The Prominent Frame Length of Dairy Cattle to Milk Delivery as A Opt Selection Yardstick

Abstract

Body length in dairy cattle is an essential linear trait to thoroughly investigate because cattle's bodies are stretched horizontally, unlike humans. As a result, the current study aimed to identify dairy cattle's most prominent body length characteristics primarily related to milk delivery as a selection basis. One hundred twenty-one heads of Holstein cows were employed as a research sample. The samples were utterly lactating, with ages between 2 and 6 years. Principal component analysis (PCA), correlation, and regression were used consecutively to examine the data. The R type 4.2.1 with RStudio software was applied as an instrument for statistical analysis. A stipulated output of the PCA has unmasked four body length traits as major components, comprising absolute frame lengthiness (AFL), relative frame lengthiness (RFL), rump lengthiness (RML), and fore udder lengthiness (FUL). The correlation and regression analysis designated the FUL as the priority in dealing with the milk delivery characteristic, followed by the long distance between teats side-view (TSL). However, with PCA excluding TSL as a substantial component of body length, the second priority was given to the RFL. The ultimate recommendation is to prioritize the FUL trait for the initial cow selection program. Presumedly, the RFL could be used as the first initiative trait for the calf-heifer selection plan.