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1.
凉山半细毛羊新品种的育成,是采用表型选择和基因型选择相结合产生的结果。在初生期、断奶期、育成期和成年期采取表型鉴定、逐步选择淘汰的制度。根据羔羊断奶期性状与育成期性状之间的显著相关性对羔羊单性状进行早期选择。应用同期发情与后裔测验相结合的方法,对种公羊基因型值用BLUP法进行选择。同时,加强育种工作的组织领导,组建独具特色的三级繁育体系,改善育种羊群的饲养管理条件,圆满完成了国家下达的半细毛羊新品种选育的任务,填补了国内粗档半细毛羊品种的空白。 相似文献
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《中国畜牧杂志》2019,(3)
试验旨在探讨日粮钙水平对空怀期云南半细毛羊生长性能、配种前血清生化指标和繁殖相关激素的影响,为开展空怀期云南半细毛羊营养需要量研究提供参考。选用50只体况良好、体重相近、38月龄的经产2胎空怀云南半细毛羊,随机均分为5组,分别饲喂0.40%(无外源钙)、0.45%、0.53%、0.66%、0.85%5个钙水平的日粮。预试期14d,正试期30d。结果表明:0.53%钙水平组云南半细毛羊的总增重、平均日增重、平均日采食量、耗料增重比等指标相对优于其他组;0.40%钙水平日粮组的血清钙最高,血清碱性磷酸酶、甲状旁腺素、钙、磷组间差异不显著(P>0.05);繁殖相关激素各组间表现不一,0.40%钙水平组雌二醇水平最高(P>0.05)。在日粮磷水平为0.20%水平条件下,0.53%钙水平组的空怀期云南半细毛羊表现出较好的生长性能,可为临配种前生理生化和激素水平提供较好准备;增加日粮钙水平,未见对以上指标有明显的正向增强作用,可能与日粮钙磷比失衡有关。 相似文献
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为研究日粮蛋白质水平对云南半细毛羊空怀母羊能量代谢的影响,试验选择25只云南半细毛羊空怀母羊,平均分为5个组,分别饲喂蛋白质水平为8.4%、10.0%、12.3%、13.6%、15.9%的日粮,用全收粪法进行消化代谢试验,试验期共19 d,预试期14 d,正试期5 d。结果表明:(1)日粮蛋白质水平对总能摄入量无显著影响(P > 0.05)。(2)从组1到组5粪能逐渐下降,且组3、组4、组5较组1分别降低了10.5%、11.4%、13.7%(P < 0.05),组5较组2降低了9.5%(P < 0.05)。(3)从组1到组5尿能逐渐增加,除组2与组1、组3间差异不显著(P > 0.05)外,其余组间差异极显著(P < 0.01)。(4)组4和组5总能消化率较组1极显著提高13.2%和11.8%(P < 0.01),其余各组差异不显著(P > 0.05)。组4总能代谢率较组1极显著提高9.8%(P < 0.01),其余各组差异不显著(P > 0.05)。对于消化能代谢率,组1和组2差异不显著(P > 0.05),组3、组4和组5依次显著降低(P < 0.05)。(5)蛋白质采食量与总能消化率、消化能代谢率间的回归方程分别为:Y=0.917X+45.872(R2=0.853)|Y=-0.370X+87.735(R2=0.899)。综上,日粮蛋白质水平与粪能呈负相关,与尿能呈正相关。日粮蛋白质水平为13.6%时,总能消化率和总能代谢率均较8.4%蛋白质水平组极显著提高。总能消化率随蛋白质采食量的提高而线性升高,消化能代谢率则随蛋白质采食量的提高而线性降低。
[关键词] 蛋白质|云南半细毛羊|空怀期|能量代谢 相似文献
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《农业科学学报》2019,18(10):2351-2360
As a member of the Frizzled family, Frizzled3(FZD3) is a receptor of the canonical Wnt signaling pathway and plays a vital role in mammalian hair follicle developmental processes. However, its effects on wool traits are not clear. The objectives of this study were to identify the single nucleotide polymorphisms(SNPs) and the expression patterns of FZD3 gene, and then to determine whether it affected wool traits of Chinese Merino sheep(Xinjiang Type) or not. PCR-single stranded conformational polymorphism(PCR-SSCP) and sequencing were used to identify mutation loci, and general linear model(GLM) with SAS 9.1 was used for the association analysis between wool traits and SNPs. Quantitative real-time PCR(q RTPCR) was used to investigate FZD3 gene expression levels. The results showed that six exons of FZD3 gene were amplified and two mutation loci were identified in exon 1(NC_019459.2: g.101771685 TC(SNP1)) and exon 3(NC_019459.2: g.101810848, AC(SNP2)), respectively. Association analysis showed that SNP1 was significantly associated with mean fiber diameter(MFD)(P=0.04) and live weight(LW)(P=0.0004), SNP2 was significantly associated with greasy fleece weight(GFW)(P=0.04). The expression level of FZD3 gene in skin tissues of the superfine wool(SF) group was significantly lower(P0.05) than that of the fine wool(F) group. Moreover, it had a higher expression level(P0.01) in skin tissues than in other tissues of Chinese Merino ewes. While, its expression level had a fluctuant expression in skin tissues at different developmental stages of embryos and born lambs, with the highest expression levels(P0.01) at the 65 th day of embryos. Our study revealed the genetic relationship between FZD3 variants and wool traits and two identified SNPs might serve as potential and valuable genetic markers for sheep breeding and lay a molecular genetic foundation for sheep markerassisted selection(MAS). 相似文献
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OBJECTIVE: To measure the production and amount of oxidation of wool grease secreted immediately after shearing. To identify components of wool grease that might act as a carrier to facilitate lateral diffusion of topically applied insecticides. DESIGN: Fine-wool Merino sheep were shorn and residual greasy wool was collected from the sheep's flank. The quantity of grease produced, and the amount of oxidation was measured during 18 days after shearing. Wool grease was fractionated into five component groups based on their polarity and the degree of oxidation in these fractions determined. RESULTS: There was a 24% increase in grease production within 2 days after shearing but secretions returned to pre-shearing amounts after 4 days. During this period wool grease oxidized rapidly. Of the grease fractions examined, sterol and wax esters remained essentially unoxidized whereas free sterols such as cholesterol and lanosterol, fatty acids and polar lipids, aldehydes and alcohols were extensively oxidized within 7 days after shearing. CONCLUSION: The transient increase in grease production after shearing may facilitate diffusion of topically applied synthetic pyrethroid insecticides. Oxidation of grease components may then contain the insecticide and limit further diffusion. Incorporating the insecticide in non-oxidising fractions of wool grease may make insecticide dispersion more efficient. 相似文献
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The literature mostly indicates that docking fat-tailed lambs initially reduces growth but that post-weaning growth and feed
conversion efficiency then increase. The amount of fat deposited, the total separable lean meat to fat ratio and the meat
quality all increase, while the percentage of bone in the carcase either decreases or does not change in the carcases of the
docked lambs. Wool growth and characteristics are, in general, not affected and reproductive traits in ewes and lambs are
improved by docking. The rectal temperature, respiration rate and pulse rate are decreased following docking. The concentrations
of immunoreactive beta-endorphin and cortisol in the plasma and the incidence of foot stamping and restlessness, as indicators
of stress, increase after docking. Other constituents of the blood are not significantly altered following docking or by the
methods of docking. Docking of fat-tailed sheep using rubber rings at one day of age can be recommended.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献