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• W1514921963 abstract "Description of genetic evaluation for longevity in Italian Brown population is presented. A total of 49,520 records of first parity cows, born from 1983 to 1986, were used to analyse longevity, type and production traits and to estimate genetic parameters. Functional longevity was defined as total production days (lifetime) adjusted for within herd-year-season class deviation from average herd milk yield (linear and quadratic effects). Genetic parameters were estimated using a REML multiple trait sire model procedures that considered the fixed effects of herd, stage of lactation, age at the first type scoring, interaction between calving year and type classifier, and time interval between milking and type scoring. Heritability values were 0.24, 0.06 and 0.04 for milk yield, true and functional longevity, respectively. Genetic correlations between milk yield and functional longevity was negligible. Longevity exhibited positive genetic associations with udder depth (0.43), rear teats view (0.21) and fore udder attachment (0.15). Negative genetic correlations between functional longevity and type traits were -0.42, -0.29 and -0.13 for teats length, set of rear legs and stature, respectively. An index to predict functional longevity was developed using stature, set rear legs, udder fore attachment, udder depth and teats length estimated breeding values (index weights: -0.31, -0.02, 0.17, 0.33 and –0.17, respectively). The genetic expected response to the selection aimed to improve functional longevity was computed. A ratio of 1 to 6 for functional longevity and production traits was used. Using the new selection index, the genetic progress per year was predicted to be 70 kg, 3.2 kg, 2.6 kg and 0.11 months, for milk yield, fat yield, protein yield and functional longevity, respectively. Since January 1998, the new selection index is used for the Italian Brown population." @default.
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• W1514921963 date "1999-01-01" @default.
• W1514921963 modified "2023-09-27" @default.
• W1514921963 title "Genetic evaluation of longevity in Italian Brown cattle breed" @default.
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