Title
THE AGE AT FIRST CALVING CHARACTERISTICS AND HIMSELF IMPACT ON MILK YIELD PRIMIPAROUS MAINTAINED IN EASTERN MAZOWSZE HERDS IN 1977-2000
Autor
Piotr Guliński, Bogumiła Giersz, Grażyna Niedziałek, Krzysztof Młynek
Keywords
cows, age at I calving, genotype, production level, calving year
Abstract
The age at first calving of 5 634 cows maintained in individual herds of eastern Mazowsze in 1977-2000 were analyzed. The influence of genotype, calving year and production level on age at first calving and production level on age at first calving was investigated. The effect of age at first calving on primiparous FCM milk yield were analyzed too. The average age at first calving was 812 days. The high influence of holstein-friesian blood participation in cows genotype on decrease of age at I parturition were stated. The average age at first calving cows with high level of h.f. blood (> 50%) in genotype were 54 days shorter to the camper to the cows with lower h.f. blood participation. The influence of age at first calving on FCM milk yield (kg) were affected by cows production level. Among the cows producing in first lactation > 4 500 kg FCM milk the effect of age at I parturition wasn’t found.
Pages
31-40
Cite
Guliński, P., Giersz, B., Niedziałek, G., Młynek, K. (2003). THE AGE AT FIRST CALVING CHARACTERISTICS AND HIMSELF IMPACT ON MILK YIELD PRIMIPAROUS MAINTAINED IN EASTERN MAZOWSZE HERDS IN 1977-2000. Acta Sci. Pol. Zootechnica, 2(2), 31-40.
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