共查询到19条相似文献，搜索用时 444 毫秒
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本文对常见的德系、法系、美系三个品系獭兔进行了繁殖性能综合比较。试验结果表明:美系獭兔受胎率、窝产仔数、窝产活仔数、仔兔成活率、仔兔初生重、断奶成活率分别为86.67%、8.08、7.73、95.71%、44.73、89.55%;法系獭兔的试验结果为76.67%、7.70、7.21、94.92%、44.21、88.33%;德系獭兔的试验结果为:73.33%、7.32、6.36、87.34%、49.55、78.57%,经检验美系獭兔的窝产仔数、窝产活仔数、仔兔成活率和断奶成活率均显著高于法系和德系獭兔,仔兔初生重以德系最高,与其他两系比较差异显著。三品系受胎率差异不显著。 相似文献
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《养猪》2015,(6)
以262窝PIC母猪所产的2 396头仔猪为研究对象,探讨窝产活仔数对仔猪初生重、28日龄断奶重及断奶成活率的影响。结果表明,随着窝产活仔数的增加,仔猪初生窝重、28日龄断奶窝重增加,断奶成活率降低。不同窝产活仔数间的初生窝重差异极显著(P0.01),窝产活仔数9~11头间的断奶窝重差异不显著,但极显著大于窝产活仔数6、7头(P0.01),断奶成活率以窝产活仔数6~11头较好(90%以上);不同窝产活仔数间的初生个体重差异不显著(P0.05),窝产活仔数6~10头间的断奶个体重差异不显著(P0.05),极显著大于窝产活仔数11头和12头(P0.01)。窝产活仔数与初生窝重、28日龄断奶窝重呈极显著正相关,相关系数分别为0.917和0.589;与初生个体重呈负相关,相关系数为-0.105;与28日龄断奶个体重及28日龄断奶成活率呈极显著负相关,相关系数分别为-0.417和-0.581。本试验条件下,窝产活仔数在10~11头之间可以取得较好的经济效益。 相似文献
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有机螯合锰添加水平对母貂繁殖性能及仔貂生长性能的影响 总被引：2，自引：0，他引：2
本试验旨在探讨繁殖期母貂饲粮中锰的适宜量.试验选取150只平均体重为(1005±113)g的健康成年母貂,根据随机区组法分成5组,每组设30个重复,每个重复1只水貂.各组水貂分别饲喂在基础饲粮中添加0(Ⅰ组)、15(Ⅱ组)、50(Ⅲ组)、100(Ⅳ组)和500mg/kg(V组)锰的试验饲粮.锰以有机螯合锰形式添加,基础饲粮中锰含量约为25mg/kg.试验时间为2011年1月26日至2011年6月23日.结果表明:饲粮有机螯合锰添加水平对母貂血清雌二醇与孕酮含量、妊娠天数、受配率、产仔率、窝产仔数、窝产活仔数,以及仔貂初生窝重、断奶成活数、断奶成活率、1日龄和7日龄平均个体重均无显著影响(P＞0.05),但母貂产仔率、窝产仔数、窝产活仔数,以及仔貂断奶成活数、断奶成活率有随着锰添加水平的升高而增加的趋势.饲粮中添加有机螯合锰对配种跨度影响不大,但能够缩短平均初配持续天数,使配种更为集中.饲粮有机螯合锰添加水平对仔貂断奶窝重、15日龄和45日龄平均个体重及1～45日龄平均日增重的影响差异显著(P＜0.05).仔貂断奶窝重随着锰添加水平的升高先增后降,Ⅳ组、V组显著高于Ⅱ组(P＜0.05)；仔貂15日龄平均个体重随着锰添加水平的升高而降低,Ⅰ组、Ⅱ组与V组相比差异达到显著水平(P＜0.05)；仔貂45日龄平均个体重和1～45日龄平均日增重均以Ⅱ组最小,与Ⅰ组相比有显著差异(P＜0.05).本试验条件下,综合母貂繁殖性能及仔貂生长性能,建议繁殖期母貂基础饲粮锰含量在25mg/kg左右时,锰(有机螯合锰形式)的添加水平为100mg/kg,即饲粮中锰总含量在125mg/kg左右. 相似文献
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《饲料工业》2017,(7):27-30
试验旨在研究母猪日粮中添加多肽菌素对妊娠母猪繁殖性能和新生仔猪生长性能的影响。试验选取胎次、体况相近,预产期前45 d的母猪23头,随机分为2组,试验组12头,对照组11头。每头母猪单栏饲喂,作为一个重复。对照组饲喂基础日粮,试验组在基础日粮中添加2 g/kg多肽菌素。试验期69 d(妊娠期45 d,哺乳期24 d)。结果表明:(1)试验组母猪窝产仔总数比对照组高2.98%,窝产活仔数比对照组高4.98%,窝产健仔数比对照组高6.95%,健仔率比对照组高3.90%,但差异均不显著(P0.05)。(2)试验组仔猪初生窝重、初生个体重、断奶窝重、断奶个体重、平均窝增重及平均个体增重均比对照组显著提高(P0.05);(3)试验组仔猪初生窝重均匀度及断奶窝重均匀度分别比对照组提高32.23%和38.78%,差异极显著(P0.01)。说明妊娠母猪日粮添加2 g/kg多肽菌素可提高妊娠母猪繁殖性能和初生仔猪生长性能,提高生猪养殖的实际效益。 相似文献
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以美系(A系)和德系(G系)獭兔为基础育种群体,进行正、反交及其子代杂交。其中选择美系(A系)和德系(G系)獭兔公兔各20只,母兔各200只左右;进行正、反杂交试验,并以其杂种后代美德獭兔(AG系)和德美獭兔(GA系)继续进行杂交试验;并以公兔组建家系,对所有杂交组合的繁殖性能和后代体重生长性能进行系统测定,优化杂交组合,选择优良家系。美系与德系獭兔正反杂交组合的繁殖性能均大于德系獭兔亲本(P<0.01),在亲本中,美系獭兔繁殖性能显著优于德系獭兔(P<0.01);在所有杂交组合中,以德美獭兔♂×美德獭兔♀组合的平均产仔数(8.18只)、初生窝重(436.41 g)、断乳活仔数(7.6只)为最高,杂交优势率亦最高。美系獭兔♂×德系獭兔♀杂交组合家系间的产仔数、断乳活仔数、断乳成活率等繁殖性状总体上差异不显著(P>0.05),部分家系间初生窝重有显著差异。德系獭兔♂×美系獭兔♀杂交组合家系间仅少数家系间初生窝重有显著差异(P<0.05);德美獭兔♂×美德獭兔♀家系间的产仔数、初生窝重、断乳活仔数、断乳成活率等繁殖性状均无显著差异(P>0.05)。以德美獭兔(GA)♂×美德獭兔(AG)♀为最佳杂交组合。 相似文献
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试验为探究海狸色獭兔与皱襞型獭兔不同交配组合生产性能比较,随机选取6~7月龄健康皱襞型獭兔和海狸色獭兔各40只（30只母兔和10只公兔）,进行不同交配组合试验,分别为海狸纯繁组（海狸色獭兔（♂）×海狸色獭兔（♀））、皱襞纯繁组（白色皱襞型獭兔（♂）×白色皱襞型獭兔（♀））、正交组（海狸色獭兔（♂）×白色皱襞型獭兔（♀））和反交组（白色皱襞型獭兔（♂）×海狸色獭兔（♀））,测定母兔繁殖性能和后代生长性能、屠宰性能及被毛品质。结果显示：正交组初生窝重320.71 g、产仔数6.71只、泌乳力1 727.43 g、仔兔断奶成活率83.91%、仔兔断奶窝重5 304.14 g、幼兔料重比4.06、屠宰率62.43%、皮张面积1 160.20 cm2、被毛密度15 951.70根/cm2、被毛细度16.32 μm、粗毛率6.83%;反交组初生窝重315.14 g、产仔数6.52只、泌乳力1 710.00 g、仔兔断奶成活率80.19%、仔兔断奶窝重4 814.82 g、幼兔料重比4.30、屠宰率62.93%、皮张面积1 172.20 cm2、被毛密度16 092.01根/cm2、被毛细度16.43 μm、粗毛率6.78%,经比对两组间差异均不显著（P>0.05）;而海狸色纯繁组的初生窝重、产仔数、泌乳力、仔兔断奶成活率、仔兔断奶窝重、皮张面积、被毛密度、被毛细度均较皱襞型纯繁组低、而幼兔料重比、屠宰率及粗毛率均较皱襞型纯繁组高,经比对两个纯繁组间除料重比、屠宰率、被毛细度和粗毛率差异不显著外（P>0.05）,其他各指标差异均显著（P<0.05）。综上所述,正交组合亲代的繁殖性能及F1代的生长性能和屠宰性能均略好于反交组合;而反交组合F1代的被毛品质略好于正交组合。 相似文献
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ZHAO Yue-ping YANG Cui-jun SUN Quan-wen WU Shu-qin WU Zhan-fu HAO Rong-chao LU Jing MA Meng-pan REN Ling-ling 《中国畜牧兽医》2017,44(12):3578-3584
In order to compare the production performance of different mating combination between Castor Rex rabbit and Plicae Rex rabbit,40 Castor Rex rabbit (10 ♂ and 30 ♀) and 40 Plicae Rex rabbit (10 ♂ and 30 ♀) with 6 to 7 month old were selected.Hybrid testing was conducted using Plicate Rex rabbit and Castor Rex rabbit as crossing parents which were Castor Rex rabbit pure breeding (Castor Rex rabbit ♂×Castor Rex rabbit ♀),Plicate Rex rabbit pure breeding (Plicae Rex rabbit ♂×Plicae Rex rabbit ♀),orthogonal combination (Castor Rex rabbit ♂×Plicae Rex rabbit ♀)and reciprocal combination (Plicae Rex rabbit ♂×Castor Rex rabbit ♀).The reproductive performance of rabbits does and the growth performance,the slaughter performance and wool quality of their offsprings were measured respectively. The results showed that the neonatal weight of litter,litter size,lactescence,survival rate,weaning weight of litter,F/G,slaughter rate,skin area,hair density,hair fineness and coarse wool rate of orthogonal combination were 320.71 g,6.71,1 727.43 g,83.91%,5 304.14 g,4.06,62.43%,1 160.20 cm2,15 951.70/cm2,16.32 μm and 6.83%,respectively,while that of reciprocal combination were 315.14 g,6.52,1 710.00 g,80.19%,4 814.82 g,4.30,62.93%,1 172.20 cm2,16 092.01/cm2,16.43 μm and 6.78%,respectively,and the differences between reciprocal combination and orthogonal combination were not significant (P>0.05).The F/G,slaughter rate and coarse wool rate of F1 in Castor Rex rabbit pure breeding were higher than that of Plicate Rex rabbit pure breeding,while the other indexes were all lower than Plicate Rex rabbit pure breeding,of which the differences between two pure breeding, except F/G,slaughter rate,hair fineness and coarse wool rate, were significantly different (P<0.05).In conclusion,the reproductive performance of parental generation and growth and slaughter performance of F1 in orthogonal combination was slightly better than that of reciprocal combination,while the wool quality of F1 in reciprocal combination was better than orthogonal combination. 相似文献
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《Livestock Science》2006,99(1):69-77
Economic values or weights measure the net economic gain per unit genetic increase of a given trait. These were derived for sow productivity traits for use as weighting factors in a dam line selection index used by purebred or nucleus dam line breeders. The profit function approach was used in order to provide flexibility to alternative production systems, market requirements or population trait levels. The approach accounted for constraints on perinatal survival rate imposed by larger birth litter sizes. The effect of accounting for these constraints was to reduce the economic value of birth litter size as the population average increased; without this, the economic weight for litter size was constant. Weights for the other traits were not affected. Economic weights were calculated for both the 100 kg finished pig and the 25 kg feeder pig market, and for a range of average birth litter sizes, with constant values for all other traits, using average market conditions, prices and costs in Canada as an example. The relative importance of litter size for the finished pig market decreased from 64% of the total breeding value when average litter size was 8 pigs to 29% when average litter size was 20 pigs, whereas that of perinatal survival increased from 17% to 42%, and that of survival to weaning increased from 7% to 18%. The relative importance of litter size for the feeder pig market also decreased from 45% to 15% as average litter size increased from 8 to 20 pigs, whereas that of piglet weaning weight increased from 22% to 41%, that of perinatal survival increased from 12% to 22% and that of survival to weaning increased from 5% to 9%. The relative importance of age at puberty and weaning to conception interval were both less than 8% of the total in both markets at all litter sizes. These results show that economic weights for litter size designed for populations with relatively small litter sizes should be reduced when the average litter size becomes large and more emphasis should be placed on other traits, particularly perinatal survival. 相似文献
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选择年龄、体重基本一致,生长发育正常的健康獭兔种母兔24只,随机分成对照组以及A、B、c3个试验组,每组6只,对照组饲喂养殖场现有日粮（蛋白水平为15％）,试验组分别饲喂蛋白质水平为16％、18％、20％的日粮,研究不同蛋白质水平对獭兔繁殖性能的影响。结果表明。不同营养水平对窝产仔数、初生窝重没有明显影响,各组差异不显著（P〉0．05）,但对泌乳力、断奶窝重、断奶个体重等有明显影响。B组的泌乳力、断奶窝重与对照组相比差异显著（P〈0．05）,分别比对照组提高47．6％和1573．42g;断奶个体重,A组和B组均显著高于对照组（P〈0．05）,比对照组分别高30．9％和47．4％,B组显著高于A组（P〈0．05）,比A组高12．6％,C组与对照组差异不显著（P〉0．05）;各组断奶成活数、成活率差异不显著（P〉0．05）。 相似文献
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对产后母猪和断奶仔猪饲喂有效微生物菌群(EM),研究其对仔猪生产性能的影响。从产前7d开始给母猪基础饲料中添加5mL/kg的EM菌液,选产仔数不少于8头的3头母猪及其仔猪连续饲喂EM菌28d,仔猪进行断奶,统计母猪的增重、仔猪初生重、断奶重,仔猪成活率等,分析添加EM菌后对母猪生产性能的影响。在这24头断奶仔猪饲料中添加EM菌的饲料,饲喂至60日龄,统计仔猪的增重、采食量、料重比、发病数等,分析EM菌断奶仔猪生产性能的影响。另外选取3头同品种、同批次生产、产仔数相同的母猪及其仔猪饲料中不添加EM菌作为对照。结果表明,母猪产后日均采食量较对照组提高12.07%,仔猪的初生重较对照组提高15.90%,产活仔数提高了12.09%,断奶重增加9.09%,断奶头数增多20.99%,断奶成活率提高8.81%。断奶后仔猪试验组的平均采食量较对照组提高10.26%,料重比降低了7.14%,发病率下降了50.03%。说明EM菌对母猪和仔猪的生产性能均有提高作用,研究结果为EM菌在生猪养殖中的应用提供了基础资料。 相似文献
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饲料中加硒提高獭兔繁殖性能的应用试验 总被引：1，自引：0，他引：1
2009年,在獭兔日粮中添加0.18 mg/kg硒,与2007、2008年未添加硒的獭兔进行繁殖性能比较,试验结果受胎率提高了5.95%,平均窝产仔数提高了1.5只,初生平均窝重提高了32.86g,初生平均个体重提高了7.68 g,平均泌乳力提高了174.46 g,断奶窝重提高了258.11 g,断奶个体重提高了41.0 g,断奶成活率提高了10.55%。表明了在獭兔的日粮中添加0.18 mg/kg的硒,对繁殖性能的提高极显著（P〈0.01）。 相似文献
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为观察复方中草药制剂对母猪分娩和泌乳效果的影响,试验选择妊娠80-90 d的68头妊娠母猪,按配种日龄、胎次、体况、品种随机均分为中草药制剂组和对照组,每组34头,每头母猪为1个重复。两组基础饲粮相同,中草药制剂组在基础饲粮中按每吨300 g添加中草药制剂,试验期为妊娠80 d至断奶。结果表明,与对照组相比,中草药制剂组窝均产活仔数和断奶窝均仔猪数分别提高0.93头（P＜0.05）和1.09头（P＜0.01）;产活仔率和健仔率分别提高5.91和4.52个百分点;仔猪初生个体均重、断奶个体均重、仔猪平均日增重分别提高0.05 kg、0.5 kg、22.6 g,差异均显著（P＜0.05）。中草药制剂可有效提高母猪分娩质量和泌乳水平。 相似文献