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- W2169580045 abstract "The aim of this study was to identify useful secondary traits for estimating genetic ability of milk production traits. We investigated the value of using plasma metabolites concentrations. Two hundred and nineteen cattle out of 271 had only milk production traits records (G1), 33 had only metabolites records (G2), and 19 had both milk production traits and metabolites records (G3). Fifty two calves with metabolites records (G2 and G3) were born from 1992 to 1997. Forty three calves (29 females, 14 males) were used from 10 to 90 d of age and the others (3 females, 6 males) from 10 to 60 d of age. A total of 566 records of milk yield, fat yield and protein yield for 240 to 305 d on 238 heads (G1 and G2) were collected The collected blood samples were divided into three age groups: AG1, 10 to 30 d; AG2, 40 to 60 d; and AG3, 70 to 90 d. Heritabilities of milk yield, fat yield and protein yield were 0.45±0.04, 0.50±0.04 and 0.38±0.04, respectively. Heritability of plasma glucose concentration at AG1 was 0.45±0.08. Genetic correlations between plasma glucose concentration and milk yield, fat yield and protein yield were -0.35±0.28, 0.64±0.24 and 0.36±0.35, respectively. When the plasma glucose concentration at AG1 was used to estimate genetic ability of these milk production traits, reliability of milk yield of animals without milk record increased 8.2%, fat yield increased 24.2% and protein yield increased 9.5%. Heritability of plasma total cholesterol concentration at AG3 was 0.83±0.04. Genetic correlation between plasma total cholesterol concentration and milk yield, fat yield and protein yield were 0.58±0.21, 0.42±0.20 and 0.45±0.22, respectively. When the plasma total cholesterol concentration at AG3 was using to estimate genetic ability of these milk production traits, reliability of milk yield of animals without milk record increased 19.0%, fat yield increased 9.6%, and protein yield increased 13.5%. The annual genetic gain is in proportion to the reliability of selection. These results show that the plasma metabolite concentrations would be useful for improvement of genetic ability for milk production traits in the genetic improvement in herd of cows, where half of the animals selected are from a herd without its own milk record. (Asian-Aust. J. Anim. Sci. 2002. Vol 15, No. 12 : 1813-1821)" @default.
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- W2169580045 date "2002-01-01" @default.
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- W2169580045 title "Plasma Metabolites Concentrations in Calves until 90 Days of Age for Estimating Genetic Ability for Milk Production Traits" @default.
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- W2169580045 doi "https://doi.org/10.5713/ajas.2002.1813" @default.
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