In an editorial entitled "PI Blood Group, Pigeon Antigens, and Respiratory Disease" in the December 1976 issue (Chest 70:694, 1976), I suggested that individuals without the P, antigen (P, blood phenotype) may have a greater risk of respiratory disease and that this hypothesis should be tested among individuals selected for respiratory disease, rather than for handling of birds. In their reply ...

ABSTRACT Genetic selection for improved feed efficiency in dairy cattle has received renewed attention over the last decade to address needs of a growing global population. As milk yield is critical component metrics animals, our objective was evaluate associations between primiparous Holstein and parameters mathematical model describing individual lactation curves. The Dijkstra curve ...

In an editorial entitled "PI Blood Group, Pigeon Antigens, and Respiratory Disease" in the December 1976 issue (Chest 70:694, 1976), I suggested that individuals without the P, antigen (P, blood phenotype) may have a greater risk of respiratory disease and that this hypothesis should be tested among individuals selected for respiratory disease, rather than for handling of birds. In their reply ...

With the Weihenstephan funnel nest box, 12 laying hen flocks were tested for their individual laying performance, egg quality, and nesting behavior in a noncage environment. During the whole observation period of 8 yr, a transponder-based data recording system was continuously improved and resulted in a recording accuracy of 97%. At peak production, heritabilities for the number of eggs laid ar...

Group-living species frequently pool individual information so as to reach consensus decisions such as when and where to move, or whether a predator is present. Such opinion-pooling has been demonstrated empirically, and theoretical models have been proposed to explain why group decisions are more reliable than individual decisions. Behavioural ecology theory frequently assumes that all individ...