影响母猪养殖之分娩率的因素分析（Analysis of factors affecting parturition rate of sows）.docVIP

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影响母猪养殖之分娩率的因素分析（Analysis of factors affecting parturition rate of sows）.doc

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影响母猪养殖之分娩率的因素分析（Analysis of factors affecting parturition rate of sows）

影响母猪养殖之分娩率的因素分析（Analysis of factors affecting parturition rate of sows） The purpose of the production of sows is to produce piglets of large quantity, great individual and good health. Under the condition that the number of sows is certain, the parturition rate of sows directly influences the production quantity of piglets. Increasing the farrowing rate of sows can increase the production quantity of piglets. 1. The conception of parturition rate. In normal circumstances, the rate of parturition of sows can be calculated by the following methods: Delivery rate (%) = number of sows delivered, number of sows per sow, * 100, according to the average delivery rate of a pig farm, we can understand the efficiency of breeding pigs in this pig farm. What is the acceptable delivery rate index for a pig farm? Is generally believed that the target delivery rate: 85-90% group, 75-85% sows Farrow, 85-95%, 75% new farms. For pigs with high rates of death due to death, illness or lameness, the rate of correction delivery can be used to correct the number of inactive deaths. Corrected delivery rate = number of farrowing sows (number of mating sows - non breeding sows) * 100 Two. Factors affecting the delivery rate A variety of factors that can lead to low birth rates. Generally, low birth rate problem is due to failure caused by the failure of pregnancy or pregnancy. Breeding failure is routine, and pregnancy failure is unconventional. (a) the pregnancy failure is caused by failure to conceive sperm failed to make the exclusion of the fertilized eggs. As shown in Figure 1, many factors can cause the failure of pregnancy. Can be regarded as a failure to conceive after mating 18-24 day or 39-45 day to estrus (conventional return) increased the proportion of sows. The ratio of return to love on the 18-24 day and 39-45 days is about 5:1. The ratio was higher than 5:1, which showed that the identification of oestrus was very good, and most of the first cases were detected. (two) failure