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杜洛克,大白,长白三个品种相杂交后繁殖性状杂种优势表现的研究 总被引：2，自引：0，他引：2
在杜洛克、长白、大白三个纯种为基础的杂交繁育配套系中，测定了3个纯种及12个杂交组合的827头次分娩母猪的繁殖性状（产仔总数、产活仔数、初生重、21天成活数、21天个体重、窝重），明确了3个纯种繁殖性状及各杂交组合杂种优势表现情况。结果显示，二元杂交猪比纯种猪在产活仔数、初生重等方面有极显著的杂种优势，三元杂交猪比纯种亲本在产仔总数、产活仔数、初生重、21天成活数等性状上均有极显著的杂种优势；在各正反交组合中，YL组合比LY组合在初生重、21天个体重上有显著的差异，YL优于LY，而在三元杂交组合中，各性状比较均无明显差异，在回交组合中，L．YL组合产仔数明显优于L．LY组合，Y．LY组合21天个体重明显优于Y．YL组合，纯种中在繁殖上L略优于Y，但无显著差异。 相似文献
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互助猪及其杂交猪的肉质比较 总被引：2，自引：2，他引：0
刘强 《青海畜牧兽医杂志》1991,(2):16-18
对互助猪、杜洛克猪和以互助猪为母本,用国内外6个不同品种猪为第一和第二父本的8个杂交组合猪的肉质测定结果:互助猪肉质优良,肌肉干物质、脂肪含量明显高于各杂交组和杜洛克猪(P<0.01),嫩度接近80％,背脂和板油的融点低,肌肉颜色、大理石纹也优于其它各组合;各杂交组猪的眼肌面积比互助猪提高47.8—133.8％(P<0.01),以杜苏互和杜长互为最高,分别增加133.8％、115.4％,瘦肉率比互助猪提高5.0—10.1％,以杜苏互和长苏互较高,分别增加10.1％和9.3％;肌肉pH值以杜苏互、长苏互、杜长互和汉巴互较佳,均比亲本杜洛克猪有明显提高(P<0.05)。由此看出,互助猪虽然眼肌面积小,瘦肉率低,但其与瘦肉型品种的杂交后代,眼肌面积和瘦肉率都有较大提高。就肉质比较而言,杜苏互和长苏互是较好的瘦肉型杂交组合。 相似文献
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不同品种公猪与梅山猪杂交的繁殖性能比较徐筠遐，葛云山，林志宏，葛继金（江苏省农科院畜牧兽医研究所２１００１４）筛选出以梅山猪为母本，外来瘦肉型猪为父本的最佳二元组合，来建立和发展太湖猪为母系亲本的繁育体系，特进行了本项试验。＊试验于１９８９～１９９０... 相似文献
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《畜牧兽医科技信息》2017,(3)
<正>荷包杂交猪是以优质、纯种瘦肉型猪长白做第一父本,与非保种的荷包猪母猪做母本所生产的二元杂交猪及其后代母猪与纯种杜洛克做终端父本所生产的三元杂交猪。1试验猪选择1.1选择美系纯种长白公猪、杜洛克公猪与荷包猪非保种繁育母猪杂交,所生产的二元及三元杂交猪。1.2选择健康无病、体况良好、体重相近(25±1.28kg)的荷包猪(对照组)、二元及三元断奶仔猪各20头,共计60头,分 相似文献
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黑龙江省猪杂交方案和杂交组合的经济效益比较 总被引：1，自引：0，他引：1
以黑龙江省猪品种资源构成及养猪生产具体条件为依据，应用系统动态学的原理和方法，对黑龙江省建立不同杂交方案，不同品种杂交组合的猪完整繁育体系的经济效益进行了预测和比较分析。按益本比，每头种母猪和每头商品猪获得利，均得出三元杂交方案繁育体系收益最大，回交居中，二元杂交方案最低。据此，对我省不同地区建立完整繁育体系提出了建议。 相似文献
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为建立高繁殖效率和高品质猪肉的商品生产体系提供理论依据，引进加系杜洛克、长白、大约克、皮特兰，从繁殖性能、生长性能和胴体性能3个方面对4种杂交组合进行比较。结果表明，在二元杂交母猪中长大母猪表现最佳：在三元杂交优质商品瘦肉型猪，杜长大或杜大长是高产高效最佳组合。试验结果还表明，最大限度地提高养猪效益，必须在种、料、舍、病、法等方面采取综合配套措施方能奏效。 相似文献
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对5个杂交组合羔羊的生产性能进行了测定。结果表明:羔羊哺乳期平均日增重2个三元杂交组合高于3个二元杂交组合;断奶育肥期日增重德克塞尔×无角道赛特×小尾寒羊(TL×PD×XW)和萨福克×无角道赛特×小尾寒羊显著高于无角道赛特×小尾寒羊(PD×XW)和德克塞尔×小尾寒羊(TL×XW)(P<0.05);料重比TL×PD×XW和SK×PD×XW极显著高于PD×XW和TL×XW(P<0.01),显著高于SK×XW(P<0.05);胴体重、屠宰率、眼肌面积、胴体净肉重等指标2个三元杂交组合显著或极显著高于3个二元杂交组合。建议在半干旱地区开展肉羊经济杂交时,以SK×PD×XW组合最好。 相似文献
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Tsutomu Furukawa Keijiro Nirasawa Kazuo Ishii Le T. Thuy Masahiro Satoh 《Animal Science Journal》2013,84(3):200-205
Conserving pig genetic resources and improving their productivity is important to increase returns over investment in developing countries. The purebred, first‐cross, rotational cross and backcross matings representing production systems based on pig breeds indigenous to the country and exotic pig breeds were investigated. The number of pigs in the nucleus and commercial herds necessary to produce a defined quantity of pork was considered. The amount of heterosis between the indigenous and exotic breeds, superiority in meat production, and degree of inferiority in reproductive performance of the exotic breed compared with that of the indigenous breed were investigated. The number of breeding pigs in the whole system was in the following order: pure breeding (PB) > first‐cross (F1) > rotational cross (RC) > backcross (BC) systems. The number of breeding pigs in the nucleus herds of the RC and BC systems was smaller than that in the nucleus herds of the PB and F1 systems. The degree of inferiority in reproductive performance of the exotic breed compared with that of the indigenous breed affected the efficiency of the production system. 相似文献
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Twenty-seven crosses derived from three random-mating, unselected strains of mice (SWO, J, PGH) with 16 matings/pureline or cross were cohabited continuously and monogamously for 365 d to evaluate long-term reproductive performance of the parents. Data from 3,249 litters born were analyzed to study the effects of parity (number of litters) and type of cross (pureline, two-way, backcross, three-way) on the following traits: 1) continuity of reproduction (COR), 2) litter size at birth (LSB), 3) age at first litter (AFL), 4) fraction alive at birth-the ratio of number born alive to LSB (FAB), 5) birth to birth interval (BBI) and 6) reproductive rate-the ratio of number born alive to birth to birth interval (RRT). Reproductive rate was also studied in a cumulative manner rather than on a per parity basis by regressing cumulative number born alive on cumulative birth to birth interval. Parity effects were important (P less than .01) for all traits measured. Differences among cross-types were highly significant for COR, LSB and RRT. Three-way crosses were more productive than backcrosses, and both were superior to two-way and pureline matings. Uniformity was greater among three-way crosses for all traits except COR. Cross-types differed importantly in the pattern of change in performance over parities for COR, LSB, FAB, RRT and cumulative number of live young (P less than .01). Number of parities were most important for variation in longevity of reproduction (COR) and somewhat for litter size (LSB). Mean and cumulative reproductive rates were influenced more by longevity and litter size than by interval between births. 相似文献
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试验以通城猪为母本,长白猪（瑞典）、大白猪（英国）为父本进行三元杂交,对两个三元杂交猪（长×（大×通）、大×（长×通）,简称为长×大×通、大×长×通）及亲本分别从生长性能、胴体性状及肉品质方面进行了比较。结果显示,长×大×通和大×长×通三元杂交猪的生长性能、胴体性状及肉品质均表现出较好的杂种优势。长×大×通三元杂交猪的测定期平均日增重、料重比、活体背膘厚、剪切力、大理石纹和肌内脂肪含量的杂种优势率分别为12.54%、-13.89%、10.39%、-8.71%、-8.33%和8.57%,大×长×通的杂种优势率分别为10.81%、-11.05%、10.55%、-6.50%、6.67%和2.44%。长×大×通和大×长×通两者比较,长×大×通三元杂交猪的试验期平均日增重、眼肌面积及腿臀肉骨率分别为843.4 g/d、34.51 cm2和73.54%,大×长×通三元杂交猪分别为808.6 g/d、31.45 cm2和70.67%,二者差异均显著（P<0.05）。综上所述,以通城猪为母本进行的两个三元杂交猪的生长和胴体性状显著优于亲本通城猪,肉质显著优于亲本长白猪和大白猪,且长×大×通组合优于大×长×通组合。 相似文献
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金华猪繁殖性状的统计学分析 总被引：1，自引：1，他引：0
采用金华猪场1979～1999年金华猪的繁殖性能生产记录,测定了2355头金华母猪(纯繁)和金华猪(K)与约克夏(Y)、长白(L)、杜洛克(D)、汉普夏(H)杂交后代的繁殖性状。综合考虑各性状的各种固定效应,并建立各性状的固定效应模型,对其进行方差分析,计算各性状的最小二乘均数(LSM),对影响较大的固定效应在各观察水平上的LSM进行分析与比较。固定效应分析结果表明:品种、胎次、季节、年份对产活仔数、60日龄头数的影响极显著(P<0.01)。而产仔数受胎次、季节、年份的影响极显著(P<0.01)。金华猪纯繁组以及LK×D、K×L杂交组的产仔数、产活仔数较高,K×L、K×Y杂交组合的60日龄头数较高。而其他外来品种之间杂交组合的繁殖性状显著低(P<0.01)。说明金华猪具有高产的优良特性。金华猪产仔数、产活仔数随胎次逐渐递增,6～7胎达到高峰。金华猪夏季产仔数最高为15.72±1.66,显著高于秋、春、冬(P<0.01)。产活仔数春、夏、秋季无差异(P>0.05),但高于冬季(P<0.05)。1982～1987年间金华猪无论是产仔数还是产活仔数整体都维持较高的水平。 相似文献
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3个地方品种猪血液生化指标分析 总被引：1，自引：0，他引：1
为了解中国地方猪种的血液生化指标,试验用Monarch660全自动生化分析仪检测了通城猪、陆川猪和宁乡猪3个地方猪种24项血液生化指标,统计结果表明,3个品种间有6项指标差异极显著(P＜0.01),通城猪和宁乡猪间有4项指标差异不显著(P＞0.05),陆川猪和宁乡猪间有3项指标差异不显著(P＞0.05)。通过3个地方猪品种间同一指标的比较,以及与人参考值、中国小型猪品种、其他地方猪品种和国外引进猪品种比较,为中国地方猪品种资源的合理保护和利用提供科学依据。 相似文献
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Twenty-seven crosses of mice derived from three random-mating, unselected strains (SWO, J. PGH) with 16 matings/pureline or cross were cohabited continuously and monogamously for a 365-d reproduction period to evaluate lifetime reproductive performance of the parents. Data from 3,249 litters born (2,792 surviving to weaning) were analyzed to study the effects of parity (number of litters) and type of cross (pureline, two-way, backcross, three-way) on certain traits measured at weaning (21 d). The traits evaluated were 1) weaning to weaning interval (WWI), 2) litter size at weaning (LSW), 3) fraction alive at weaning (FAW)-the ratio of LSW to number born alive, 4) total litter weight at weaning (LWT), 5) pup weight at weaning (PWT), 6) weaning weight per pup observed alive at birth (WPP), 7) parental feed consumption per day (FPD) and 8) parental costs (PCT). Cost per live weanling animal was estimated as the ratio of cumulative parental costs to cumulative number weaned. Cost per unit of weaning weight was defined as the regression of cumulative parental costs on cumulative litter weight. Parity effects were important (P less than .01) for all traits measured. Type of cross effects were noted for LSW, LWT, PWT, WPP, FPD (P less than .01) and PCT (P less than .05). A parity X cross-type interaction was expressed for WWI, LSW, PWT, WPP, FPD (P less than .01) and FAW (P less than .05). Three-way crosses were more productive than backcrosses, two-way crosses and pureline matings for all traits studied. Three-way crosses displayed the smallest cost per animal weaned and smallest cost per unit of weaning weight. The influence of parity on traits measured at weaning was less than for traits measured at birth. Weight per pup born alive (WPP) was found to be a better indicator of reproduction and lactation ability than LWT because WPP accounts for preweaning mortality. 相似文献
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In order to compare the genetic diversity and phylogenetic relationships between Guangxi pig breeds and three exotic pig breeds,one pair of primers was used to amplify 85 mtDNA D-loop sequences of five Guangxi pig breeds (Bama Xiang pig,Dongshan pig,Guizhong spotted pig,Luchuan pig,Huanjiang Xiang pig),and we downloaded 45 mtDNA D-loop sequences of three exotic pig breeds (Duroc,Yorkshire,Landrace) from GenBank.Then the haplotype,genetic diversity and phylogenetics analysis were carried out.The results showed that 38 haplotypes were identified in 130 sequences,and the mean distances among Guangxi pig breeds were smaller than that among Duroc,Landrace and Guangxi pig breeds.The NJ phylogenetic tree classified all samples into two clusters.One contained all of Guangxi pig breeds and partial Yorkshire,the other was composed wholly of exotic pig breeds,which mean there were two distinct maternal origins.In the cluster of Guangxi pig breeds,Luchuan pig were clustered,and the others were rather dispersive.It indicated that Luchuan pig had simple maternal bloods,and the other breeds had complex maternal bloods,and they had gene flow with each other.The maternal pig resources in Guangxi were not affected by the introduction of exotic pig breeds,and they were still suitable for use as a female parent in their development and utilization. 相似文献
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J J Urick O F Pahnish B W Knapp W L Reynolds W L Milmine 《Journal of animal science》1989,67(10):2603-2608
Data collected from steer and bull progeny, fed to a constant final feedlot weight over 11 yr, were used to estimate heterosis in post-weaning feedlot growth and carcass traits in two-way and three-way rotational crossing systems and a breed composite from crossing Hereford, Angus and Charolais breeds. Steer and bull progeny from matings of beef x Brown Swiss-cross sires and dams also were compared with the straight beef breeds and beef crosses. Growth traits evaluated were initial weight on test, 112-d weight, total feedlot average daily gain and total days from initial to final weight. Carcass traits included hot carcass weight, dressing percentage, rib eye area, 12th-rib fat thickness, kidney, pelvic and heart fat, yield grade and marbling score. Heterosis estimates for calves of all crossing systems were significant for initial and 112-d weight and for saving of days in the feedlot, but not for average daily feedlot gain. Heterosis estimates were small and nonsignificant for most carcass traits except for fat traits in specific crosses. Males from Hereford and Angus sires mated to Angus x Hereford dams had higher (P less than .10) backfat than did the parental average. Male progeny from Charolais ranked higher (P less than .10 to P less than .01) than calves from Hereford and Angus sires for most growth traits. Progeny from Charolais sires were more desirable (P less than .10 to P less than .01) for traits related to cutability, but they had less (P less than .05 to P less than .01) marbling than calves of Angus sires.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献