1 Records created or received by an individual, family or organisation (such as a government, cultural association, company or university) during its existence and selected to be kept permanently because they are considered to be of continuing value to society. 2  Unique and irreplaceable.
In domestic dogs, sexual maturity (puberty) occurs between the ages of 6 to 12 months for both males and females, although this can be delayed until up to two years of age for some large breeds. Pregnancy is possible as soon as the first estrus cycle, but breeding is not recommended prior to the second cycle.
In a purebred herd, use the same sire for the second breeding. Sows can be bred in the post weaning heat if pigs are weaned at 2 weeks of age or older and the sow is not in too thin a condition. Boars should be approximately seven to eight months old before being used in a breeding herd.The boar is considered to be mature at 15 months of age or older. The suggested maximum number of services per boar are listed in Table 1.ows can be bred in the post weaning heat if pigs are weaned at 2 weeks of age or older and the sow is not in too thin a condition. Boars should be approximately seven to eight months old before being used in a breeding herd.