نتایج جستجو برای: dairy cow
تعداد نتایج: 54914 فیلتر نتایج به سال:
The objective of this study was to evaluate the effect of a rumen-protected niacin product (NiaShure, Balchem Corp., New Hampton, NY) on lactation performance by dairy cows during the summer in Wisconsin. Eighty lactating dairy cows (63 ± 29 DIM) were used in a 10-wk lactation trial (a 2-wk pretreatment covariate period followed by an 8-wk treatment period). Cows were stratified by breed, parit...
A web-based multi-models expert system called DCDDS is presented in this paper, which developed for diagnosis of dairy cow diseases through the symptoms submitted by users on web. As it is accepted that the inference engine and the relevant knowledge representation are the crucial part of diagnosis expert system, which limits its application and popularization in animal disease diagnosis. To br...
It is well documented that global warming is unequivocal. Dairy production systems are considered as important sources of greenhouse gas emissions; however, little is known about the sensitivity and vulnerability of these production systems themselves to climate warming. This review brings different aspects of dairy cow production in Central Europe into focus, with a holistic approach to emphas...
The tracer gas ratio method, using CO2 as natural tracer, has been suggested as a pragmatic option to measure emissions from naturally ventilated (NV) barns without the need to directly estimate the ventilation rate. The aim of this research was to assess the performance of a low-cost Non-Dispersive Infra-Red (NDIR) sensor for intensive spatial field monitoring of CO2 concentrations in a NV dai...
licensed dairy farms in the central region of Fars province were randomly selected in order to participate in aseasonal prevalence study. A cross-sectional study was designed to determine prevalence at cow and quarterlevel based on clinical signs for clinical mastitis and indirect tests for subclinical mastitis. 6180 quarters from1545 dairy cows were tested by clinical examination and Californi...
The promotion of livestock production is widely believed to support enhanced diet quality and child nutrition, but the empirical evidence for this causal linkage remains narrow and ambiguous. This study examines whether adoption of improved dairy cow breeds is linked to farm-level outcomes that translate into household-level benefits including improved child nutrition outcomes in Uganda. Using ...
Early behavior work with dairy cattle focused on the agonistic interactions and dominance structure. This current behavior project focused on determining social preferences rather than dominance. Two lots of 130 Holstein cows at the Andrews University Dairy were observed 8 nights over the course of 6 weeks. Data was collected in the evening after milking and feeding to allow the cattle time to ...
Farmers and researchers are interested in improving cow welfare in the dairy industry. One area of research involves use of automatic milking systems (AMS) on farms. These robotic systems have been shown to be effective in decreasing the prevalence of lameness in the herd (Leach et al., 2012) and decreasing cow stress (Dijkstra et al., 2012). According to Jacobs & Siegford (2012), cow wellbeing...
MicroRNAs (miRNAs) are a class of small non-coding, endogenous regulatory RNAs that function by controlling gene expression at the post-transcriptional level. Using small RNA sequencing and qRT-PCR techniques, we found that the expression of miR-152 was significantly increased during lactation in the mammary glands of dairy cows producing high quality milk compared with that in cows producing l...
The aim of this study was to gain a deeper understanding of work-related physical and psychosocial exposure and health symptoms of farm staff working in indoor loose-housing dairy systems in Sweden, and to examine possible associations between exposure and health symptoms of farm staff and disease incidence in their dairy herds. A sample of 41 farm owners or managers and 20 directly employed fa...
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