低蛋白和杂粕日粮对生长猪生产性能、养分消化、血液指标和猪舍氨气的影响

Effects of low-protein miscellaneous meal diet on the production performance,nutrient digestibility, blood indexes and piggery ammonia of pigs

用50 kg左右的DLY生长猪196头,分4个处理(标准豆粕日粮、标准8%杂粕日粮及其相应低蛋白日粮),各处理日粮按NRC1998标准配制,可消化赖氨酸、苏氨酸、蛋+胱氨酸、色氨酸和异亮氨酸达到理想蛋白氨基酸比例和水平,研究低蛋白和杂粕日粮对猪生产性能、养分消化、血液指标和猪舍氨气的影响。结果表明,150~80 kg阶段标准豆粕和8%杂粕日粮粗蛋白质降低3个百分点,对猪的生产性能没有显著影响(P>0.05);2蛋白质降低3个百分点显著降低日粮蛋白质表观消化率(P<0.05);豆粕日粮赖氨酸、苏氨酸、蛋氨酸、缬氨酸等必需氨基酸表观消化率没有降低,杂粕日粮所有氨基酸表观消化率都显著降低(P<0.05);对纤维、脂肪、灰分、钙和磷表观消化率也有不同程度影响;3低蛋白质日粮显著降低猪血浆尿素氮水平(P<0.05);4低蛋白日粮能显著降低猪舍有害气体氨气浓度(P<0.05)。

The test was to research what low-protein and miscellaneous meal diet effect on pigs produc-tion, nutrient digestibility, blood index and piggery ammonia. 120 DLY growing pigs with 50 kg aver-age body weight were divided into four groups fed with standard soybean meal ration, 8% standard mis-cellaneous ration and correspondent low-protein diet ration. Every ration was allocated according tothe standard of NRC(1998). Lysine, threonine, meth + cysteine, tryptophan and isoleucine denial lev-els were all reached the desirable protein amino acid level. The results show that: 1 There are no sig-nificant differences on piglets production(P<0.05) when 3% reduction of crude protein level in 50 kgto 80 kg state standard soybean meal and 8% miscellaneous ration; 2 3% reduction of protein signifi-cantly decrease protein apparent digestibility(P<0.05). No decrease in apparent digestibility of soy-bean meal ration's essential amino acids among methionine, lysine, threonine, valine etc. Have differ-ent effects on apperant digestibility of fiber, fat, ash, calcium and phosphorus; 3 Low-protein rationsignificantly reduced piglets' serum urea nitrogen level(P<0.05); 4 Low-protein ration significantlydecreased the concentration of poisoned ammo-nia in piggery(P<0.05).