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Table 2 Phenotypic correlations among lactation persistency and extended lactation traits

From: Mapping quantitative trait loci (QTL) in sheep. IV. Analysis of lactation persistency and extended lactation traits in sheep

Trait Extended lactation Lactation persistency
  MY PY FY UY LY SCY MY PY FY UY LY
Extended lactation protein -0.18           
Extended lactation fat -0.25 0.67          
Extended lactation useful yield -0.12 0.72 0.69         
Extended lactation lactose -0.06 0.01 0.13 0.08        
Extended lactation somatic cell -0.04 0.62 0.64 0.83 0.08       
Milk persistency 0.88 -0.20 -0.28 -0.12 -0.07 -0.02      
Protein persistency 0.18 0.54 0.45 0.54 0.27 0.59 0.23     
Fat persistency 0.21 0.18 0.28 0.31 0.21 0.31 0.25 0.64    
Useful yield persistency 0.02 0.29 0.42 0.45 0.44 0.39 0.01 0.55 0.51   
Lactose persistency 0.04 0.01 0.11 0.10 0.85 0.09 0.01 0.39 0.36 0.54  
Somatic cell persistency 0.15 0.44 0.46 0.62 0.16 0.78 0.23 0.77 0.59 0.49 0.30
  1. Correlations are shown for lactation persistency and extended lactation of milk (MY), protein (PY), fat (FY), lactose (LY), useful yield (UY) and somatic cell score (SCY) yields. Phenotypic correlations greater than 0.22 are highly significant (P ≤ 0.01), greater than 0.17 are significant (P ≤ 0.05), and smaller than 0.15 are not significant (P ≥ 0.1).