(Wydawnictwo Uczelniane Zachodniopomorskiego Uniwersytetu Technologicznego w Szczecinie, 2015) Cioch, Barbara; Czerniawska-Piątkowska, Ewa; Rzewucka-Wójcik, Edyta; Department of Ruminant Science, West Pomeranian University of Technology, Szczecin, Poland; Department of Ruminant Science, West Pomeranian University of Technology, Szczecin, Poland; Department of Ruminant Science, West Pomeranian University of Technology, Szczecin, Poland
The studies included 88 Simental cows which were kept on farm in the West
Pomerania province. The effect of age at first calving depending on milk performance in
subsequent 305-day lactations were determined. The highest milk, fat and protein yield in third
lactation was characteristic for the cows calving between 26 and 29 month of age, whereas in
the first and second lactations – for cows calving below 26 month of age. The highest fat and
protein content was observed in milk of cows which calved late – after the age 29 months.
No clear dependence was found between the age of first calving and milk performance traits
in lactations.