Introduction In beef cattle production systems, the word temperament is used to describe the fear-related responses of cattle to human interaction. Cattle may display poor temperament for a variety of reasons, some of which may include; 1) genetic disposition, 2) previous handling experiences, or 3) fear of a new or novel occurrence or interaction. For reasons related to animal well-being and h...

genetic trend for production traits were estimated in iranian holstein cattle using the first lactation data recorded by cattle breeding and dairy product improvement center of the state from 1991 to 2006. effect of some factors on genetic trend was investigated using data from 18 large herds. (co) variance components and genetic parameters were estimated, using five trait animal model and em-a...

Wheat, oats, barley, rye, rice, and millet are all considered small grains. These small grains are carbohydrate and vitamin rich and have become food staples for humans and animals worldwide. Small grains have been cultivated by man for thousands of years and through selective breeding, they have become one of the most productive crops grown by man. Small grains have been adapted to grow in nea...

Dairy cattle breeding programs have been based in the selection for traits related to milk production. In this research a data set of 63 herds of East Azerbaijan province Holstein cattle, collected during 2002-2013 by the Iranian Animal Breeding Center was used to estimate the repeatability and heritability of three traits of economic importance. Genetic parameters for first three lactations of...