血浆VLDL浓度双向选择对蛋鸡生产性能的影响

以雅发褐壳蛋鸡为供试材料 ,在零世代和一世代双向选择的基础上 ,应用血浆极低密度脂蛋白(VLDL)浓度对体腹脂性状继续进行双向选择 ,比较了高低脂系的生产性能 ,并研究了二世代母鸡中后期血浆VLDL浓度与上述性状的相关程度 ,进一步探讨了血浆VLDL浓度的双向选择效应。研究结果表明 ,二世代前期(19～ 4 3周 )产蛋量高脂系较高 (P <0 .0 5 ) ,在中后期 (44～ 6 2周 )低脂系产蛋量较高 (P <0 .0 5 ) ,全期 (19～ 6 2周 )产蛋量高、低脂系间差异不显著 (P >0 .0 5 ) ;二世代母鸡血浆VLDL与前期 (19～ 4 3周 )产蛋量呈显著的正表型相关 (P <0 .0 5 )和中等程度的正遗传相关 ,与中后期 (44～ 6 2周 )产蛋量呈显著的负表型相关 (P <0 .0 5 )和中等程度的负遗传相关 ,与全期产蛋量呈极低的正表型相关 (P >0 .0 5 )和正遗传相关。二世代母鸡蛋重低脂系较高 ,但两系间差异不显著 (P >0 .0 5 )。血浆VLDL浓度与蛋重呈较低的负表型相关和中等程度的负遗传相关 ,表明对血浆VLDL浓度的低向选择有可能使中后期蛋重提高。     

肉鸡血浆VLDL浓度的选择效应——对产蛋性能的影响

以零世代和一世代高、低脂系肉鸡为素材 ,个体记录高、低脂系母鸡产蛋性能 ,屠宰测定零世代 54周龄母鸡腹脂重 (率 ) ,探讨肥度性状与产蛋性能的关系 ,并研究零世代、一世代高、低脂系产蛋性能选择效应。结果表明 :在限饲条件下 ,腹脂重 (率 )与开产日龄、产蛋量表型相关很弱。腹脂重 (率 )与蛋重呈负表型相关趋势 ;零世代高、低脂系产蛋性能差异不显著。一世代低脂系比高脂系早开产 6.7d,低脂系 4 0周龄和 54周龄产蛋量显著高于高脂系 ,表明对血浆 VLDL浓度的选择使产蛋性能产生了有益的间接反应     

肉鸡血浆VLDL浓度的选择效应——对产蛋性能的影响

以零世代和一世代高,低脂系肉鸡为素材,个体记录高,低脂系母鸡产蛋性能,屠宰测定零世代５４周期母鸡腹脂重（率）,探讨肥度性状与产蛋性能的关系,并研究零世代,一世代高,低脂系产蛋性能选择效应。结果表明：在限饲条件下,腹脂重（率）＿与开产日龄、产蛋量表型相关很弱。腹脂重（率）与蛋重呈负表型相关趋势,零世代高、低脂系产蛋性能差异不显著。一世代低脂系比高脂系早开产６．７ｄ,低脂系４０周龄和５４周龄产蛋量显著     

肉种鸡血浆VLDL浓度与肥度性状的相关研究

以肉种鸡为试验素材，分别测定其16周龄、54周龄血浆VLDL浓度和54周龄腹脂重（率），探讨肉种鸡血浆VLDL浓度与肥度性状和体重的关系。结果表明：16周龄公、母鸡血浆VLDL浓度差异不显著，54周龄母鸡血浆VLDL浓度显著高于公鸡；54周龄母鸡血浆VLDL浓度显著高于16周龄母鸡，54周龄公鸡血浆VLDL浓度小于16周龄公鸡；54周龄公鸡腹部无脂肪沉积，母鸡腹脂重为120.9g，腹脂率为3.22%；16周龄血浆VLDL浓度与54周龄体重呈显著相关，而与54周龄腹脂重（率）相关不显著，54周龄血浆VLDL浓度与体重、腹脂重（率）相关不显著。     

肉种鸡血浆VLDL浓度与肥度性状的相关研究

以肉种鸡为试验素材 ,分别测定其 16周龄、5 4周龄血浆VLDL浓度和 5 4周龄腹脂重 (率 ) ,探讨肉种鸡血浆VLDL浓度与肥度性状和体重的关系。结果表明 :16周龄公、母鸡血浆VLDL浓度差异不显著 ,5 4周龄母鸡血浆VLDL浓度显著高于公鸡 ;5 4周龄母鸡血浆VLDL浓度显著高于 16周龄母鸡 ,5 4周龄公鸡血浆VLDL浓度小于 16周龄公鸡 ;5 4周龄公鸡腹部无脂肪沉积 ,母鸡腹脂重为 12 0 .9g ,腹脂率为 3 .2 2 % ;16周龄血浆VLDL浓度与 5 4周龄体重呈显著相关 ,而与 5 4周龄腹脂重 (率 )相关不显著 ,5 4周龄血浆VLDL浓度与体重、腹脂重 (率 )相关不显著     

蛋用型鸡血浆极低密度脂蛋白浓度与蛋黄脂肪酸含量的相关研究

蛋用型鸡血浆极低密度脂蛋白（ＶＬＤＬ）浓度与蛋黄中各种脂肪酸相对含量的相关均很小。蛋黄脂肪的多聚不饱和脂肪酸对饱和脂肪酸的比例（Ｐ／Ｓ）较高（０．６１～０．６２），对血浆ＶＬＤＬ浓度的正反选择均不会影响鸡蛋的这种优良品质     

蛋鸡血浆极低密度脂蛋白浓度的变化规律及其选择效应研究

以雅发祖代种鸡为研究材料．用比浊法测定鸡血浆极低密度脂蛋白（ＶＬＤＬ）浓度．试验结果表明，母鸡血浆ＶＬＤＬ浓度随鸡周龄的增大而持续增加．产蛋期个体间血浆ＶＬＤＬ浓度的变异系数为１５％～６９％，２９周龄母鸡血浆ＶＤＬ浓度的遗传力为０．２４．血浆ＶＬＤＬ浓度与腹脂重、腹胀率、肝脂含量均呈正表型相关趋势．２９周龄血浆ＶＬＤＬ浓度与产蛋前期产蛋量、１８周龄体重、开产日龄、蛋黄重、蛋黄比例、蛋黄蛋白比例的遗传相关系数分别是０．２７，０．３８，－０．３３，０．２３，０．２５，０．２２．     

产蛋母鸡血浆肝及蛋铁硒含量的研究

将 2 78日龄罗曼蛋鸡随机分成 3组 ,以含 2 5mgFe ,含 0 .2mgSe/kg日粮 (对照组 ) ,5 2 5mgFe,1.2mgSe/kg日粮(试验Ⅰ组 ) ,10 2 5mgFe,2 .2mgSe/kg日粮 (试验Ⅱ组 )饲喂 8周 ,结果表明 ,与对照组比较 ,试验组血浆铁硒含量、蛋黄铁硒含量、蛋白硒含量、肝铁硒含量均有大幅度提高。相关性检验表明 ,日粮铁与血浆铁、蛋黄铁 ,血浆铁与蛋黄铁 ,日粮硒与血浆硒、蛋黄硒及蛋白硒 ,血浆硒与蛋黄硒及蛋白硒 ,均呈强正相关 ,P <0 .0 1。这些结果提示 ,通过高铁高日粮可以大幅度提高蛋中铁硒含量 ,产蛋母鸡是日粮中铁硒向蛋中转运的良好载体     

高硒高铁日粮饲喂产蛋母鸡对蛋营养成分的影响

将278日龄罗曼蛋鸡随机分成3组，以含25mgFe，0．2mgSe／kg日粮(对照组)，525mgFe，1．2mgSe／kg日粮(试验Ⅰ组)，1025mgFe，2．2mgSe／kg日粮(试验Ⅱ组)饲喂8周，检测蛋营养成分。结果表明，与对照组比较，试验组蛋黄硒铁含量、蛋白硒含量均有大幅度提高；而蛋内氨基酸含量，蛋白及蛋黄含水量，蛋白及蛋黄蛋白质含量，蛋黄磷脂含量等营养成分未见明显变化。提示高硒高铁日粮饲喂的产蛋母鸡在提高蛋中硒铁沉积量的同时不会对蛋的其他营养分造成不良的影响。     

产蛋母鸡血浆肝及蛋铁硒含量的研究

将278日龄罗曼蛋鸡随机分成3组,以含25 mg Fe,含0.2 mg Se/kg日粮(对照组),525 mg Fe,1.2 mg Se/kg日粮(试验Ⅰ组),1 025 mg Fe,2.2 mg Se/kg日粮(试验Ⅱ组)饲喂8周,结果表明,与对照组比较,试验组血浆铁硒含量、蛋黄铁硒含量、蛋白硒含量、肝铁硒含量均有大幅度提高.相关性检验表明,日粮铁与血浆铁、蛋黄铁,血浆铁与蛋黄铁,日粮硒与血浆硒、蛋黄硒及蛋白硒,血浆硒与蛋黄硒及蛋白硒,均呈强正相关,P＜0.01.这些结果提示,通过高铁高日粮可以大幅度提高蛋中铁硒含量,产蛋母鸡是日粮中铁硒向蛋中转运的良好载体.     

Study on the Relationship between Plasma very Low Density Lipoprotein Concentration and Egg Composition Traits in Layer Type Chickens

The chickens used in this study were from a pure line of brown shell egg-type(YAFA) female grandparents of 17-week-old.Plasma very low density lipoprotein(VLDL) concentration was measured with turbidimetrie assay ,The experimental results showed that there was a close rela-tionship between plasma VLDL concentration and egg composition traits,and a positive phenotypic correlation trend was found betewwn 29-week plasma VLDL concentration and 44-week yolk weght,and the genetic correlation coefficient was 0.234, Both the phenotypic and genetic correlations betewwn 29-week plasma VLD concentration and albumen weight were neg-ative,Significant positive phcnotypie correlations ,were,however,observed between yolk ratio or the yolk/albumen ratio and 29-week plasma VLD concentration and their genetic correlation coeffieients were 0.250 and 0.223,respectively.     

The Influence of Selection for Plasma very Low Density Lipoprotein Concentration upon Production Performance in Layer Type Chickens

The chickens studied were from a pure line of brown shell egg-type(YAFA) female grandparents of 17-week-old.Plasima very low denstiy lipoprotein(VLDL) concentration was measured with turbidimetric assay.The experiment results showed that the phenotypic correla-tions between 29-week or 50-week plasma VLDL concentration and egg production (EP) were positive in the early stage of laying period,but those in the latter stage were negative,Selection for low plasma VLD concentration will decrease the EP in the early stage of laying period but in-crease the one in the latter stage,There was a significant negative phenotypic correlaiton between the atge at first egg (AFE) and 18-week body weight(BW),The phenotypic correlation between 29-week plasma VLDL concentration and the AFE was negative,AFE was influenced by BW and body fatness as well.There was significant positive phenotypic correlation between plasima VLDL concentration and body weights(BWs) at the same stage in laying period and the phenotypic correlation was aslo positive between 29-week plasma VLDL concentration and the BW at middle stage of laying period,indicating that selection for low plasma VLDL concentration would reduce BWs at various stages to different degree.     

The Change of Plasma very Low Density Lipoprotein Concentration Pre-orPost-Feeding and in Conrrelation with Body Fatness Traits in Broiler Chickens

Blood samples were taken from birds,from a commercial line of broiler chicken,being in a fully fed state and in fasting state for 2,4,6 hours respectively at 49d of age and plasma very low density lipoprotein (VLDL) concentration was measured with turbidimetric assay.The experiment results showed that the variation coefficients of plasma VLDL concentration mersured at four different times were 58.11%,74.39%,69.70%,47.83%,respectively for male broilers,and 41.82%,60.87%,59.26%,50.0% for female broilers respectively.Plasma VLDL concentration decreased with the fasting time.There was a significant positive phenotypic correlation between abdominal fat weight,percentage of abdominal fat and plasma VLDL concentration for the birds being in fully feeding state,and the correlation decreased or no longer existed for the bired being in fasting state.The conclusion was that for practically application of plasma VLDL content selected in broiler chicken breeding,blood samples should be collected from birds being in feeding state.     

VLDL双向选择肉鸡群ISSR指纹分析研究

通过对初步进行血浆极低密度脂蛋白（VLDL）双向选择的三世代高、低脂群肉鸡进行ISSR指纹分析，评定其遗传多态性及两群体间的遗传相似系数。60个引物筛选出10个引物用于检测分析；共扩增出62条谱带，其中39个是多态性片段，多态率为63％。高、低脂群群体内个体间遗传相似系数分别为0．9643，0．9766。两群体间的遗传相似系数为0．9481。     

仙人掌提取物对广西麻鸡蛋品质的影响

为研究仙人掌提取物对广西麻鸡生产性能和蛋品质的影响,试验选取38周龄的广西麻鸡1 200只为试验动物进行为期7周的饲养试验。试验鸡随机分为3组,每组两个重复。对照A组饲喂基础饲粮,试验B和C组分别在基础饲粮中添加仙人掌提取物300和500 mg·kg-1,结果表明,试验B和C组的蛋黄比率、哈氏单位、蛋比重显著高于对照A组(P0.05)。说明饲粮中添加仙人掌提取物可显著提高广西麻鸡蛋品质(P0.05)。     

Effect of Divergent Selection for Plasma very Low Denstity Lipoprotein Concentration on Reprod—uctive Performance in Broiler Chickens

ＥｆｆｅｃｔｏｆＤｉｖｅｒｇｅｎｔＳｅｌｅｃｔｉｏｎｆｏｒＰｌａｓｍａｖｅｒｙＬｏｗＤｅｎｓｔｉｔｙＬｉｐｏｐｒｏｔｅｉｎＣｏｎｃｅｎｔｒａｔｉｏｎｏｎＲｅｐｒｏｄ－ｕｃｔｉｖｅＰｅｒｆｏｒｍａｎｃｅｉｎＢｒｏｉｌｅｒＣｈｉｃｋｅｎｓＣｈｅｎＪｉｎｗ...     

仙人掌提取物对广西麻鸡产蛋性能的影响

为研究仙人掌提取物对广西麻鸡产蛋性能的影响,选取38周龄的广西麻鸡1 200只为试验动物进行为期7周的饲养试验.试验鸡群随机分为3组,每组两个重复.对照A组饲喂基础饲粮,试验B和C组分别在基础饲粮上添加仙人掌提取物300和500 mg· kg-1,结果表明,B和C组的产蛋率显著高于A组（P＜0.05）、不合格蛋数极显著低于A组（P＜0.01）.说明仙人掌提取物能显著提高广西麻鸡的产蛋性能.     

极低密度脂蛋白受体的研究

极低密度脂蛋白受体(VLDL-R)是一种存在细胞表面的、可识别多种配体的跨膜蛋白,是含有载脂蛋白E(ApoE)的脂蛋白颗粒的受体,在动物体内富含三酰甘油(TG)的脂蛋白的代谢中发挥重要作用。该受体在禽类机体内发挥着介导卵子发生发育的重要生理功能,在哺乳动物机体中主要是参与脂蛋白代谢,可能还有其他生理功能有待于进一步研究。就极低密度脂蛋白受体的分子结构、分布部位、生物学功能以及其基因序列作了简要综述。     

松针提取物对广西麻鸡产蛋性能的影响

为研究松针提取物对广西麻鸡产蛋性能的影响,选取39周龄的广西麻鸡1 800只为试验动物,进行为期7周的饲养试验。试验鸡群随机分为3组,每组两个重复。对照A组饲喂基础饲粮,试验B、C组分别在基础饲粮中添加松针提取物300和500 mg·kg-1,结果表明,B、C组的产蛋率显著高于A组(P0.05)、不合格蛋数极显著低于A组(P0.01)。表明松针提取物能显著提高广西麻鸡的产蛋性能。