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Table 2 Heritability estimates of FT-MIR predicted milk processability traits (h2), and their genetic correlations (ra) with measured traits

From: The evolving role of Fourier-transform mid-infrared spectroscopy in genetic improvement of dairy cattle

Traita

Visentin et al. [62]

Cecchinato et al. [63]

Costa et al. [64]

Sanchez et al. [65]

h2 (SE)

h2 rangeb (SE)

h2 (SE)

h2 (SE)

Coagulation traits

 RCT, min

0.28 (0.01)

0.30–0.34 (0.08)

0.35 (0.05)

–

 k20, min

0.43 (0.02)

–

0.43 (0.03)

–

 a30, mm

0.36 (0.02)

0.22–0.27 (0.07)

0.39 (0.03)

–

 a60, mm

0.27 (0.01)

–

–

–

  HCT, min

0.16 (0.01)

–

–

–

 CMS, nm

0.31 (0.02)

–

–

–

Acidity

 pH, units

0.27 (0.01)

–

–

0.37 (0.01)

Minerals, mg/kg milk

 Calcium

–

–

0.45 (0.02)

0.50 (0.01)

 Phosphorus

–

–

0.53 (0.03)

0.56 (0.01)

 Magnesium

–

–

0.47 (0.03)

0.52 (0.01)

 Potassium

–

–

0.45 (0.03)

0.53 (0.01)

 Sodium

–

–

0.38 (0.03)

0.32 (0.01)

 

Sanchez et al. [65]

Bittante et al. [66]

Cecchinato et al. [67]

h2 (SE)

h2 (SE)

ra

h2 rangec

Cheese yield, %

 CYCURD

0.38 (0.01)

0.21 (0.09)

0.97

0.18–0.33

 CYSOLIDS

0.39 (0.01)

0.22 (0.08)

0.98

0.18–0.28

 CYWATER

–

0.18 (0.05)

0.76

0.14–0.29

Nutrient recovery, %

 RECPROTEIN

–

0.44 (0.09)

0.88

0.32–0.41

 RECFAT

–

0.28 (0.07)

0.79

0.15–0.33

 RECENERGY

–

0.21 (0.07)

0.96

0.19–0.30

 RECSOLIDS

–

0.24 (0.08)

0.98

0.17–0.29

  1. aRCT Rennet coagulation time; k20 = curd-firming time; a30 = curd firmness after 30 min; a60 = curd firmness after 60 min; HCT = heat coagulation time; CMS = casein micelle size; CY: weight of fresh curd, curd solids, and curd as a percentage of weight of milk processed; REC: protein, fat, energy and solids of the curd as a percentage of the protein, fat, energy and solids of the milk processed.
  2. bRange of estimates from 4 subsets of data used to validate calibration equations.
  3. cRange of estimates from 3 different breeds.