A Proposed Selection Index for Jersey Cattle in Zimbabwe

Table 1

Reduction in the accuracy of the subindex, compared to the total index (𝐼_𝑇), when individual or some criteria(s) were dropped from the index.

	𝐼𝑇	Criteria
		M	𝐹	P	𝐹%	𝑃%	SCC	F% and P%	F%, P%, and SCC
𝑟^2𝐻𝐼	0.911	0.517	0.533	0.529	0.893	0.907	0.868	0.835	0.871
Reduction	—	0.394	0.378	0.382	0.018	0.004	0.043	0.076	0.040

𝐼_𝑇: total Index, M: milk yield, F: fat yield, P: protein yield, F%: fat percent, P%: protein percent, SCC: somatic cell count, and 𝑟²_𝐻𝐼: index accuracy.