Background: An experiment was conducted to evaluate the effects of feed restriction(FR) and sex on the quantitative and qualitative carcass traits of Morada Nova lambs. Thirty-five animals with an initial body weight ...Background: An experiment was conducted to evaluate the effects of feed restriction(FR) and sex on the quantitative and qualitative carcass traits of Morada Nova lambs. Thirty-five animals with an initial body weight of 14.5 ± 0.89 kg and age of 120 d were used in a completely randomized study with a 3 × 3 factorial scheme consisting of three sexes(11 entire males, 12 castrated males and 12 females) and three levels of feeding(ad libitum – AL and 30% and 60% FR).Results: Entire males presented greater hot and cold carcass weights(P < 0.05), followed by castrated males and females. However, the hot carcass yield was higher for females and castrated males than for entire males. Luminosity values were influenced(P < 0.05) by sex, with entire males presenting higher values than castrated males and females.Females showed higher(P < 0.05) concentrations of linoleic acid and arachidonic acid in the meat of the longissimus thoracis muscle. The meat of animals submitted to AL intake and 30% FR showed similar(P > 0.05) concentrations, and the concentrations of palmitic acid, palmitoleic acid, stearic acid, oleic acid and conjugated linoleic acid were higher(P < 0.05) than those of animals with 60% FR. The meat of females had a higher ω6/ω3 ratio and lower h/H ratio, and females had greater levels of feeding. The meat of animals on the 60% FR diet had a greater ω6/ω3 ratio, lower h/H ratio and lower concentration of desirable fatty acids in addition to a greater atherogenicity index(AI) and thrombogenicity index(TI).Conclusion: Lambs of different sexes had carcasses with different quantitative traits without total influence on the chemical and physical meat characteristics. The lipid profile of the meat was less favorable to consumer health when the animals were female or submitted to 60% feed restriction.展开更多
旨在使用加权一步法全基因组关联分析方法,充分利用群体的表型、系谱和基因型信息,探索与大白猪眼肌面积、估计瘦肉率和背膘厚相关的候选基因。本研究收集21754头大白猪眼肌面积、估计瘦肉率和背膘厚的表型记录数据,其中基因型数据个体...旨在使用加权一步法全基因组关联分析方法,充分利用群体的表型、系谱和基因型信息,探索与大白猪眼肌面积、估计瘦肉率和背膘厚相关的候选基因。本研究收集21754头大白猪眼肌面积、估计瘦肉率和背膘厚的表型记录数据,其中基因型数据个体共1259头。通过方差分析和加权一步法全基因组关联分析,确定性状显著相关的数量性状基因座(quantitative trait locus,QTL)。并进行基因注释、GO(gene ontology)功能和KEGG(kyoto encyclopedia of genes and genomes)通路富集分析。计算结果表明,大白猪眼肌面积、估计瘦肉率和背膘厚的遗传力分别为0.4506±0.0173、0.4968±0.0174和0.4758±0.0172。利用加权一步法全基因组关联分析,定位到与眼肌面积显著相关的候选QTL区域10个,与估计瘦肉率显著相关的候选QTL区域8个,与背膘厚显著相关的候选QTL区域12个。后续基因注释、GO功能和KEGG通路富集分析显示,与眼肌面积相关的候选基因36个,共富集到7个条目;与估计瘦肉率相关的候选基因29个,共富集到2个条目;与背膘厚相关的候选基因41个,共富集到11个条目。分析这些条目中所包含的基因,结果显示其中部分候选基因与生长发育、肌肉脂肪和骨骼发育有关。如ADAL基因影响脂肪细胞分化等活动;FGF 9基因被报道参与骨骼发育等过程。本研究通过加权一步法关联分析定位到与大白猪生长性状相关的重要候选基因,结果扩展了大白猪生长性状的相关研究,并为今后该品种生长性状的基因组遗传改良提供重要分子标记。展开更多
建立了超高效液相色谱-串联质谱快速简单地同时测定猪尿液中30种不同种类"瘦肉精"药物(赛庚啶、可乐定及28种β-受体激动剂类)残留的方法。对液相色谱分离条件、MS/MS检测参数及样品前处理方式进行了优化。试样经5000 r/min离...建立了超高效液相色谱-串联质谱快速简单地同时测定猪尿液中30种不同种类"瘦肉精"药物(赛庚啶、可乐定及28种β-受体激动剂类)残留的方法。对液相色谱分离条件、MS/MS检测参数及样品前处理方式进行了优化。试样经5000 r/min离心5 min后直接经MCX柱净化,分别用3 m L水和3 m L甲醇淋洗,5%氨化甲醇进行洗脱,N2吹干后以流动相进行复溶,UPLC-MS/MS进行测定。结果表明,30种药物可在5.0 min内有效分离;各药物在0.1~10μg/L范围内呈良好的线性关系,相关系数均大于0.992;方法的检出限为0.1μg/L,定量限为0.3μg/L。在3个浓度水平下的平均回收率为67.6%~103.2%,日内、日间相对标准偏差分别为2.8%~16.8%和2.6%~15.8%。展开更多
基金supported by the National Council for Scientific and Technological Development(CNPq-Brazil)
文摘Background: An experiment was conducted to evaluate the effects of feed restriction(FR) and sex on the quantitative and qualitative carcass traits of Morada Nova lambs. Thirty-five animals with an initial body weight of 14.5 ± 0.89 kg and age of 120 d were used in a completely randomized study with a 3 × 3 factorial scheme consisting of three sexes(11 entire males, 12 castrated males and 12 females) and three levels of feeding(ad libitum – AL and 30% and 60% FR).Results: Entire males presented greater hot and cold carcass weights(P < 0.05), followed by castrated males and females. However, the hot carcass yield was higher for females and castrated males than for entire males. Luminosity values were influenced(P < 0.05) by sex, with entire males presenting higher values than castrated males and females.Females showed higher(P < 0.05) concentrations of linoleic acid and arachidonic acid in the meat of the longissimus thoracis muscle. The meat of animals submitted to AL intake and 30% FR showed similar(P > 0.05) concentrations, and the concentrations of palmitic acid, palmitoleic acid, stearic acid, oleic acid and conjugated linoleic acid were higher(P < 0.05) than those of animals with 60% FR. The meat of females had a higher ω6/ω3 ratio and lower h/H ratio, and females had greater levels of feeding. The meat of animals on the 60% FR diet had a greater ω6/ω3 ratio, lower h/H ratio and lower concentration of desirable fatty acids in addition to a greater atherogenicity index(AI) and thrombogenicity index(TI).Conclusion: Lambs of different sexes had carcasses with different quantitative traits without total influence on the chemical and physical meat characteristics. The lipid profile of the meat was less favorable to consumer health when the animals were female or submitted to 60% feed restriction.
文摘旨在使用加权一步法全基因组关联分析方法,充分利用群体的表型、系谱和基因型信息,探索与大白猪眼肌面积、估计瘦肉率和背膘厚相关的候选基因。本研究收集21754头大白猪眼肌面积、估计瘦肉率和背膘厚的表型记录数据,其中基因型数据个体共1259头。通过方差分析和加权一步法全基因组关联分析,确定性状显著相关的数量性状基因座(quantitative trait locus,QTL)。并进行基因注释、GO(gene ontology)功能和KEGG(kyoto encyclopedia of genes and genomes)通路富集分析。计算结果表明,大白猪眼肌面积、估计瘦肉率和背膘厚的遗传力分别为0.4506±0.0173、0.4968±0.0174和0.4758±0.0172。利用加权一步法全基因组关联分析,定位到与眼肌面积显著相关的候选QTL区域10个,与估计瘦肉率显著相关的候选QTL区域8个,与背膘厚显著相关的候选QTL区域12个。后续基因注释、GO功能和KEGG通路富集分析显示,与眼肌面积相关的候选基因36个,共富集到7个条目;与估计瘦肉率相关的候选基因29个,共富集到2个条目;与背膘厚相关的候选基因41个,共富集到11个条目。分析这些条目中所包含的基因,结果显示其中部分候选基因与生长发育、肌肉脂肪和骨骼发育有关。如ADAL基因影响脂肪细胞分化等活动;FGF 9基因被报道参与骨骼发育等过程。本研究通过加权一步法关联分析定位到与大白猪生长性状相关的重要候选基因,结果扩展了大白猪生长性状的相关研究,并为今后该品种生长性状的基因组遗传改良提供重要分子标记。
文摘建立了超高效液相色谱-串联质谱快速简单地同时测定猪尿液中30种不同种类"瘦肉精"药物(赛庚啶、可乐定及28种β-受体激动剂类)残留的方法。对液相色谱分离条件、MS/MS检测参数及样品前处理方式进行了优化。试样经5000 r/min离心5 min后直接经MCX柱净化,分别用3 m L水和3 m L甲醇淋洗,5%氨化甲醇进行洗脱,N2吹干后以流动相进行复溶,UPLC-MS/MS进行测定。结果表明,30种药物可在5.0 min内有效分离;各药物在0.1~10μg/L范围内呈良好的线性关系,相关系数均大于0.992;方法的检出限为0.1μg/L,定量限为0.3μg/L。在3个浓度水平下的平均回收率为67.6%~103.2%,日内、日间相对标准偏差分别为2.8%~16.8%和2.6%~15.8%。
