道寒杂交母羊哺乳期能量和蛋白质需要量的研究

发布时间：2018-04-26 16:00

  本文选题：母羊 + 哺乳期　； 参考：《河北农业大学》2015年硕士论文

【摘要】：本试验采用随机区组设计将15只道寒杂交哺乳母羊按体重分为3组,自由采食组、80%限饲组和60%限饲组,每组5只羊。分别在哺乳期第15、45和75 d时进行消化代谢试验和气体代谢试验,研究哺乳母羊能量和蛋白质的代谢规律及需要量。获得了在本试验条件下道寒杂交母羊哺乳期能量和蛋白质需要量的析因模型。研究结果表明:1.随着饲喂水平的降低,道寒杂交哺乳母羊干物质采食量、粪排出量、食入氮、粪氮、食入碳、粪碳、消化碳、食入总能、粪能、尿能、消化能、代谢能、代谢体重和干物质采食量/代谢体重均呈下降趋势,且自由采食组均显著高于60%限饲组(P0.05);随饲喂水平的降低,氮表观消化率、碳表观消化率、总能消化率、耗氧量/代谢体重和CO2排出量/代谢体重有升高趋势;随哺乳时间的增加,乳氮和乳碳呈下降的趋势,且在哺乳前期时显著高于哺乳后期(P0.05)。2.道寒杂交母羊哺乳前期、中期和后期维持净能需要量分别为226.14、223.83和221.72 k J/kg W0.75·d,维持代谢能需要量分别为327.06、318.15和303.77k J/kg W0.75·d,代谢能的维持利用效率分别为0.691、0.704和0.730;道寒杂交母羊哺乳前期、中期和后期维持净蛋白需要量为2.25、2.01和1.76 g/kg W0.75·d。3.道寒杂交母羊哺乳期净能(NER)、代谢能(MER)和净蛋白质(NPR)总需要量解析模型分别为:净能总需要量的析因模型:哺乳前期:NER=226.14 k J/kg W0.75·d+NEg;log10ER=3.1206+0.4658log10BW哺乳中期:NER=223.83 k J/kg W0.75·d+NEg;log10ER=3.0815+0.4602log10BW哺乳后期:NER=221.72 k J/kg W0.75·d+NEg;log10ER=2.8349+0.5594log10BW代谢能总需要量的析因模型:MER=327.06 k J/kg W0.75·d +NEg/0.7327;log10ER=3.1206+0.4658log10BWMER=318.15 k J/kg W0.75·d +NEg/0.7591;log10ER=3.0815+0.4602log10BWMER=303.77 k J/kg W0.75·d +NEg/0.8317;log10ER=2.8349+0.5594log10BW净蛋白质总需要量的析因模型为:哺乳前期:NPR=2.25g/kg W0.75·d+Npg;log10NR=-2.7775+2.2807log10BW;NR=-9.6915+0.0925NPg哺乳中期:NPR=2.01 g/kg W0.75·d+Npg;log10NR=-2.0667+1.851log10BW;NR=-9.8755+0.094NPg哺乳后期:NPR=1.76 g/kg W0.75·d+Npg;log10NR=-1.4648+1.4933log10BW;NR=-11.775+0.0961NPg4.提出了哺乳母羊能量和蛋白质需要量参数。
[Abstract]:In this experiment, 15 crossing lactating ewe were divided into 3 groups according to their body weight by random block design. The free feeding group was divided into three groups: the free feeding group (80%) and the 60% (60%) group, with 5 sheep in each group. Digestion and metabolism tests and gas metabolism tests were carried out at 1545 and 75 days during lactation to study the metabolic rules and requirements of energy and protein in lactating ewe. A factorial model of energy and protein requirement in lactating period of Dahan crossbred ewes was obtained. The results of the study show that 1: 1. With the decrease of feeding level, dry matter intake, fecal excretion, nitrogen intake, fecal nitrogen intake, carbon intake, fecal carbon, digesting carbon, total energy intake, fecal energy, urination energy, digestibility energy, metabolic energy, fecal energy, nitrogen intake, fecal nitrogen intake, total energy intake, fecal energy, urine energy, digestibility energy, metabolic energy, The metabolic body weight and dry matter intake / metabolic weight showed a downward trend, and the free feed intake group was significantly higher than 60% restricted feed group P0.05, with the decrease of feed level, the apparent nitrogen digestibility, carbon apparent digestibility, total energy digestibility, nitrogen apparent digestibility, carbon apparent digestibility, total energy digestibility, Oxygen consumption / metabolic weight and CO2 excretion / metabolic weight increased, and with the increase of lactation time, milk nitrogen and milk carbon showed a decreasing trend, and at the early stage of lactation, it was significantly higher than that in late lactation period (P0.05 路2). The maintenance net energy requirements of Dahan crossbred ewe were 226.14223.83 and 221.72 k J/kg W0.75d, 327.06318.15 and 303.77k J/kg W0.75d, respectively, and the maintenance and utilization efficiency of metabolic energy were 0.691 0.704 and 0.730, respectively. The net protein requirements were 2.25 g/kg 2.01 and 1.76 g/kg W0.75 d.3. The analytical models of total net energy requirement (NERN) and net protein (NPR) of Daohan crossbred ewe during lactation are as follows: the factorial model of net energy requirement is 226.14 k J/kg W0.75 d before lactation: Negg log 10 ERN 3.1206 0.4658log10BW mid lactation: 223.83 k J/kg W 0.75 d NEglog 10 ERT 3.0815 0.4602log10BW later stage of lactation. :NER=221.72 k J/kg W0.75路d NEg;log10ER=2.8349 0.5594log10BW浠ｈ阿鑳芥，

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