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Low input sheep trials NZ ,
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<blockquote data-quote="Global ovine" data-source="post: 7671874" data-attributes="member: 493"><p>I dare say there are many more factors than temperature, but lung irritants opens a whole new book of candidates, from silica crystals in dust, pollens, fungal spores, etc. through to combinations of any of these.</p><p>I think the answer is not so much identifying all the irritants, but preventing the sheep from heavy breathing by walking them rather than having them running, especially up hill, therefore sucking irritants to the bottom of their lungs.</p><p>In the deep south where covered yards are necessary, good cross ventilation is essential as ammonia is very corrosive on delicate lung tissue enabling the normally benign "bugs" to invade and cause this disease. Again, the complexity of this disease in NZ means the commonly used pneumonia vaccines from the UK proved very inadequate in NZ.</p><p></p><p></p><p></p><p>The main buyers of Beltex are using them in cross breeding or to introgress extra meat yield into other breeds. The NZ prime lamb industry's profitability depends more on growth rate than meat yield.</p><p>There is one dominant stud flock that also produces numerous breed crosses and several with very small numbers of pures. Texel throat is an infection of the larynx, not the lungs. I have heard comments that they cannot be pushed by huntaways or you end up carting them, not driving them to their destination. More a matter of awkward mobility.</p></blockquote><p></p>
[QUOTE="Global ovine, post: 7671874, member: 493"] I dare say there are many more factors than temperature, but lung irritants opens a whole new book of candidates, from silica crystals in dust, pollens, fungal spores, etc. through to combinations of any of these. I think the answer is not so much identifying all the irritants, but preventing the sheep from heavy breathing by walking them rather than having them running, especially up hill, therefore sucking irritants to the bottom of their lungs. In the deep south where covered yards are necessary, good cross ventilation is essential as ammonia is very corrosive on delicate lung tissue enabling the normally benign "bugs" to invade and cause this disease. Again, the complexity of this disease in NZ means the commonly used pneumonia vaccines from the UK proved very inadequate in NZ. The main buyers of Beltex are using them in cross breeding or to introgress extra meat yield into other breeds. The NZ prime lamb industry's profitability depends more on growth rate than meat yield. There is one dominant stud flock that also produces numerous breed crosses and several with very small numbers of pures. Texel throat is an infection of the larynx, not the lungs. I have heard comments that they cannot be pushed by huntaways or you end up carting them, not driving them to their destination. More a matter of awkward mobility. [/QUOTE]
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