Feed conversion during the rearing of heifers of the Bohemian Pied and Black Pied Lowland breeds and their crossbreeds

Dedeckova Salova, J.

Zivocisna Vyroba 33(2): 171-181

1988


ISSN/ISBN: 0044-4847
Accession: 001594760

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Abstract
Trials with heifers of the Bohemian Pied (C) and Black Pied Lowland (N) breeds and their crossbreds from the CNC and CNN combinations were made to evaluate the nutritive value of the type and standard of nutrition required to reach the growth rate when the heifers could be used for breeding at the age of 15 months and live weight 360 kg. Owing to the different feed intake from 1 to 6 months old, the largest differences in nutrient intake between breeds were recorded in this period. The CNC and CNN heifers ate almost 2% less digestible crude protein (DCP) and starch units (SU) than the C and N heifers and the CNC heifers failed to reach the expected daily weight gain of 700 g. Later, heifers >6 months old, ate all the rations (35% of DM taken in as concentrates) so that there were no differences in the intake of feeds and nutrients in the later period of rearing. From 1 to 15 months old the difference in nutrient intake by the heifers of individual groups remained below 1%. The best conversion of the nutrients for the period 1 to 15 months was recorded in CNN heifers, which had the highest daily weight gain, 789 g. They ingested 577 g DCP and 2.78 SU per kg weight gain. CNC heifers had the worst conversion and required 12% more DCP and SU for 1 kg weight gain. Compared with the heifers of the N breed, the second best in the conversion of feed ration nutrients, CNC heifers consumed 10% more DCP and SU. The conversion of feed nutrients corresponds with the achieved growth rate of the heifers.