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m.)
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Qualifying of sheep to enter the flock from the isolation facility: (Appendix 4) | |||
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i.
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Sheep enter isolation for the following reasons: | |||
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(1)
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New purchase from a flock not "A" status. | |||
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(2)
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Return from outside flock (e.g. show, demonstration) where there was exposure to sheep or goats of unknown or lower MV status. | |||
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(3)
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"Suspect" or "non-specific" MV test result. It is strongly recommended that this group be kept separate from new or returning entries as they may only need one test to return to the flock. Otherwise, they will require 2 negative tests to return to the flock. | |||
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ii.
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It is strongly recommended that animals enter the group at one time and that no new animals be added to the group. To do so may jeopardize the status of the group. | |||
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iii.
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All sheep entering isolation from outside the flock must undergo a MV test at entry. | |||
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(1)
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Unless arriving directly from an "A" status flock with no contact of non- "A" status animals. | |||
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iv.
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All sheep in isolation are treated as a group. The status of the isolation group is the same as status of the lowest status animal in the group. | |||
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v.
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An isolation group test must include all sheep in isolation that are greater than and equal to 180 days of age. | |||
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vi.
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If the Isolation Group contains new entries to the flock (i.e. one or more of the animals in the group are new entries) and the Isolation Group Test is negative, | |||
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(1)
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Then the group remains in isolation and must undergo a second group test in 8 to 12 weeks after the initial entry test. Do not add any animals to the group during this time. | |||
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(2)
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If this second isolation group test is negative, there have been no animals added to the Isolation group, then the group is eligible to enter the main flock. | |||
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vii.
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If the Isolation Group is comprised only of animals that originated in the flock and are in isolation because of a previous "suspect" or "non-specific" test and the Isolation Group Test is "negative" then the group may return to the flock after only one group test. | |||
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viii.
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If one or more sheep are found to be positive at any test, | |||
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(1)
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the positive sheep must be removed and their lambs < 180 days of age. | |||
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(2)
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the entire remainder of the group must remain in isolation and be re-tested in 8 to 12 weeks. | |||
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(3)
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If the entire isolation group is then found to be negative on this subsequent test, the group may enter the flock. | |||
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(4)
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If the flock's next test is a random sample (e.g. "A" status or "Monitored-Low Risk"), these sheep must be sampled as well as the random sample. | |||
| TOP |
(a)
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If one or more animals are found to be positive, then the whole flock must be re-sampled in order to be able to achieve "A" status again. | ||
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xi.
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If one or more sheep are found to be "suspect" or "non-specific" on any test and | |||
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(1)
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no other sheep in the isolation group test positive and | |||
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(2)
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upon retest, all suspect and non-specific sheep, test negative then | |||
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(3)
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the group test will be considered a negative test. | |||
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x.
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Sheep that have entered "A" Status Flocks or "Monitored-Low Risk" flocks at subsequent flock tests: | |||
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(1)
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At the time of the next annual random flock test, all sheep which have entered the flock from isolation since the last random test, must be sampled in addition to the randomly selected sheep, regardless of the number of negative tests those former isolation sheep have received. | |||
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xi.
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If lambs are born while the dam is in isolation, | |||
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(1)
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the lamb must be tested and removed as per the protocol set out for the main flock, i.e. | |||
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(a)
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lambs < 180 days of age will not be tested; | |||
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(b)
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lambs born to positive ewes must be removed from the isolation group; | |||
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(c)
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lambs > =180 days must be tested as part of the isolation group. | |||
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(2)
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An exception to this is if a lamb was born to a ewe which tests negative will in isolation. The lamb may be tested as young as 150 days of age for its first test | |||
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xii.
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If all sheep are in isolation as a result of a "suspect" or "non-specific" test, i.e. no positive test results and | |||
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(1)
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The test was a Whole Flock test and | |||
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(2)
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A sheep receives a subsequent "negative" test on the retest within 30 days of the flock test, | |||
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(3)
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That sheep can return to the flock immediately upon receipt of the test. | |||
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xiii.
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Embryo Status: All embryos being implanted in recipients located in the enrolled flock must have either originated from donors located in a Status "A" flock or were handled in accordance with the protocol set out by the International Embryo Transfer Society for the sanitary handling of embryos. | |||
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xiv.
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Semen Status: All semen (fresh or frozen) being used in artificial insemination programs within the flock must have originated from rams located in Status "A" flocks, from countries declared free of Maedi Visna virus infection, or from rams collected in a federally accredited AI Centre (ensuring that they have had at least one negative MV test prior to semen collection). | |||
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