Some aspects of machine milking rate

Publisher Website
Google Scholar
Abstract
Summary: A study was made of the machine milking rates of a sample of Jersey cows comprising daughter-dam pair groups, obtained from thirteen New Zealand herds during mid-lactation.Twenty-one per cent of the variation in maximum rate of flow occurred within herds and the remainder between herds. Differences in the type of preparation of cows for milking did not have a significant effect on the average milking rates for herds. The variance in milking time between cows within poorly prepared herds was greater, however, than that in the better prepared herds.Heritability estimates for maximum rate of flow, derived from the regression of daughters' records on dams' records, were found to be of the order of 80%.