Effect of nutritive level and lysine:calorie ratio of the ration on weight gain, feed conversion and carcass characteristics of heavy pigs.

Catalano, A.L.; Mariani, P.

Rivista di Zootecnia 45(5): 261-273


Accession: 000073396

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Castrated male Landrace x Large White pigs fed twice daily were fattened from about 80 to 155 kg. Three groups of eight had 2.6, 3.0 and 3.4 kg daily of the same dry feed mixture; all had 1.66 g lysine/1000 kcal digestible energy up to 120 kg bodyweight and 1.46 g thereafter. The mixture supplied at the rate of 3.0 kg daily was regarded as the basal feed. Two other groups had 2.6 or 3.4 kg daily, with initially 1.92 and 1.43 g lysine/1000 kcal and thereafter 1.69 and 1.27 g, so that the two mixtures contained the same amount of lysine as the basal feed. They all had ground maize, barley and soya bean meal, bran, dried lucerne, minerals, vitamins and trace elements. Greatest daily gain was with 3.4 kg feed daily, with either lysine:energy ratio, but difference among groups was not significant. The higher ratio with 2.6 kg gave a slightly greater gain than the lower or the basal feed. Feed required for gain was least with 2.6 kg feed daily and the higher lysine:energy ratio. Differences among the carcass characteristics were slight, but nearly always favoured pigs given 2.6 kg feed daily with the higher lysine:energy ratio, which produced the highest percentage of lean cuts and the lowest of fat parts and thinnest back fat. The fat content of the longissimus dorsi was significantly lowest with 2.6 or 3.4 kg feed daily and the higher of the 2 possible ratios.