不同饲喂水平对20~35 kg多胎萨福克羊母羊消化代谢及血清指标的影响

【目的】 研究不同饲喂水平对20~35 kg多胎萨福克羊母羊消化代谢及血清指标的影响,为肉羊科学养殖提供数据参考。【方法】 选取断奶后3月龄健康纯种多胎萨福克羊母羊15只(18.68±1.42)kg,随机分配成3个组,分别为AL组、IR70组、IR40组,每组5只羊,当试验羊AL组体重分别达到28和35 kg时,进行两期消化代谢试验。日粮参照《NY/T816-2004肉羊饲养标准》日增质量300 g/d的营养需要配制,采用饲养与消化代谢试验结合的方法,研究不同饲喂水平对20~35 kg多胎萨福克羊母羊消化代谢及血清指标的影响。【结果】 (1)饲喂水平对多胎萨福克羊母羊DM、NDF、ADF采食量有显著影响(P<0.05),DM、NDF、ADF采食量规律一致,均为AL组>IR70组>IR40组的规律,且3组之间差异显著(P<0.05);试验羊1期的DM、NDF、ADF表观消化率在3组之间差异显著(P<0.05);饲喂水平对试验羊2期DM、NDF、ADF表观消化率无显著影响(P>0.05);(2)随着饲喂水平的升高,试验羊氮采食量、粪氮、尿氮、消化氮显著升高(P<0.05);氮表观消化率IR40组与其它两组差异显著(P<0.05);不同饲喂水平组对试验羊1期沉积氮/食入氮、沉积氮/消化氮有显著影响(P<0.05),试验羊2期不同饲喂水平组之间无显著差异(P>0.05);(3)ALT、AST、GLU、TC及TG在不同饲喂水平组之间差异不显著(P>0.05),除了ALT均为IR70组最低外,其他指标均为IR40组最低;GLU血糖随饲喂水平的升高而升高。【结论】 (1)随着饲喂水平的增加,20~35 kg多胎萨福克羊母羊的DM、NDF、ADF采食量显著增加;在自由采食的状态下,多胎萨福克羊母羊体重达35 kg时,DM采食量可达到1 947.35 g/d。(2)随着饲喂水平的升高,显著提高了20~35 kg多胎萨福克羊母羊氮采食量,限饲对氮的表观消化率有显著影响,但对生长后期35 kg多胎萨福克羊母羊沉积氮/食入氮、沉积氮/消化氮无显著影响。(3)不同的饲喂水平对20~35 kg多胎萨福克羊母羊血清指标有不同程度的影响。限饲会降低血糖浓度。

Effects of Different Feeding Levels on Digestion,Metabolism and Serum Indices of 20~35kg Multifarious Suffolk Ewes

【Objective】 To study the effects of different feeding levels on the digestive metabolism and serum indexes of 20~35 kg multiparous Suffolk ewes, and provide data reference for the scientific breeding of meat sheep.【Methods】 Fifteen three-month old healthy pure-bred multifarious Suffolk ewes (18.68±1.42) kg] were randomly allocated into three groups, namely, AL group, IR70 group and IR40 group, with 5 sheep in each group. When the body weight of experimental sheep in AL group reached 28 kg and 35 kg, two phases of digestion and metabolism tests were conducted. The diet was formulated according to the nutritional requirements of 300g/d daily gain in the "NY/ T816-2004 Mutton Sheep Feeding Standard". The effects of different feeding levels on digestion, metabolism and serum indexes of 20-35 kg multifarious Suffolk ewes were studied by combining feeding with digestion and metabolism test.【Results】 (1) Feeding level had significant effects on feed intake of DM, NDF and ADF of multifarious Suffolk ewes (P<0.05). The feed intake rules of DM, NDF and ADF were the same as those of >IR70 group and BBB>40 group in AL group, and there were significant differences among the three groups (P<0.05). There were significant differences in apparent digestibility of DM, NDF and ADF among the three groups (P<0.05). The apparent digestibility of DM, NDF and ADF was not significantly affected by feeding level (P>0.05). (2) With the increase of feeding level, the nitrogen intake, fecal nitrogen, urinary nitrogen and digestive nitrogen of experimental sheep were significantly increased (P<0.05); The apparent digestibility of nitrogen in IR40 group was significantly different from that in the other two groups (P<0.05). Different feeding level groups had significant effects on the deposition nitrogen/nitrogen intake and deposition nitrogen/digested nitrogen of experimental sheep in the first stage (P <0.05), but there was no significant difference between different feeding level groups in the second stage (P>0.05). (3) ALT, AST, GLU, TC and TG had no significant differences among different feeding level groups (P>0.05), and all other indexes were the lowest in IR40 group except ALT. GLU blood glucose increased with feeding level.【Conclusion】 (1) With the increase of feeding level, the feed intake of DM, NDF and ADF of 20-35 kg multifarious Suffolk ewes significantly increased; When the body weight of multifetal Suffolk ewes reaches 35 kg, the DM feed intake can reach 1,947.35 g/d under free feeding condition. (2) With the increase of feeding level, nitrogen intake of 20-35 kg multifarious Suffolk ewes is significantly increased, and feeding restriction has significant effects on nitrogen apparent digestibility, but no significant effects on nitrogen deposition/nitrogen intake, nitrogen deposition/nitrogen digestibility of 35 kg multifarious Suffolk ewes at later growth stage. (3) Different feeding levels have different effects on serum indexes of 20-35 kg multifarious Suffolk ewes. Feeding restriction lowers blood sugar levels.