Izvorni znanstveni članak
CATTLE BREEDING PROGRAMME IMPROVEMENT IN CROATIA 1974.-1987. 2. Milk and milk fat production of Simmental bull mothers in Croatia
Dubravko Viduč
; Centar za reprodukciju u stočarstvu Hrvatske, Republika Hrvatska
Ivo Karađole
; Veterinarski fakultet, Zavod za stočarstvo, Zagreb, Republika Hrvatska
Rudolf Šic
; Veterina medicine, Zagreb, Republika Hrvatska
Pero Božić
; Centar za reprodukciju u stočarstvu Hrvatske, Zagreb, Republika Hrvatska
Nikola Dasović
; Centar za reprodukciju u stočarstvu Hrvatske, Zagreb, Republika Hrvatska
Zvonimir Štefanac
; Centar za reprodukciju u stočarstvu Hrvatske, Zagreb, Republika Hrvatska
Sažetak
The Programme of Cattle Breeding in Croatia (1973) gives precise instructions regarding breeds as well as methods and techniques to be applied in breeding and selection work. The Programme emphasises the required number and quality of bull mothers used for creating new generations of bulls for breeding. The improvement in cattle population largely depends on their quality, i. e. genetic potential. With this in mind we investigated milk production and milk fat of 167 bull mothers, selected in the period from 1974 to 1987, whose sons were included in the herd of bulls for breeding at the Central Institute for Reproduction and Breeding of Domestic Animals. The established values of the amount of milk and fat were bolow the required in 31,6% and above in 68.4% lactations. The amount of fat (in kg) was below the required in 54.7% and above in 45.3% lactations. The fat ranged from 3.74% to 3,87% and was of no significance regarding the amount of lat expressed in kilograms. Milk production in the first lactation ranged from 2,351 kg to 6,301 kg, which means that the "regulations" for classes I and la on the required amount were not fully respected. The production was lower than required for class lain 36.72% and higher in 63.27%. The average amount of milk produced in all lactations was in 69.0% lower and in 63.27% higher than required. The amount of milk produced in the highest lactations was 5,651 kg on average, i. e. from 3,812 to 8,607 kg. Milk produced by the bull mothers investigated in single lactations and during exploitation increased on average from the beginning to the mid-period and then decreased to the end of the period observed.
Ključne riječi
Hrčak ID:
162407
URI
Datum izdavanja:
22.5.1992.
Posjeta: 657 *