A government-owned slaughterhouse which has been closed since last week following Hong Kong’s second case of African swine fever will resume operations on Thursday, with the added measure of having all pigs on site slaughtered by the end of the day to guard against the disease.The Food and Environmental Hygiene Department on Wednesday completed cleansing and disinfection work at Sheung Shui slaughterhouse and its services would resume, a government spokesman said. It was shut for five days…