Effectiveness of feed mixtures with the different content of N-substances in the one-phase fattening of pigs
2002
Galik, R. | Garlik, J. | Milly, P. (Slovenska Polnohospodarska Univ., Nitra (Slovak Republic))
Thirty four-bred hybrid pigs L (BuxL) x o-(Du x Pn) were used in a 115-day experiment to study the effect of feeding animals single feed mixture during whole fattening period. Pigs with a 30 to 100 kg live weight were divided into 3 groups of 10 heads each. Experimental groups (EG) I, II, and III were offerred food with a different content of N-substances (16.03,17.26 and 19.17% in dry matter (DM)) and of essential amino acids, and with an amount of lysine per MJ. Meo. Energy value of mixtures was calculated by means of average coefficients of digestibility as determined by the indicator method. Different levels of N-substances were obtained by a different proportion of soyabean extracted groats in feed mixtures. The highest average daily gain (664 g) during all the experimental period was observed in the group which was offered diet with a middle content of N-substances (172.6 g N-substances or 7.24 g lysine per kg food DM). Food consumption per kg gain was 3.43 kg. According to the parameters of carcass quality and nutrient content in muscles DM, there was no significant difference between groups (P more than 0.05). The animals in EG III showed a higher DM content in liver (vs. EG I and II; P less than 0.05), the highest content of fat in DM (vs. EG I; P less than 0.01) and the lowest content of residual N-substances (vs. EG I; P less than 0.05). Differences in the relative proportion of fatty acid content in the fat of products were not statistically significant
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