(1) the exterior of mothball sow chooses a level. Sow breast is effective nipple 6 pairs of above, the left and right sides distributings equably in couples, tit span should equal, tit growth is good root of end of; pussy ministry is taller, big and prolapse is good (the genital official development that becomes warped on small area often undesirable) ; back is strong (back small push without using one's hands) able-bodied; sees; limb on the whole expression of behavior of trends of very hale; is appetite exuberant, the action is quick, devouringly eager to do well in everything.
(2) enough life space. If enough circle abandons a condition, answer to provide enough life space to mothball sow, mothball sow subgroup is raised and swarm raises oestrus age to do not have a difference, but former the 1st gravid oviposit rate, embryonic number and brood of vivid young animal is produced first number should compare latter tall.
(3) weight control. In use as formally breed is planted before the pig, should make sure the sow has foot of ripe age, body, reach the sexual maturity on physiology, this are very important. Likewise important is, when matching first, the lean lean inside body and adipose reserves must reach moderate level. The tradition is an affection of view sow fat, back fat determines now appearance gains ground more and more, the fat that use a back determines appearance is more accurate than eye view, more objective. When matching first, sow weight at least due 125kg, the ply back fat that P2 nods at least 16~20mm, ought to be oestrus 2 at least, or later. On the other hand, heavy panel of fat of the back when hybridization (> 25mm) can increase a sow to pass old machine rate in the weight when childbirth. Compare with thinner sow photograph, the sow with overweight weight can add the operation difficult, childbirth difficulty and press dead piggy incident to happen. In lactation, the sow with overweight weight collects appetite to decrease, bring about secrete to breed the quantity is reduced, loss of the weight inside lactation increases. Apparent, with respect to mothball sow, weight is too light overweight perhaps after be opposite, the development of progenitive function is harmful. The body of the requirement when matching first besides the condition is ply back fat in 16-20mm. To achieve this requirement, be necessary to adopt a few measure to control the sow grows and body condition. Before mothball sow weight achieves 50kg, the raise that very rare evidence shows to its raise feeds means and commodity flesh swine is fed what differs. But if this period is serious the progenitive function that hidebound meeting will come to to the sow causes ill effect. Raise 50~80kg mothball sow main goal is the growth that makes lean lean is organized speed is achieved optimal. Raise by this kind of means, the animal grows rate is rapid, facilitating appraisal and choose leave kind of used sow, ensure the animal happens without undesirable symptom, make the sow achieves body condition requirement when be close to body to mature.
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