Research Progress of Porcine Reproductive and Respiratory Syndrome

Porcine Reproductive and Respiratory Syndrome (PRRS) is caused by Porcine Reproductive and Respiratory Syndrome Virus (PRRSV), which is characterized by sow reproductive disorder and piglet respiratory syndrome. The complex pathogenesis of PPRS includes antibody-dependent enhancement, immune suppression and persistent infection in the body and viral genetic diversity. In order to have a better understanding of the occurrence and prevalence of porcine reproductive and respiratory syndrome in China. The review of PRRS etiology, epidemiology, pathogenesis, genetic variation, diagnosis and control technology and other aspects of the progress were carried out.

Analysis and Countermeasure of Sow’s Postnatal

In the delivery, the sow postpartum non-eating disease is often occurs, once the disease, if not cured, the occurrence of the disease will lead to sows lack of milk or no milk, aff ecting sow and piglets growth and development (for example, Piglets yellow and white diarrhea), more serious and even death, can also lead to sow death or forced to eliminate, aff ecting the normal production and reproduction of the continued, to the pig industry to bring some economic losses. In this paper, the sow postnatal do not eat the careful observation, do the corresponding experiments and records, the system introduced the sow postpartum not eat the performance and impact, and fi nally according to the sow postnatal do not eat the diff erent factors, to take the appropriate countermeasures and Prevention. Through comparison, a more comprehensive comprehensive prevention and control program is obtained.

Determination of IgG in Serum and Egg Yolk of Goose

Immunoglobulin G (IgG) refers to animal protein with antibody activity. In poultry, the mother can pass their own immunoglobulin to the off spring through the egg, and play a protective role for the off spring [20]. In this study, 102 samples of Jilin white goose were tested by ELISA. The IgG content of IgG and goose embryo in egg yolk during the development of goose embryo was tested. The results showed that the IgG content in goose serum and egg yolk was 14.707μg / mL and 3967.62μg / mL at 14.5 days, and 1495.6413μg / mL and 2821.363μg / mL at 34.5 days (3.5 days).

How to Improve the Survival Rate of Milk Calves

As a reserve force for a pasture, calf determines the future of the ranch and the future profi t of the ranch. The calf's scientifi c rearing is the most important part of sustainable development of a ranch. Calf management is a complex and detailed work, breeders need to consider three factors: nutrition, disease, and environment. In order to make calves become a good reserve cattle, it is important to ensure that calves have a balanced, adequate nutrition, reduce calving morbidity, mortality, and a suitable environment. More excellent young cattle can produce more prolific lactation cattle. This article introduce the calf feeding and management work from the feeding and management, environmental management and other aspects.

Pathological Changes of Copper Ion Poisoning in Mice

In this study, the clinical manifestations of copper poisoning and the pathological changes of tissues and organs were observed by copper sulfate. The experimental mice were randomly divided into four groups: control group (0 mg / kg), low dose group (50 mg / kg), medium dose group (100 mg / kg), high dose group (200 mg / kg), 6 rats in each group, the test period was 2 weeks. The results showed that the mortality rate in the high dose group was higher than that in the middle dose group and the low dose group. Pathological observation of high-dose group showed hepatic steatosis and granular degeneration, hepatocyte showed honeycomb appearance, low dose group and middle dose group hepatocyte enlargement, cytoplasm filled with red stained fine particles; low dose group In the renal tubular degeneration, renal tubular epithelial cell swelling, so that the lumen becomes smaller or narrow, interstitial telangiectasia, congestion. In the middle dose group, there were obvious degeneration of the renal tubules, and there were many red dye protein in the lumen. Part of the renal tubular wall cell structure was destroyed. High dose group of renal tubular epithelial necrosis, disintegration, fall off in the lumen. The results show that copper poisoning mainly damage the liver, kidney and other tissues and organs, eventually leading to morbidity and even death.