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Genetic and phenotypic associations of milk traits with age at calving and with length of open period, dry period and lactation



Genetic and phenotypic associations of milk traits with age at calving and with length of open period, dry period and lactation



Egyptian Journal of Animal Production 28(2): 131-146



Data on Austrian Simmental cattle were obtained from the Federation of Austrian Cattle Breeders; the animals were connected with 3 local breed associations. For 130 039 cows calving in 1976-82, age at 1st calving averaged 29.3 months. There were only slight differences in service period, dry period and lactation length between cows in their 1st, 2nd, 3rd and 4th lactations.

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