PRRS exists in two distinct forms, reproductive and respiratory, and infected farms may experience one or both. A variety of factors, including swine genetics, the specific PRRS virus variants in the herd, health status of the herd, ages of the animals involved, and pregnancy status, may influence the clinical signs.
8495 Karma. 1. Silicon is a metal and oxygen is a non metal hence it will form both ionic and covalent bonds, pauling principle explains the ratio in detail.Was this answer helpful?495 Karma. 1. Silicon is a metal and oxygen is a non metal hence it will form both ionic and covalent bonds, pauling principle explains the ratio in detail.
Two nonmetals = covalent   metal + nonmetal= ionic   Therefore sodium oxide is formed by ionic bonds, as sodium is a metal and oxygen is a non-metallic element.9 people found this useful.itrogen oxide is a covalant compound because it is made up of two non-metals nitrogen and oxygen and it forms the bond by sharing electrons. 1 person found this useful.