共查询到20条相似文献，搜索用时 796 毫秒
1.
本实验旨在探讨绍兴鸭剩余采食量(RFI)与生产性能及蛋品质之间的关系。测定300只绍兴鸭410~470日龄的采食量、体重、平均蛋重、蛋品质,计算出剩余采食量与料蛋比,并分析剩余采食量与生产性能及蛋品质的相关性。结果显示:绍兴鸭平均采食量、平均蛋重、体重、体增重、料蛋比、剩余采食量分别为198.8 g/d、73.0 g、1500.9 g、2.5 g/d、2.7、3.5 g/d;低剩余采食量组的剩余采食量、采食量以及料蛋比极显著低于高剩余采食量组;相关性分析表明,剩余采食量与采食量和料蛋比呈极显著正相关(P<0.01);采食量与平均蛋重、体重呈极显著正相关(P<0.01),与料蛋比呈极显著负相关(P<0.01),与体增重呈显著正相关性(P<0.05);蛋品质分析结果表明,高剩余采食量组仅蛋黄色泽水平显著高于低剩余采食量组;相关性分析表明,剩余采食量与蛋品质各指标间均无显著相关性。本试验结果表明,以剩余采食量为蛋鸭选育指标是可行的,且选育低剩余采食量的鸭子能显著降低采食量,提高饲料效率,且不改变产蛋重及蛋品质。 相似文献
2.
3.
研究利用全自动饲料消耗测定系统记录了111只北京鸭21~42日龄的采食时间、采食次数及采食量并进行统计分析得出其采食规律。结果表明:鸭群进入不同位置测定站的次数有显著差异。肉鸭基本全天采食,在4∶00以后采食次数开始增加,至6∶00~8∶00达到全天采食高峰,16∶00~18∶00达到全天第二个采食高峰,18∶00~20∶00是全天采食次数最少的时段。剩余采食量呈正态分布,表明在现有群体中改良饲料转化效率有很大空间。剩余采食量与饲料转化率呈中度相关(R=0.52)。研究发现采食量是影响剩余采食量的重要因素。 相似文献
4.
5.
6.
生猪企业一直高度关注饲料效率问题,尤其是在低利润率和高饲料成本的阶段.Nick Boddicker,Nicholas K Gabler,Michael E Spurlock,Dan Nettleton和Jack C M Dekkers介绍,剩余采食量(RFI)是一种计算饲料利用率的方法,即根据猪的增质量和背膘,计算实际采食量与预计采食量之差. 相似文献
7.
8.
为揭示秦川牛的生长发育规律,选择30头成年秦川牛进行主要体尺、体重和剩余采食量统计分析,选择累计贡献率达81.06%的5个主成分进行分析。结果显示:秦川牛之间采食量差异不显著(P0.05),其中剩余采食量、胸深和胸围变异幅度较大,选育潜力大;体重与体高、平均日增重呈极显著正相关(P0.01),体高、腹围与平均日增重呈极显著正相关(P0.01),剩余采食量与采食量呈极显著正相关(P0.01);从主成分的特征值与累计贡献率来看,第1主成分反映体型外貌特征,第2主成分主要反映后驱特征,第3主成分主要反映采食特征。本研究为阐明秦川牛体尺体重和剩余采食量之间的关系,为秦川牛的选种选育提供参考依据。 相似文献
9.
《中国家禽》2016,(1)
以优质矮小型黄羽肉鸡作为研究材料,结合采食量自动测定设备记录的采食量和体重数据,对30个家系的1 158个个体的饲料利用效率相关性状进行遗传力估计,并分析其与生长性状、部分屠体性状的相关关系。结果表明,44~83日龄剩余采食量的遗传力为0.35,44~83日龄饲料转化比的遗传力为0.22,两者呈显著的表型和遗传相关(r_p=0.66,r_g=0.75)。对两者进行选择会对生长性状和部分屠体性状带来不同程度的间接选择反应。饲料转化比与日均采食量的遗传相关为0.44,剩余采食量与日均采食量的遗传相关程度更高,为0.75。如果单纯从降低采食量的角度考虑,选择低剩余采食量比选择低料重比的效果可能会更好。 相似文献
10.
11.
12.
13.
本文介绍了我国奶牛饲料业基本情况,提出了主要存在的饲料生产与奶牛饲养模式不相适应的问题,着重提出了“饲料配合”建设的意义,内容及可操作性,提出了当前发展我国奶牛业的策略。 相似文献
14.
在分析青海省畜牧业，特别是养猪业生产的基础上，结合全国预混料生产情况，指出当前发展青海省预混料生产现有技术和市场基础，应引起有关部门和生产厂家重视。 相似文献
15.
本文论述了青海省的饲料工业现状，饲料供需现状及饲料开发应用前景。指出，首先要注重浓缩料和预混料的研制与生产，其次要合理利用优势资源如菜籽饼粕等，此外还要加强和改善饲料工业行业管理，建立健全质量保证体系；深化体制改革；加大饲料工业科研投入；建立区域性的饲料综合市场等。 相似文献
16.
17.
18.
《The Journal of Applied Poultry Research》2006,15(4):564-573
Mash feed preparation is the widely practiced method of preparing and presenting feed to laying hens in the egg industry due to its economics, flexibility, and simplicity. However, this form of feed presents a wide range of particle sizes that are likely to segregate (i.e., large particles may separate from the small particles during feed delivery through either auger or drag-chain delivery systems). Two predominant segregation patterns were observed, including sieving and side-to-side segregation, during feed delivery. These segregation patterns promoted ingredient selection activities by the hens (mainly larger particles) that modified the nutrients in the feed and influenced the hens’ ability to meet their daily nutrient requirements. This observation was quantified through a systematic study of the relationship of feed nutrients, feed particle size distribution, and hen performance, including BW and egg quality analysis. To minimize the feed segregation effect on hen performance and egg quality, 3 recommendations are proposed to improve feed fabrication and the feed delivery system. 相似文献
19.
20.
Jie Liu Ming Qi Yakuan Huang Jiao Guo Jiacai Zhang Chong Li Niya Zhang Lvhui Sun Desheng Qi 《Animal Science Journal》2017,88(8):1075-1081
This study was performed to determine the effects of oils on feed mildew and feed quality. Under different moisture content conditions (10%, 13% and 16%), the basal feeds were supplemented with 4%, 6%, 8%, 10% and 12% soybean oil. In addition, at different moisture content levels (10%, 13% and 16%), the basal feed was supplemented with 12% of various types of oil (soybean, peanut, corn and fish). Subsequently, a mixed mold spore suspension was added. The feed samples were incubated at 28°C, and the total mold, water activity (Aw), moisture, acid value, crude protein (CP), crude lipid (CL), crude ash (CA) and nitrogen‐free extract (NFE) levels were determined at 15, 30, 45 and 60 days. The results showed no significant variations in the feed moisture, CP, CL, CA and NEF contents. However, the acid value gradually increased in the feed samples with an extended incubation time and increasing initial moisture. The feed moisture content was a critical factor controlling feed mildew, and high levels of oil supplementation caused an elevated Aw. Additionally, peanut oil promoted mold growth in feed. These results provide a reference for the production and scientific management of formulated feed. 相似文献