D. Cozma

CONTRIBUTIONS REGARDING STUDIES ON MILK PRODUCTION AND REPRODUCTIVE CHARACTERISTICS OF THE BNR POPULATION IN DOAGA-VRANCEA FARM

D. Cozma, V. Ujică, I. Nistor, C. Dascălu, C.E. Nistor

Abstract
The Romanian Black spotted held in one of the best elite farms in the country, placed in Vrancea County, was studied over 15 years (approximate three generations).
The cows of active population and those out of herd were studied as concern: the descendency depending on the provenance of sires (indigenous or imported); the characteristics of milk production, for normal and total lactation and subsequent lactation; the reproduction characteristics: VPF, CI, RM, SP; the productive longevity.
The results indicate that cows descending from imported sires have a mean production of 7496.44 kg milk per normal lactation and those descending from indigenous sires produced a mean of 7367.79 kg milk, that means a genetic gain of 128 kg milk (1.74%).
The active population of the investigated holding attained 7,426 kg milk compared to the out of herd population with a mean 7,291 kg milk per normal lactation. A genetic amelioration of 135 kg milk (1.85% genetic gain) from a generation to another was observed.
The age at first calving was 835.97 days; the calving interval was 439.48 days and the dry period 80.6 days.
The mean holding period was 2.77 lactations and the milk quantity per productive life was 23328.9 kg.

Key words: BNR breed, productive and reproductive performances, longevity


CONTRIBUŢII PRIVIND STUDIUL INDICILOR PRODUCŢIEI DE LAPTE ŞI REPRODUCŢIE LA POPULAŢIA BNR DIN FERMA DOAGA-VRANCEA

D. Cozma, V. Ujică, I. Nistor, C. Dascălu, C.E. Nistor

Rezumat
Studiul se refera la rasa Baltata cu negru romāneasca exploatata īntr-una dintre cele mai bune ferme de elita din tara situata īn judetul Vrancea, pe o perioada de 15 ani (aproximativ trei generatii).
Au fost luate īn studiu vacile din populatia activa cāt si cele iesite din efectiv, la care s-au analizat: originea īn functie de provenienta taurilor: indigeni si de import; indicii productiei de lapte, pe lactatie normala si totala si pe lactatii succesive; indicii de reproductie: VPF, CI, RM, SP; longevitatea productiva.
Din analiza efecuata a rezultat ca vacile provenite din tauri de import au realizat o productie medie de 7496,44 kg lapte pe lactatie normala, iar cele din taurii indigeni 7367,79 kg lapte, deci un cāstig genetic de 128 kg lapte (1,74%).
Populatia activa din fema analizata a realizat 7426 kg lapte comparativ cu populatia iesita din efectiv la care productia medie pe lactatie normala a fost de 7291 kg lapte. Se constata o ameliorare genetica de la o generatie la alta cu 135 kg lapte sau un cāstig genetic de 1,85%.
Vārsta la prima fatare a fost de 835,97 zile, intervalul īntre fatari de 439,48 zile, iar repausul mamar de 80,6 zile.
Durata de exploatare a fost īn medie 2,77 lactatii si o cantitate de lapte pe viata productiva de 23328,9 kg.

Cuvinte cheie: rasa BNR, performante de productie si reproductie, longevitate