time can vary by 5 days if not previously selected on anything related to birthing difficulties if not related. Likewise sires from different breeders can vary by a similar magnitude if a breeder has put emphasis on easy birthing while the other have not, irrespective of breed name. </p><p></p><p>One older NZ Texel ram had outstanding Lamb Survival figures and was exported to the UK. The exporter claimed his progeny were born 4 days ahead of other sires as he was an AI donor sire. Lamb vigour soon makes up for the kilo of extra birth weight when much of the birth trauma is eliminated by slipping out easier.</p></blockquote><p></p>
[QUOTE="Global ovine, post: 8097540, member: 493"] Yes. Gestation length and birth weight are highly correlated in both sheep and cattle. Same for birth weight and ease of birth, hence breeding lines selected against birth difficulties (history shows this is generally how it is done) have shorter gestation hence lighter birth weights, as well as physical differences such as wedge shape lambs/calves and dam's pelvic aperture and innate vigour. Mean lambing dates between same breed sires joined with ewes at the same time can vary by 5 days if not previously selected on anything related to birthing difficulties if not related. Likewise sires from different breeders can vary by a similar magnitude if a breeder has put emphasis on easy birthing while the other have not, irrespective of breed name. One older NZ Texel ram had outstanding Lamb Survival figures and was exported to the UK. The exporter claimed his progeny were born 4 days ahead of other sires as he was an AI donor sire. Lamb vigour soon makes up for the kilo of extra birth weight when much of the birth trauma is eliminated by slipping out easier. [/QUOTE]
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Lambing ease gestation length
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