CONTRIBUTIONS REGARDING THE STUDY OF PRECOCITY AND PRODUCTIVE LONGEVITY OF A BNR POPULATION FROM AN ELITE FARM IN MOLDOVA
Ioana Raluca Pântia, V. Ujică, I. Nistor, C.E. Nistor, D. Cozma, Ancuţa Elena Coşuleanu
The study regarding precocity and longevity was conducted at Dancu cattle farm of Research and Development Station Iaşi, on BNR primiparous and adult animals which was exploited during 1990-2008. The obtained results enlightened the following. The age at first calving, as main precocity indicator, was of 827.74 days (27 moths and 18 days), with limits between 782.92 and 896 days, which show a good precocity. Milk production on normal lactation increased from 4485.52 kg realised by the primiparous of 1995 generation up to 6300.58 kg for 2006 generation. Dates enlightened a genetic gain of 1815.06 kg of milk on a 12 years period or a yearly genetic gain of 151.25 kg of milk. Average fat content increased from 3.85% at generation 1995, up to 4.30% for generation 2003. Milk quality was improved also under the aspect of protein content from 3.08% for primiparous of generation 2001 to 3.35% for generation 2008, with an average of 3.24%. Average milk production on productive life was of 23031.09 kg of milk, with limits between 2640 kg and 66162 kg of milk. The duration of productive life was, in average, 1188.81 days (3.89 normal lactations), with limits between 218 days and 3272 days (10.72 lactations). Index of usage in production was 69.62%. Mean values of milk production and reproduction indexes for primiparous show a good genetic value for the analysed herd.
Key words: productive longevity, Romanian Black Pied (BNR), primiparous