共查询到20条相似文献，搜索用时 234 毫秒
1.
2.
本研究以广东温氏南方家禽育种有限公司的N409品系为实验材料,估计了公、母鸡105日龄体尺性状和腹脂性状的相关性。结果显示:对于公鸡,除胫长外,各性状与腹脂重、腹脂率均呈不同程度的正表型相关,在遗传相关方面,各性状与腹脂重均呈正相关,各性状与腹脂率的相关性则不如腹脂重强;对于母鸡,除体斜长、胫长外,各性状均与腹脂重、腹脂率呈极显著的正表型相关,遗传相关方面,各性状均与腹脂重呈现不同程度的正相关,各性状与腹脂率的相关性则不如腹脂重强。本研究结果提示,胸宽、骨盆宽、体斜长、胫长可以作为腹脂性状的间接选育指标。 相似文献
3.
肉鸡腹脂沉积与重要经济性状关系的研究进展 总被引：3，自引：0，他引：3
现代肉鸡生产是由商品肉仔鸡和肉种鸡生产二大部分组成的。肉仔鸡体脂沉积与体重呈显著的正表型和遗传相关 ,腹脂沉积过多降低了饲料利用率 ,对肉品质也有影响。适当的体脂沉积有利于肉种鸡开产 ,过多的体脂沉积降低了其产蛋量和蛋重。体脂沉积与种蛋受精率和孵化率的关系如何尚未取得一致的看法 相似文献
4.
为研究贵州黄鸡的蛋品质及各指标之间的相关性,随机抽取44周龄贵州黄鸡新鲜种蛋60枚,按照国家规定的方法,在24 h内测定相关指标。结果:贵州黄鸡平均蛋重为(52.74±5.33) g,蛋形指数1.36±0.10,蛋壳厚度(0.35±0.05) mm,蛋黄重(17.55±1.66) g,蛋黄颜色9.26±0.73,蛋白高度(4.72±1.13) mm,哈氏单位平均68.43±4.29。相关性分析表明:蛋壳强度与哈氏单位、蛋壳厚度呈显著正相关(P<0.05);蛋黄重与蛋重呈极显著正相关(P<0.01),与蛋黄比例和蛋壳厚度呈显著正相关(P<0.05);蛋重与蛋黄比例呈极显著负相关(P<0.01),与蛋白高度呈显著正相关(P<0.05);蛋白高度与哈氏单位呈极显著正相关(P<0.01);其他性状间无显著相关性(P>0.05)。 相似文献
5.
《中国畜牧杂志》2021,(9)
本研究选取北京中农榜样蛋鸡育种有限公司531只2个矮小型纯系(记为A系和B系)为实验素材,其中A系254只、B系277只,在85周龄时屠宰母鸡测定体重、肝脏重、腹脂重、卵巢重、卵泡数、全净膛重等指标,并计算屠宰性状指标的遗传参数,分析腹脂率与其他性状的关联性,统计不同腹脂沉积组后期产蛋性能及其后代2～21周龄体重的差异。结果表明:体重、腹脂重、腹脂率属于中等偏下遗传力,全净膛率和发育卵泡数遗传力较低;腹脂率与发育卵泡数、卵巢重均呈遗传负相关,与体重、肝脏重、全净膛率呈遗传正相关。A系母鸡高腹脂组腹脂率与发育卵泡数呈表型负相关(P=0.855),B系母鸡高腹脂组腹脂率与卵巢重呈表型负相关(P=0.697);高腹脂沉积会导致产蛋后期产蛋数下降,腹脂沉积可影响其后代早期平均体重(P0.05)。综上,适当控制母鸡腹脂沉积有利于维持后期的产蛋性能,掌握矮小型纯系蛋鸡屠体性状遗传参数,为通过选育手段改善商品代蛋鸡腹脂沉积和后期产蛋性能奠定基础。 相似文献
6.
散养和笼养条件下二郎山山地鸡蛋肉兼用系蛋、肉品质分析比较 总被引：1，自引：0，他引：1
为比较二郎山山地鸡散养和笼养方式下的蛋肉品质差异,本试验测定了笼养和散养二郎山山地鸡的蛋重、蛋壳强度、蛋黄重、壳色、蛋黄比例、蛋形指数、蛋白高度、蛋黄颜色、蛋壳重、蛋白重、蛋白比例、蛋壳比例等蛋品质和肌内脂肪含量、宰后45 min pH值等重要肉品质。结果显示:(1)蛋重、蛋壳强度在散养和笼养条件下无显著差异(P>0.05);壳色、蛋黄重和蛋黄比例在笼养条件下极显著高于散养条件(P<0.05);而散养条件下的蛋形指数、蛋白高度、蛋黄颜色、蛋壳重、蛋白重、蛋白比例和蛋壳比例极显著高于笼养条件(P<0.05);(2)散养条件下的二郎山山地鸡的45 min pH值和肌内脂肪含量均极显著高于笼养条件(P<0.05)。试验结果说明,在散养条件下饲养的二郎山山地鸡蛋肉兼用系蛋肉品质在总体上均优于笼养条件,二郎山山地鸡蛋肉兼用系适于散养生产。 相似文献
7.
《中国家禽》2017,(13)
为进一步分析纯系蛋鸡育种群体的品系特性,以新杨绿壳纯系蛋鸡和洛岛红纯系蛋鸡为研究对象,比较两个纯系3个产蛋周龄(26、40和60周龄)的蛋品质。结果:(1)新杨绿壳纯系蛋鸡除了蛋壳比例以外,其他指标均受产蛋周龄的极显著影响,蛋重和蛋黄比随着周龄的增加而增加,而蛋黄颜色、蛋白高度、哈夫单位和蛋壳强度随着周龄增加而下降;40周龄蛋壳厚度和蛋壳重显著高于其他周龄(P0.01)。(2)洛岛红蛋鸡的蛋黄比、蛋白高度、蛋壳重和哈夫单位与前者相同;40和60周龄蛋黄颜色极显著低于26周龄(P0.01);40周龄蛋重和蛋壳比例显著大于26和60周龄(P0.01);26周龄蛋壳强度极显著高于其他周龄,40周龄蛋壳强度最低。综上,纯系蛋鸡26周龄内部蛋品质最好。 相似文献
8.
产蛋后期母鸡脂肪沉积量与繁殖性能相关性研究 总被引：1，自引：1，他引：0
旨在探究脂肪沉积量对产蛋后期繁殖性能的影响,为提高种鸡繁殖效率提供基础。选择65只43周龄健康北京油鸡,测定43~65周龄产蛋数,分别在53和63周龄进行孵化性能和蛋品质的测定,根据65周龄腹脂率分为高腹脂组、中等腹脂组和低腹脂组,统计分析3组产蛋数、蛋品质和种蛋孵化性能的差异。结果显示,中等腹脂组产蛋数比高腹脂组高17.02%,比低腹脂组高8.29%;中等腹脂组受精蛋孵化率比高腹脂组高4.70%,比低腹脂组高10.10%,中等腹脂组入孵蛋孵化率比高腹脂组高6.98%,比低腹脂组高10.47%;3组间蛋重、蛋黄重、蛋壳强度和蛋壳厚度无显著差异(P0.05),而高腹脂组蛋形指数显著高于低腹脂组(P=0.05)。综上表明,采取适当措施控制母鸡脂肪沉积量利于后期产蛋性能、蛋形和孵化性能的维持。 相似文献
9.
肉鸡腹脂与皮下脂肪,肌脂率,肝脂率的关系 总被引：5，自引：1，他引：4
在相同的条件下，饲养１１８只狄高和５８只ＡＡ鸡，并于８周龄屠宰测定其腹脂、腹脂率和颈部、胸部、腿部皮下脂肪重；用乙醚抽提法测定了腿肌、胸肌、肝脏的含脂率。结果表明，腹脂重、腹脂率与腿部、胸部、颈部皮下脂肪重呈显著的正相关（Ｐ＜０．０５或Ｐ＜０．０１）；而腹脂重、腹胀率、皮下脂肪重与腿肌、胸肌含脂率的相关性不显著（Ｐ＞０．０５）；而与肝脏含脂率表现为显著的正相关（Ｐ＜０．０５或Ｐ＜０．０１）。 相似文献
10.
《黑龙江畜牧兽医》2020,(17)
为了探究饲粮能量水平对产蛋后期(50～60周龄)肉种鸡胴体品质及肉品质的影响,试验将健康机体状况一致的49周龄AA肉种鸡270羽随机分为3组,分别为高能量组(H组)、对照组(N组)和低能量组(L组),N组饲喂基础饲粮,H组和L组饲粮能量水平分别是N组的120%和80%,进行70 d的饲养试验,试验结束后进行胴体品质和肉品质的测定。结果表明:产蛋后期肉种鸡腹脂率、肌间脂带宽随饲粮能量水平降低极显著降低(P0.01)。与N组相比,L组胸肌红度值(a~*值)显著升高(P0.05);与H组相比,L组肌肉剪切力显著升高(P0.05),胸肌pH_(24)值降低,肌肉粗蛋白含量显著升高(P0.05),粗脂肪含量极显著降低(P0.01)。说明降低饲粮能量水平(80%)可有效降低产蛋后期肉种鸡腹脂率及肌间脂带宽,提高肌肉红度,改善胴体品质及肉品质。 相似文献
11.
12.
试验旨在比较笼养和平养方式对不同品种蛋鸭蛋品质的影响,以期为评价不同饲养方式下的鸭蛋品质提供参考依据。随机选取40周龄笼养和平养的金定鸭（青壳蛋）和山麻鸭（白壳蛋）鸭蛋各30枚于产后24 h内进行蛋品质测定。结果表明,同一品种笼养蛋鸭蛋重极显著大于平养蛋鸭蛋重（P<0.01）,蛋重与蛋壳重、蛋白重和蛋黄重之间均存在极显著正相关（P<0.01）,但不同类型鸭蛋的蛋黄重之间差异不显著（P>0.05）。青壳蛋的蛋壳强度显著高于白壳蛋（P<0.05）,笼养青壳蛋的蛋壳强度亦高于平养青壳蛋（P<0.05）。蛋的比重与蛋壳厚度呈极显著正相关（0.503,P<0.01）,与蛋壳强度的相关系数亦达到0.536（P<0.01）。4种类型鸭蛋的哈氏单位均达到72以上。虽然蛋白重与蛋黄重之间呈极显著正相关（P<0.01）,但蛋白重与蛋黄比率之间却呈极显著的负相关（P<0.01）。蛋的比重与蛋黄重和蛋黄比率之间亦存在显著负相关（P<0.05）。以上结果表明,就蛋品质而言,蛋鸭养殖以采用笼养模式、选择青壳蛋鸭品种为宜。 相似文献
13.
The purpose of this test was to evaluate the egg quality from two breeds of ducks reared in cages and on floor.30 eggs were chosen from each type of eggs,which were from Jinding (green shell) and Shan Partridge ducks (white shell)at 40 weeks-old reared in cages and on floor for egg quality evaluation.The results showed that the egg weight of caged duck was extremely significantly larger than the floor duck (P<0.01) in the same breed,there were very significant positive correlations between the egg weight and eggshell weight,egg-white weight and egg yolk weight (P<0.01),but no significant difference among the egg yolk weights of different types of ducks (P>0.05).The shell strength of green egg was obviously higher than that of white shell eggs (P<0.05),and the shell strength of green egg from caged ducks was higher than that of the green egg ducks on floor.The correlation coefficients of the egg specific gravity and eggshell thickness,the specific gravity and eggshell strength were 0.503 (P<0.01) and 0.536 (P<0.01) respectively.Haugh units of four types of ducks all reached 72 or more.Although there was significant positive correlation between egg-white weight and egg yolk weight (P<0.01),significant negative correlation was existed between egg-white weight and egg yolk ratio (P<0.01).There were significant negative correlations between egg specific gravity and egg yolk weight (P<0.05) and egg yolk ratio (P<0.05).In conclusion,the mode of cage feeding and the breed with green shell were appropriate choices in laying-egg duck production for high egg quality. 相似文献
14.
以雅发褐壳蛋鸡为素材,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,比较了高低脂系间体组成的差异,并研究了中后期血浆VLDL浓度与上述性状的相关程度,进一步探讨了血浆VLDL浓度的选择效应。结果表明:二世代母鸡中后期高脂系体重较高(P<0.05),血浆VLDL浓度与体重呈极显著的表型相关(P<0.01)和中等程度的正遗传相关。62周龄高脂系的腹脂率显著高于低脂系(P<0.05),说明运用血浆VLDL浓度经过二个世代的双向选择,使产蛋鸡中后期体重降低,且对腹脂沉积产生了一定的影响。 相似文献
15.
1. The objective was to estimate heritability, genetic and phenotypic correlations for egg quality traits of Iranian native fowl at the Yazd Breeding Centre. 2. External and internal egg quality traits were measured on 1200 eggs from 794 hens of the 6th generation. A multivariate animal model with restricted maximum likelihood procedure was applied to estimate heritability, genetic and phenotypic correlations for egg quality traits using ASREML. 3. Heritability estimates for external egg quality traits ranged from 0·18 to 0·57 and for internal egg quality traits from 0·24 to 0·60. 4. For external egg quality traits, genetic correlation between egg weight and eggshell thickness (EST) was positive (0·36) and EST showed high genetic correlations with eggshell weight (0·84) and eggshell strength (0·55). This implies that heavier eggs tend to have thicker and stronger shells. 5. For internal egg quality traits, albumen height showed high positive genetic correlations with albumen weight (0·52), albumen index (0·98), yolk height (0·72) and yolk index (0·57). 6. Our results show that it is feasible to improve egg quality in Iranian fowl through selection for albumen height. 相似文献
16.
1. In four trials during consecutive years individually‐caged birds were weighed at first egg, and in the first two trials they were then killed to determine abdominal and skin fat, in order to establish whether there is a minimal body weight and/or body fat pool required for the start of egg production in broiler breeder hens. 2. There were negative correlations ranging from significant to negligible between body weight and age at first egg. For birds of the same strain on a conventional food restriction regimen, the average weight range at first egg in the four trials was 3·3 to 3·7 kg, which may be a strain characteristic. 3. In spite of severe food restriction, all birds were very fat at first egg. The correlations between fat concentration and age at first egg were negative. 4. In mature pullets a minimum concentration of stored, easily mobilised fat may be essential for yolk formation and ovulation. 相似文献
17.
不同周龄母鸡鸡蛋及不同蛋壳质地鸡蛋的蛋品质比较 总被引：1，自引：0，他引：1
本文比较了同一品种不同周龄(26、40周龄和64周龄)母鸡所产蛋的蛋壳品质和蛋品质,包括蛋重、蛋壳相对重、蛋形指数、蛋壳强度、蛋壳厚度、蛋黄颜色、蛋黄指数、蛋黄比率、哈氏单位、蛋清pH值。之后,还比较了该鸡种不同蛋壳质地鸡蛋(正常蛋和砂壳蛋)之间上述指标的差异。结果表明:在不同周龄母鸡所产蛋之间,蛋重、蛋黄指数、蛋黄比率、哈氏单位等均存在显著差异(p<0.05),而蛋壳厚度之间差异不显著(p>0.05)。此外,蛋重、蛋形指数、蛋黄颜色、蛋黄比率随着母鸡周龄的增加呈上升趋势,而蛋壳强度、蛋壳相对重、哈氏单位、蛋黄指数、蛋清pH值呈下降趋势。最后,蛋壳质地不同的鸡蛋(正常蛋与砂壳蛋)之间,蛋重、蛋壳相对重、蛋壳强度、蛋清pH值之间存在极显著差异(p<0.01),而其他参数之间差异不显著(p>0.05)。 相似文献
18.
One-generation divergent selection on large and small yolk proportions in a White Leghorn line 总被引：1，自引：1，他引：0
1. A striking change in egg consumption from shell eggs toward egg products is taking place. Consequently, internal egg quality traits must be seen in a different light, as they may affect the profitability of the egg processing industry. In order to study the possibility of using breeding as a means to alter yolk production, a one-generation divergent selection experiment was set up. The trait was yolk proportion. The effect of hen's age on egg composition was also studied. Genetic parameters for yolk proportion, yolk weight, egg weight and albumen weight were estimated, using a multiple trait animal model, and restricted maximum likelihood. 2. Selection response was obtained for yolk proportion and correlated selection responses for yolk weight and albumen weight. In the 'high line' a decrease in egg weight and an increase in yolk weight was established, whereas in the 'low line', egg weight remained more or less the same and yolk weight decreased slightly 3. Yolk proportion, yolk weight, egg weight and albumen weight all increased with increasing age of the hen in both selection lines. The difference between selection lines in yolk proportion, yolk weight and albumen weight persisted throughout the laying period. 4. Estimated heritabilities for yolk proportion, yolk weight, egg weight and albumen weight were 0.38, 0.22, 0.34 and 0.41 respectively. The genetic correlation between yolk proportion and yolk weight was 0.52, whereas the genetic correlations with egg weight and albumen weight were -0.51 and -0.74 respectively. 5. We conclude that selection can be used to alter yolk production. Selection can be at an early age with a sustained effect throughout the laying period. 相似文献
19.
以褐壳蛋鸡祖代母本种鸡为研究材料，用比浊法测定血浆极低密度脂蛋白浓度。试验结果表明，母鸡８１周龄腹脂重，腹脂率，鲜肝脂肪含量的变异系数分别高达４７％，３９％，４７％。表明这些性状在鸡群中未做过选择。血浆ＶＬＤＬ浓度与腹脂重，腹脂度，肝重，肝脂含量均呈正表型相关趋势。 相似文献
20.
青藏高原地方鸡种——海东鸡与商品鸡蛋品质分析比较 总被引：3，自引：1，他引：2
作者对青藏高原地方鸡种—海东鸡与商品新罗曼鸡的蛋品质及蛋中营养成分进行测定并分析比较。结果表明,海东鸡的蛋重、蛋壳重、蛋白重及蛋白重/蛋重极显著低于新罗曼鸡(P0.01);而蛋形指数和蛋黄重/蛋重极显著高于新罗曼鸡(P0.01);蛋壳厚度和蛋壳重/蛋重海东鸡显著高于新罗曼鸡,且海东鸡的哈氏单位显著高于新罗曼鸡(P0.05);蛋黄和蛋壳强度重二者无显著差异。海东鸡蛋全蛋粗蛋白质含量比新罗曼鸡蛋低21.3%,达到极显著水平(P0.01);粗脂肪含量比新罗曼鸡高18.1%,达到显著水平(P0.05)。 相似文献