A large number of studies currently believe that at the end of the lactation period, the sow’s weight loss should preferably be controlled within 10 kilograms and its backfat size should be no less than 18 millimeters. This is acceptable because only a small amount of body fluid was used for the sow. Continuous production performance does not cause damage. When lactating sows feed on crude protein and lysine is insufficient, sows will first use muscle tissue to supplement the lack of breast milk. Muscle tissue reduction is an important reason for the continuous production performance of sows. When the lactating sow’s feed energy is insufficient, the sows are the first to use adipose tissue, and both energy and protein deficiency are important reasons for the decline in sow body storage. Lack of nutrient supplementation and poor feed intake in sows do not only result in serious damage to sow stocks, but also result in poor weaning weight. If the first production uses a large number of sow's body reserves, post-natal sow is an important reason for the subsequent decline in continuous production capacity.
A study by the University of Nottingham (Cole and Harker unpublished data) found that when sows fed on first and second-born pigs were fed at a dose higher than 1.93 kg/day, a reduction in feed intake during lactation occurred. The second child was more severe than the first child; when the feed intake during pregnancy increased by 1 kg/day, the lactation feed intake was reduced by 1.48 kg/day for the first child and 2.21 kg/day for the second child.
The author believes that the rearing and management of the sow stage is very important, especially with regard to details and precision. In fact, the good or bad sow feeding and management from the beginning of pregnancy will directly affect the performance of their offspring production levels. The final result of raising pigs is from the start of sow mating, to the completion of the growth of finishing pigs and the management of each accumulation of details, each detail of the error will have an impact on the final result, but also a "details determine the success or failure" of the process.
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