The gilt is a new force in the follow-up production of the farm. The quality of the gilt production and management directly affects the supplementation of the basic sow, thus directly affecting the production of the pig farm. Managing well-stocked sows has important implications for the profitability of pig farms. This paper attempts to reveal whether there is a problem with the management of a gilt sow on the farm by examining the relationship between gilts and basic sows. In a sense, this is a method of diagnosing and analyzing the problem of gilt management from the perspective of population. The gilts mentioned here refer to the sows that were selected into the reserved sow herd at the age of the gilt and transferred to the basic sow group after confirming breeding at 10 months of age. Therefore, a gilt is a non-pregnant sow that is between the months of age and 10 months of age. If it has not been bred, it will remain in the gilt group, or it will be confirmed that it cannot be eliminated after use. The gilts that are normally bred are calculated on a monthly basis for months or so. The research on the contribution of gilts to basic sows is mainly based on the following objectives: Whether long-term sows stay in this group for a long time and invalid feeding time is formed. Timely management of gilts to reduce ineffective feeding time and avoid economic losses. This study is based on a study of gilt populations for each individual condition in the gilt population to identify problems in the gilt population. To study this issue, the following basic data must be clearly understood: Number of gilts at the beginning of the period Number of gilts at the end of the period Number of gilts transferred (increase) Number of gilts purchased (increase) Number of gilts transferred (reduced, transferred to basic Number of sows) Number of gilts culled (decrease) Number of gilts dying (decrease) Number of gilts total feeding days during the study period Duration of gilf contribution Grass-sheets We assume a study period of one year, daily The average number of gilts reared is equal, the proportion of culls and deaths is the same (set at 20%), and the assumption is that gilts increase monthly, and the monthly increase is also equal. Assuming that there are 100 gilts at the beginning of the period, the result will be a balanced increase every month. Then, at the beginning of the month, there will be 100 gilts. According to the definition of gilts, 25 new gilts will be needed in the middle of the month, 20 basic gilts will be transferred, and the number of deaths will be eliminated. At the end of the month, there will be 100 gilts (ie, At the beginning of the month, there were 100 gilts on hand, and so on, forming the aforementioned table. As can be seen from the table, 25 gilts are selected for monthly retention, and the number of sows is kept at 100, and 240 basic sows can be added each year. If the sow’s replacement rate is 30%, the sow’s size will be 720. For a farm with a total of 600 sows, it will be updated 30% per year. That is to say, 180 basic sows need to be added and 225 gilts be reserved for supply. On average, 19 gilts will be transferred each month and 15 Reserve sows (transferred to 15 basic sows). If we use the number of gilts raised per year as the denominator, the total number of gilts transferred to the basic sow group is used as the numerator. The ratio can be defined as the contribution of gilts to the basic sow group (abbreviated as Contribution to gilts). Based on the above conditions, each gilt will contribute 2.4 basic sows per year. From this, we can use the actual situation on the farm and compare the above conditions to investigate the contribution of gilts. If a farm gilding total breeding day is 41681 days, the average number of gilt stocks to be reared per day is 114, and the number of sows entering the basic sow group is 146, and the gilt contribution is 146. /114 = 1.28, which is much less than the standard value of 2.4 heads. Then we can think that the gilded herds in the field are too big for feeding days. If the total feeding day for a gilt sow on a farm is 35925 days, the average number of breeding gilts per day is 99, and the number of basic gilts transferred is 258, and the gilt contribution is 258/99 = 2.61, which is greater than the 2.4 standard, then we can think that the gilts have a low feeding day. And the replacement sow breeding date is earlier than the standard mating time months. The field has a higher gilt production level. This evaluation is based on the above assumptions. In fact, the number of gilts at the beginning and end of the trophy is not equal, and the gilt increase and increase time are not balanced. The gilt herd ineffective feeding day was also related to factors such as the status of the gilt at the beginning and end of the period, the status of transferred gilts purchased, and the status of the gilts purchased, transferred out, culled, and the condition of the gilt dying. However, it does not affect the gilt contribution as a method for investigating and diagnosing the problem of gilts.
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