1. Empty sows refers to sows that are pre-seed after weaning. The level of feed nutrient levels and protein levels have important implications for the normal estrus of empty sows.
2. In order to supplement the loss of body weight during breastfeeding, empty sows prior to breeding should be fed with enough lactating sows to restore body condition and promote development as soon as possible.
3. According to the body condition, sows who are too thin should add extra material, because when the sow is too thin, body fat accumulation is not much, their growth can not meet, affect the normal heat, eventually leading to shorten the useful life.
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