【目的】旨在研究山下黑猪与其杂交组合猪(杜洛克♂×山下黑猪♀:杜山下)的性状差异,为山下黑猪的生产性能评估及其配套生产时选择终端父本提供参考。【方法】通过测定山下黑猪(SX)与杜山下(DSX)杂交猪只的胴体、肉质、繁殖和生长性...【目的】旨在研究山下黑猪与其杂交组合猪(杜洛克♂×山下黑猪♀:杜山下)的性状差异,为山下黑猪的生产性能评估及其配套生产时选择终端父本提供参考。【方法】通过测定山下黑猪(SX)与杜山下(DSX)杂交猪只的胴体、肉质、繁殖和生长性状,并使用线性模型对以上共计41个具体性状进行统计分析,比较2个群体的生产性能差异。【结果】山下黑猪与杜山下的繁殖性状、生长肥育性状(初生重和宰前活重)差异不显著;杜山下的胸宽、管围和臀宽性状显著大于山下黑猪,体长和体高性状显著小于山下黑猪,杜山下的屠宰率、胴体斜长、胸椎长和眼肌面积均极显著高于山下黑猪,6/7肋皮厚、肩部膘厚、腰部膘厚、荐部膘厚、四点均膘极显著低于山下黑猪,山下黑猪的胸椎数、腰椎数和腰椎长均极显著高于杜山下;肉质性状除大理石纹评分、pH值、45 min肉色评分和24 h a*值没有显著差异外,山下黑猪的肉质性状显著高于杜山下。【结论】山下黑猪凭借优质肉和较大体型可面向中高端市场,而杜山下更高的载肉量可面向中端市场。展开更多
旨在估计山下黑猪和鲁莱黑猪正反交F1代杂种优势,筛选出合适的杂交方式,以提高优质肉猪的生产效率,满足人们对于优质猪肉的需求。本研究在山下黑猪(164头)和鲁莱黑猪(69头)及其正(6头山下黑猪♂×25头鲁莱黑猪♀)、反(3头鲁莱黑猪♂...旨在估计山下黑猪和鲁莱黑猪正反交F1代杂种优势,筛选出合适的杂交方式,以提高优质肉猪的生产效率,满足人们对于优质猪肉的需求。本研究在山下黑猪(164头)和鲁莱黑猪(69头)及其正(6头山下黑猪♂×25头鲁莱黑猪♀)、反(3头鲁莱黑猪♂×35头山下黑猪♀)交4个群体中测定了生长肥育、体尺外貌(75~110 kg)、繁殖和胴体肉质(90~115 kg)4大类共43个性状,比较了这些性状在群体间的差异,并估计了正反交F1代的杂种优势。结果表明,山下黑猪的生长肥育和体尺性状较好,鲁莱黑猪的繁殖和肉质性状较好,正反交群体介于它们之间。正交群体的繁殖性能优于反交群体,但生长肥育性能比反交差。由于这4个群体的母猪都是纯种,因此繁殖性状没有表现出明显杂种优势。除膘厚、胸椎数、45 min pH和剪切力无显著的杂种优劣势外,大部分胴体性状和肉质性状有明显的杂种劣势。生长肥育性状的杂种优势在正反交群体中的表现不一致,反交群体表现出显著杂种优势,而正交则无明显的杂种优势。本研究估计了山下黑猪和鲁莱黑猪正反交的杂种优势,为筛选山下黑猪和鲁莱黑猪的最佳杂交方式奠定基础。展开更多
A series of Fe-Y zeolite catalysts with different Fe loading were prepared by ferrocene sublimation under solvent and water-free conditions.The dispersion,structure and morphology of the iron species on the Fe-Y catal...A series of Fe-Y zeolite catalysts with different Fe loading were prepared by ferrocene sublimation under solvent and water-free conditions.The dispersion,structure and morphology of the iron species on the Fe-Y catalysts were characterized by XRD,TEM and UV-Vis.The catalytic activities of Fe-Y samples were measured in selective catalytic reduction of NO with ammonia(NH3-SCR).The results showed that the iron species on the HY zeolite support were mainly made up of isolated Fe3+ions,Fex Oy oligomers and a little amount of<3 nm spherical Fe2O3particles.Isolated Fe3+ions are predominating among all the Fe-Y catalysts.The sum of isolated Fe3+ions and Fex Oy oligomers took up more than 90%percent of total iron species on the Fe-Y till 10.0 wt%loading of Fe.展开更多
文摘【目的】旨在研究山下黑猪与其杂交组合猪(杜洛克♂×山下黑猪♀:杜山下)的性状差异,为山下黑猪的生产性能评估及其配套生产时选择终端父本提供参考。【方法】通过测定山下黑猪(SX)与杜山下(DSX)杂交猪只的胴体、肉质、繁殖和生长性状,并使用线性模型对以上共计41个具体性状进行统计分析,比较2个群体的生产性能差异。【结果】山下黑猪与杜山下的繁殖性状、生长肥育性状(初生重和宰前活重)差异不显著;杜山下的胸宽、管围和臀宽性状显著大于山下黑猪,体长和体高性状显著小于山下黑猪,杜山下的屠宰率、胴体斜长、胸椎长和眼肌面积均极显著高于山下黑猪,6/7肋皮厚、肩部膘厚、腰部膘厚、荐部膘厚、四点均膘极显著低于山下黑猪,山下黑猪的胸椎数、腰椎数和腰椎长均极显著高于杜山下;肉质性状除大理石纹评分、pH值、45 min肉色评分和24 h a*值没有显著差异外,山下黑猪的肉质性状显著高于杜山下。【结论】山下黑猪凭借优质肉和较大体型可面向中高端市场,而杜山下更高的载肉量可面向中端市场。
文摘旨在估计山下黑猪和鲁莱黑猪正反交F1代杂种优势,筛选出合适的杂交方式,以提高优质肉猪的生产效率,满足人们对于优质猪肉的需求。本研究在山下黑猪(164头)和鲁莱黑猪(69头)及其正(6头山下黑猪♂×25头鲁莱黑猪♀)、反(3头鲁莱黑猪♂×35头山下黑猪♀)交4个群体中测定了生长肥育、体尺外貌(75~110 kg)、繁殖和胴体肉质(90~115 kg)4大类共43个性状,比较了这些性状在群体间的差异,并估计了正反交F1代的杂种优势。结果表明,山下黑猪的生长肥育和体尺性状较好,鲁莱黑猪的繁殖和肉质性状较好,正反交群体介于它们之间。正交群体的繁殖性能优于反交群体,但生长肥育性能比反交差。由于这4个群体的母猪都是纯种,因此繁殖性状没有表现出明显杂种优势。除膘厚、胸椎数、45 min pH和剪切力无显著的杂种优劣势外,大部分胴体性状和肉质性状有明显的杂种劣势。生长肥育性状的杂种优势在正反交群体中的表现不一致,反交群体表现出显著杂种优势,而正交则无明显的杂种优势。本研究估计了山下黑猪和鲁莱黑猪正反交的杂种优势,为筛选山下黑猪和鲁莱黑猪的最佳杂交方式奠定基础。
基金support of the National Natural Science Foundation of China(20903080)
文摘A series of Fe-Y zeolite catalysts with different Fe loading were prepared by ferrocene sublimation under solvent and water-free conditions.The dispersion,structure and morphology of the iron species on the Fe-Y catalysts were characterized by XRD,TEM and UV-Vis.The catalytic activities of Fe-Y samples were measured in selective catalytic reduction of NO with ammonia(NH3-SCR).The results showed that the iron species on the HY zeolite support were mainly made up of isolated Fe3+ions,Fex Oy oligomers and a little amount of<3 nm spherical Fe2O3particles.Isolated Fe3+ions are predominating among all the Fe-Y catalysts.The sum of isolated Fe3+ions and Fex Oy oligomers took up more than 90%percent of total iron species on the Fe-Y till 10.0 wt%loading of Fe.
