Xin Gen Lei, Jeremy D. Weaver, Edward J. Mullaney, Abul H. J. Ullah, M. J. Azain
Phytases are phosphohydrolytic enzymes that initiate stepwise removal of
phosphate from phytate. Simple-stomached species such as swine, poultry, and
fish require extrinsic phytase to digest phytate, the major form of phosphorus
in plant-based feeds. Consequently, this enzyme is supplemented in these
species’ diets to decrease their phosphorus excretion, and it has emerged as one
of the most effec... hiện toàn bộ
Sung Woo Kim, John F. Less, Li Wang, T. Yan, Viswanath Kiron, Sadasivam Kaushik, Xin Gen Lei
Feed protein supplements are one of the most expensive and limiting feed
ingredients. This review offers a comprehensive analysis of how the expected
expansion of animal production, driven by the rising world population and living
standards for more animal-sourced foods, is creating a global shortage of feed
protein supply. Because ruminants, chickens, and pigs contribute to 96% of the
global supp... hiện toàn bộ
Statistical methodology has played a key role in scientific animal breeding.
Approximately one hundred years of statistical developments in animal breeding
are reviewed. Some of the scientific foundations of the field are discussed, and
many milestones are examined from historical and critical perspectives. The
review concludes with a discussion of some future challenges and opportunities
arising ... hiện toàn bộ
Hong Li, Cristina W. Cunha, Naomi S. Taus, Donald P. Knowles
Malignant catarrhal fever (MCF) is an often lethal infection of many species in
the order Artiodactyla. It is caused by members of the MCF virus group within
Gammaherpesvirinae. MCF is a worldwide problem and has a significant economic
impact on highly disease-susceptible hosts, such as cattle, bison, and deer.
Several epidemiologic forms of MCF, defined by the reservoir ruminant species
from whic... hiện toàn bộ
Bovine leukemia virus (BLV) and human T-lymphotrophic virus type-1 (HTLV-1) are
related retroviruses associated with persistent and lifelong infections and a
low incidence of lymphomas within their hosts. Both viruses can be spread
through contact with bodily fluids containing infected cells, most often from
mother to offspring through breast milk. Each of these complex retroviruses
contains typic... hiện toàn bộ