Influence of Different Energy Levels of Compound Feeds on the Growth Rate and the Beginning of the Puberty in Gilts

1 Agricultural Institute, BG-9700 Shumen, Bulgaria
2 Thrakia University, Agricultural Faculty, BG-6000 Stara Zagora, Bulgaria


PETROV, P., L. GERMANOVA, D. KANEV and V. DOICHEV, 2002. Influence of different energy levels of compound feeds on the growth rate and the beginning of the puberty in gilts. Bulg. J. Agric. Sci., 9: 119–122

A production trial with 44 gilts from the Danube White breed was carried out at the Agricultural Institute – Shumen. The animals were allocated into two equal groups. The experiment started when the gilts reached 31.5 kg live weight and finished at the second oestrus. The animals from the control and the experimental groups were fed compound feed with the same content of protein and lysine and different content of energy.
It was established that the increase in the metabolizable energy in the compound feeds from 11.56 to 13.01 and from 11.82 to 13.34 MJ/kg during the two growing subperiods did not significantly influence the age and the live weight at first and second oestrus in the animals from the two groups.

Key words: average daily gain, metabolizable energy, puberty, gilts