提升犊牛日增重的方法研究     

吴赫云  解玲娜  郑玺 《中国乳业》2021,(8):52-55

犊牛阶段的生长状况对牛只的生产性能具有重要影响,为提高牧场效益,牧场越来越追求犊牛阶段生长的最大化。通过饲喂代乳粉达到犊牛断奶前1.0 kg日增重,对牛只生产性能的提升具有重要意义。本文主要介绍增加犊牛日增重对牛只生产性能的积极影响,同时根据荷兰Schils的试验对代乳粉的选择和饲喂流程提出建议,以期对牧场合理使用代乳粉,实现犊牛阶段生长最大化提供参考。  相似文献   

Soil aggregate formation and stability induced by starch and cellulose     

《Soil biology & biochemistry》2015

Soil aggregate (SA) can be formed and stabilized when soil organic matter (SOM) is decomposed in the soil. However, the relationships between the SA dynamics and SOM with different decomposition rates have not been clarified. Therefore, this study examined the effects of the addition of polysaccharides to soil on SA formation and stability. A Japanese tropical soil was incubated for 99 d at 30 °C in a dark environment following the addition of 0.5% (w/w) starch or cellulose. The decomposition rates of the amendments, and SA formation and stability were evaluated by measuring soil respiration rates, and distribution fractions of soil aggregate sizes and mean weight diameter (MWD) of SA, respectively. The cumulative soil respirations with all treatments rapidly increased until Day 12 of the incubation. The initial slope of the cumulative soil respiration in the soil with starch was significantly higher than that in the soil with cellulose. In either soil with starch or cellulose, the fractions of macro-aggregates (>1000 μm in diameter) significantly increased, respectively, compared with control soil. However, the fractions of meso-aggregates (250–1000 μm) and nano-aggregate (<20 μm) in the soil with starch significantly decreased, while those fractions in the soil with cellulose fluctuated until Day 6. The MWDs reached the maximum on Day 6, indicating the SA formation in the soils with starch or cellulose. The increasing rate of the SA formation in the starch-amended soil was greatly higher than that in the cellulose-amended soil. After Day 6, the MWDs in the soils with either polysaccharide decreased with similar trends with no significant differences between treatments, indicating similar stability of the SA in both treatments. This study showed that the different decomposability of the organic amendments might influence the SA formation differently, but not the SA stability.  相似文献   

Environmental heat and airborne pollen concentration are associated with increased asthma severity in horses          下载免费PDF全文

M. Bullone  R. Y. Murcia  J‐P. Lavoie 《Equine veterinary journal》2016,48(4):479-484

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国内外致泻大肠埃希氏菌O157:H7的检测标准比较及建议     

孟静  钟立霞  郭颖慧  程祥龙  伊廷存  霍胜楠 《中国乳业》2023,(4):76-81

致泻大肠埃希氏菌O157:H7（STEC O157:H7）是大肠埃希氏菌中致病性最严重的一种食源性致病菌,主要存在于牛肉、牛奶、水果及其制品中,对身体健康造成很大危害,甚至引发死亡。食品中STEC O157:H7检测尤为重要。本文对国内外STEC O157:H7的检测标准进行比较,提出我国标准在样品前处理、快速筛选方法的应用等方面需要加强,以便为该菌快速准确检测提供帮助,实现与国际标准化体系建设接轨,满足实验室检测需要。  相似文献   

Antioxidant,anti-amylase and anti-glycation potential of brans of some Sri Lankan traditional and improved rice (Oryza sativa L.) varieties     

《Journal of Cereal Science》2014,59(3):451-456

Brans of 23 traditional and 12 improved (both red and white) rice varieties in Sri Lanka were screened for anti-amylase and anti-glycation activities in vitro. Varieties which showed the highest inhibitory activities at screening were further investigated for anti-glucosidase and glycation reversing as anti-diabetic properties. The same varieties were studied for selected antioxidant properties. Significantly high anti-amylase and anti-glycation activities were observed for bran extracts of red varieties compared to white varieties at screening. Traditional red rice varieties, Masuran, Sudu Heeneti, Dik Wee and Goda Heeneti, exhibited significant and dose dependent anti-amylase, anti-glycation and glycation reversing activities. These varieties also showed marked antioxidant properties. It is concluded that brans of Sri Lankan traditional red rice varieties Masuran, Sudu Heeneti, Dik Wee and Goda Heeneti may be potential food supplements for diabetes.  相似文献   

Unique Property Continuation and Compact Imbodding and Nonlinear Elliptic Equations     

He Chuanjiang 《保鲜与加工》1996,(1):136-138

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Experiment of Two-phase Flow Patterns and Analysis of Flow Map During Condesation inside Horizontal Two Dimensional Internal Microfin Tubes     

Du Yang  Xin Mingdao 《保鲜与加工》1996,(2):41-47

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Multiple Layer BP Neural Network for Fuzzy Calculating     

Zou Xiaoji  Zang Anbang  Zou Jiaqi 《保鲜与加工》1996,(3):57-60

The FCBP(Fuzzy calculating BP) algorithm which is proposed by this paper hasovercome the sensitivity for samples,reduced the number of input layer's samples,lightened the burden of input layer.it is suitable to fuzzy inference and pattern recognition.  相似文献   

Detection of Edges within the Cross Sectionfrom Projections of Parallel Beams Via the Wavelet Method     

Zeng Li  Yi Dong  Chen Tinghuai 《保鲜与加工》1996,(6):85-89

The wavelet analysis are used in the detection of edges within the cross sectionfrom projections of parallel beams. This method can be applied in computerized tomography (CT) inorder to reduce the noise and the number of projections.  相似文献   

Minimal Periodic Solutions of SuperquadraticFirst Order Convex Hamiltonian Systems     

Zhang Shiqing 《保鲜与加工》1996,(6):96-103

This paper generalizes all known results on Rabinowitz's minimal periodic solution conjecture under the assumption that Hamiltonian function is C2 strictly convex.  相似文献