Over the past few decades, gene selection for commercial pig production has resulted in a significant increase in the number of sows born and the weaning survival rate of piglets. Since this is an effective way to increase the productivity of commercial pigs, litter size and survival rate are still regarded as an important feature in the breeding process worldwide. Although increasing litter size can increase production efficiency, it also has the following two adverse effects: (a) sow milk production performance, (b) piglet birth weight and survival rate. The complex process of increasing the adverse effects of raising litter size on sow milk production performance and how Joyce Corporation solves these problems have been discussed in an earlier article.
Another problem with increased litter size is the lower average birth weight of piglets and the increased number of low birth weight piglets, which increases the variation in birth weight. The main reason for this is that, in the process of gene selection, we often focus on increasing the number of ovulation and the survival rate of the embryo, while neglecting the bearing capacity of the sow's uterus. In this article, we will discuss the short- and long-term effects of the low birth weight of piglets, and describe how Joyce is addressing these issues.
Many studies have shown that low birth weight of piglets can reduce the survival rate, and the growth rate during lactation, growth, and fattening is low. Rehfeldt and Khun increased in a 2006 report that pigs born with lower birth weights had lower weight gain and more fat when slaughtered than litters with higher litter weights. They concluded that the growth of muscle fibers in piglets with a lower birth weight reached a plateau earlier than that of piglets with a higher birth weight, and thus more energy in food was deposited in fat. These studies have shown that the low birth weight of piglets can bring economic losses to producers.
Under ideal conditions, the number of litters in sows is high, the number of litters with low birth weight is low, and the uniformity of litters in litters can be reduced, which can reduce birth weight variation. The uniform piglets ease the feeding and management of the sow producing sows, and due to the good performance of the piglet during the growth and finishing stages, the producer's income will be further increased. In summary, the quality and homogeneity of piglets are also worthy of attention, in addition to increased litter size and survival. In addition, in the process of breeding sows, it is also very important to increase the lean meat percentage of piglets to compensate for the impact of low birth weight.
In order to increase the revenue of customers, Jiayu Company has invested heavily in the process of improving the quality of piglets. We realize that it is very important for the weight of piglets to be controlled mainly by sows, and that we understand that birth weight and individual relationships are also very close. In recent years, the birth weight of single piglets in sows (including dead piglets) has become a routine record item, which is important for understanding and definitively raising the birth weight of piglets and reducing birth weight variation, as well as maintaining an acceptable initial litter weight. .
The most direct effect of improving piglet quality is to increase the weaning survival rate of piglets. It is important to understand the relationship between piglet survival and birth weight. The company defined the survival rate of piglets from three time points, firstly the prenatal/productive survival rate, ie the number of non-fetal deliveries; the second is the early survival rate, ie the piglets surviving more than 24 hours; the last one is Weaning survival rate, ie the number of survivors from birth to weaning. Prenatal/production survival and early survival rates were affected by litter size and litter weight. Thus, the selection of genes for these traits can help us to improve the piglet's viability and get bigger and more uniform piglets. Understanding the genes that control the birth weight and survival rate of piglets and the relationship between them and the application of gene selection methods can effectively improve the above two traits. Plus customers of the company's weaned piglets will be larger and more uniform. So get higher profits.
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