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https://www.readbyqxmd.com/read/29164710/expression-profiles-of-immunity-and-reproductive-genes-during-transition-period-in-holstein-cattle
#1
A I Ateya, M S Hussein, H M Ghanem, R M Saleh, W B El-Domany, Y Y Elseady
The transition period is a critical time for dairy cows as the animal is subjected to the physiological stress accompanying parturition. Immunosuppression and health status were examined during this period in 80 Holstein cows. Blood samples were taken from each cow 3, 2 and 1 week before and after calving, and at calving (0 day). RNA was extracted and subjected to real-time PCR to determine mRNA levels for the immune-related genes TLR 2, 4, 6, 7 and β-defensin 5 in addition to the reproduction-related genes prolactin and IGF-I...
November 21, 2017: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/29164137/urban-livestock-keeping-in-the-city-of-nairobi-diversity-of-production-systems-supply-chains-and-their-disease-management-and-risks
#2
Pablo Alarcon, Eric M Fèvre, Patrick Muinde, Maurice K Murungi, Stella Kiambi, James Akoko, Jonathan Rushton
Urban livestock keeping in developing cities have an important role in food security and livelihoods but can also pose a significant threat to the environment and health of urban dwellers. The aim of this study was to identify the different livestock systems in Nairobi, their supply chains, and their management and food safety risks. Seven focus group discussions with livestock production officers in charge of each major Nairobi sub-county were conducted. Data were collected on the type of systems existing for each livestock species and their supply chains, disease management, food safety risks, and general husbandry and gender factors...
2017: Frontiers in Veterinary Science
https://www.readbyqxmd.com/read/29158993/antimicrobial-consumption-on-austrian-dairy-farms-an-observational-study-of-udder-disease-treatments-based-on-veterinary-medication-records
#3
Clair L Firth, Annemarie Käsbohrer, Corina Schleicher, Klemens Fuchs, Christa Egger-Danner, Martin Mayerhofer, Hermann Schobesberger, Josef Köfer, Walter Obritzhauser
Background: Antimicrobial use in livestock production is an important contemporary issue, which is of public interest worldwide. Antimicrobials are not freely available to Austrian farmers and can only be administered to livestock by veterinarians, or by farmers who are trained members of the Animal Health Service. Since 2015, veterinarians have been required by law to report antimicrobials dispensed to farmers for use in food-producing animals. The study presented here went further than the statutory framework, and collected data on antimicrobials dispensed to farmers and those administered by veterinarians...
2017: PeerJ
https://www.readbyqxmd.com/read/29157366/culling-from-the-actors-perspectives-decision-making-criteria-for-culling-in-qu%C3%A3-bec-dairy-herds-enrolled-in-a-veterinary-preventive-medicine-program
#4
Denis Haine, Roger Cue, Asheber Sewalem, Kevin Wade, René Lacroix, Daniel Lefebvre, Jonathan Rushton, Julie Arsenault, Émile Bouchard, Jocelyn Dubuc
The series of events leading to the decision to cull a cow is complex, involving both individual-level and herd-level factors. While the decision is guided by financial returns, it is also influenced by social and psychological factors. Research studies on the motivational and behavioural aspects of farmers' decision utility are sparse, and nonexistent regarding culling expectations and its decision process. Our goal was to identify shared criteria on culling decisions held by dairy producers and farm advisers, with the help of the Q-methodology...
December 1, 2017: Preventive Veterinary Medicine
https://www.readbyqxmd.com/read/29157144/personal-exposure-of-dairy-workers-to-dust-endotoxin-muramic-acid-ergosterol-and-ammonia-on-large-scale-dairies-in-the-high-plains-western-united-states
#5
Margaret E Davidson, Joshua Schaeffer, Maggie L Clark, Sheryl Magzamen, Elizabeth J Brooks, Thomas J Keefe, Mary Bradford, Noa Roman-Muniz, John Mehaffy, Gregory Dooley, Jill A Poole, Frank M Mitloehner, Sue Reed, Marc B Schenker, Stephen J Reynolds
Dairy workers experience a high degree of bioaerosol exposure, composed of an array of biological and chemical constituents, which have been tied to adverse health effects. A better understanding of the variation in the magnitude and composition of exposures by task is needed to inform worker protection strategies. To characterize the levels and types of exposures, 115 dairy workers grouped into three task categories on nine farms in the high plains western United States underwent personal monitoring for inhalable dust, endotoxin, 3-hydroxy fatty acids (3-OHFA), muramic acid, ergosterol, and ammonia over one work shift...
November 20, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/29154738/validation-of-a-pedometer-algorithm-as-a-tool-for-evaluation-of-locomotor-behaviour-in-dairy-mediterranean-buffalo
#6
Luigi D'Andrea, Jacopo Guccione, Maher Alsaaod, Ramona Deiss, Antonio Di Loria, Adrian Steiner, Paolo Ciaramella
This research communication validates an algorithm to monitor natural occurrence of locomotor behaviours in dairy Mediterranean buffalo based on the output of a 3-dimensional accelerometer (RumiWatch®, pedometer). Several characteristics of the locomotor behaviour were detected with a very high (up-right, lying and standing time) or high degree of correlation (walking time and number of strides) and a low mean difference with the video recording. The proportion of correctly detected events exceeded 99 % for the following variables: stand up and lie down events, as well as number of lying, standing or walking bouts...
November 2017: Journal of Dairy Research
https://www.readbyqxmd.com/read/29153530/physicochemical-and-sensory-properties-of-yogurts-containing-sacha-inchi-plukenetia-volubilis-l-seeds-and-%C3%AE-glucans-from-ganoderma-lucidum
#7
Ana-Milena Vanegas-Azuero, Luis-Felipe Gutiérrez
Dairy products have been widely used for adding various biomolecules with the aim of improving their functional properties and health benefits. In this study, the physicochemical properties and sensory acceptance of yogurts enriched with sacha inchi (Plukenetia volubilis) seeds (SIS) and β-glucans from Ganoderma lucidum (BGGL) were investigated. The angiotensin-converting enzyme-inhibitory activity of some yogurt samples was also evaluated. Yogurts were produced from reconstituted skim milk powder, and SIS (4% wt/wt) and BGGL were added at different concentrations (0-1...
November 15, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/29153521/efficacy-of-colostrum-replacer-versus-maternal-colostrum-on-immunological-status-health-and-growth-of-preweaned-dairy-calves
#8
A Lago, M Socha, A Geiger, D Cook, N Silva-Del-Río, C Blanc, R Quesnell, C Leonardi
Commercially available colostrum replacers (CR) are commonly used when maternal colostrum (MC) is unavailable, for managerial convenience, to ensure quality consistency at first feeding, or in disease control and eradication programs. The objective of this study was to determine the efficacy of feeding First Day Formula (Accelerated Genetics, Baraboo, WI) CR versus pooled MC on immunological status, growth, and health of preweaned dairy calves. A total of 1,220 Jersey and Jersey × Holstein calves born on a California Central Valley dairy farm were assigned after birth to receive either CR or MC following a systematic allocation procedure...
November 15, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/29153520/retrospective-analysis-of-austrian-health-recording-data-of-antibiotic-or-nonantibiotic-dry-off-treatment-on-milk-yield-somatic-cell-count-and-frequency-of-mastitis-in-subsequent-lactation
#9
T Wittek, A Tichy, B Grassauer, C Egger-Danner
Typically, dairy cows are dried off at the end of lactation. During the dry period, intramammary infections may be cured or persist, and new infections may occur. Traditionally, antibiotics (AB) have been used at dry-off. However, blanket antibiotic dry-off treatment may no longer be justifiable and, recently, selective use of antibiotics at dry off has been proposed and different decision criteria suggested. The objective of the study was to evaluate cows receiving antibiotic treatment at dry off (AB group) compared with cows dried off without antibiotics (non-AB group) using a large data set...
November 15, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/29153519/invited-review-practical-feeding-management-recommendations-to-mitigate-the-risk-of-subacute-ruminal-acidosis-in-dairy-cattle
#10
E Humer, R M Petri, J R Aschenbach, B J Bradford, G B Penner, M Tafaj, K-H Südekum, Q Zebeli
Rumen health is of vital importance in ensuring healthy and efficient dairy cattle production. Current feeding programs for cattle recommend concentrate-rich diets to meet the high nutritional needs of cows during lactation and enhance cost-efficiency. These diets, however, can impair rumen health. The term "subacute ruminal acidosis" (SARA) is often used as a synonym for poor rumen health. In this review, we first describe the physiological demands of cattle for dietary physically effective fiber. We also provide background information on the importance of enhancing salivary secretions and short-chain fatty acid absorption across the stratified squamous epithelium of the rumen; thus, preventing the disruption of the ruminal acid-base balance, a process that paves the way for acidification of the rumen...
November 15, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/29153512/dose-and-type-dependent-effects-of-long-chain-fatty-acids-on-adipogenesis-and-lipogenesis-of-bovine-adipocytes
#11
Chen Yanting, Q Y Yang, G L Ma, M Du, J H Harrison, E Block
Differentiation and lipid metabolism of adipocytes have a great influence on milk performance, health, and feed efficiency of dairy cows. The effects of dietary long-chain fatty acids (FA) on adipogenesis and lipogenesis of dairy cows are often confounded by other nutritional and physiological factors in vivo. Therefore, this study used an in vitro approach to study the effect of dose and type of long-chain FA on adipogenesis and lipogenesis of bovine adipocytes. Stromal vascular cells were isolated from adipose tissue of dairy cows and induced into mature adipocytes in the presence of various long-chain FA including myristic, palmitic, stearic, oleic, or linoleic acid...
November 15, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/29153184/a-100-year-review-yogurt-and-other-cultured-dairy-products
#12
Kayanush J Aryana, Douglas W Olson
The history of the last 100 years of the science and technology of yogurt, sour cream, cultured butter, cultured buttermilk, kefir, and acidophilus milk has been one of continuous development and improvement. Yogurt leads the cultured dairy product category in terms of volume of production in the United States and recent research activity. Legal definitions of yogurt, sour cream and acidified sour cream, and cultured milk, including cultured buttermilk, are presented in the United States Code of Federal Regulations and summarized here...
December 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/29153181/a-100-year-review-microbiology-and-safety-of-milk-handling
#13
Kathryn J Boor, Martin Wiedmann, Sarah Murphy, Sam Alcaine
Microbes that may be present in milk can include pathogens, spoilage organisms, organisms that may be conditionally beneficial (e.g., lactic acid bacteria), and those that have not been linked to either beneficial or detrimental effects on product quality or human health. Although milk can contain a full range of organisms classified as microbes (i.e., bacteria, viruses, fungi, and protozoans), with few exceptions (e.g., phages that affect fermentations, fungal spoilage organisms, and, to a lesser extent, the protozoan pathogens Cryptosporidium and Giardia) dairy microbiology to date has focused predominantly on bacteria...
December 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/29153180/a-100-year-review-progress-on-the-chemistry-of-milk-and-its-components
#14
John A Lucey, Don Otter, David S Horne
Understanding the chemistry of milk and its components is critical to the production of consistent, high-quality dairy products as well as the development of new dairy ingredients. Over the past 100 yr we have gone from believing that milk has only 3 protein fractions to identifying all the major and minor types of milk proteins as well as discovering that they have genetic variants. The structure and physical properties of most of the milk proteins have been extensively studied. The structure of the casein micelle has been the subject of many studies, and the initial views on submicelles have given way to the current model of the micelle as being assembled as a result of the concerted action of several types of interactions (including hydrophobic and the formation of calcium phosphate nanoclusters)...
December 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/29153174/a-100-year-review-animal-welfare-in-the-journal-of-dairy-science-the-first-100-years
#15
Marina A G von Keyserlingk, Daniel M Weary
This paper outlines the history and development of research in the area of animal welfare as reflected in the 100 yr that the Journal of Dairy Science has been published. The first paper using the term "animal welfare" was published in 1983; since then (to May 2017), 244 papers that reflect growing interest regarding how farm animals are cared for have been published. Much of the scientific work to date has focused on issues related to cow health, such as lameness, and methodologically many papers use behavioral measures...
December 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/29153173/a-100-year-review-lactating-dairy-cattle-housing-management
#16
J M Bewley, L M Robertson, E A Eckelkamp
Since the mid-1800s, farmers have been housing livestock. What began as a part-time solution for cold winters, stormy days, or injured animals has evolved into the main or only area in which cows spend their adult lives. With this change, farmers, academic researchers, and industry innovators have shaped the farm landscape, literally. Over the last 100 years, changes have been made for productivity, health, milk quality, reproduction, animal well-being, and farm profitability. We review a snapshot of those changes and look ahead to the future of lactating dairy cattle housing...
December 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/29153172/a-100-year-review-metabolic-health-indicators-and-management-of-dairy-cattle
#17
T R Overton, J A A McArt, D V Nydam
Our aim in this Journal of Dairy Science centennial review is to describe the evolution of focus on metabolic indicators, from discovery and description to evaluation at the individual cow and subsequently herd levels, over the past 100 yr. Furthermore, we discuss current and future technologies that will be used in the dairy industry to utilize these indicators widely going forward. Knowledge of chemical changes in various fluids (e.g., blood, urine, and milk) accompanying numerous metabolic disease states in the dairy cow has existed since almost the beginning of the Journal of Dairy Science 100 yr ago...
December 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/29153166/a-100-year-review-practical-female-reproductive-management
#18
J S Stevenson, J H Britt
Basic knowledge of mechanisms controlling reproductive processes in mammals was limited in the early 20th century. Discoveries of physiologic processes and mechanisms made early in the last century laid the foundation to develop technologies and programs used today to manage and control reproduction in dairy cattle. Beyond advances made in understanding of gonadotropic support and control of ovarian and uterine functions in basic reproductive biology, advancements made in artificial insemination (AI) and genetics facilitated rapid genetic progress of economically important traits in dairy cattle...
December 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/29153165/a-100-year-review-historical-development-of-female-reproductive-physiology-in-dairy-cattle
#19
William W Thatcher
The objective of this historical review in female reproductive physiology is to encapsulate major advancements since the founding of the American Dairy Science Association in 1906. The emphasis is on landmark publications in the Journal of Dairy Science since its first volume in 1917. A historical perspective and inferences are made in forecasting evolution of female reproduction and links between physiology of reproduction and the mammary gland. Subsequent sections are focused into main physiological categories and the temporal advancements within these physiological windows...
December 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/29153164/a-100-year-review-identification-and-genetic-selection-of-economically-important-traits-in-dairy-cattle
#20
Filippo Miglior, Allison Fleming, Francesca Malchiodi, Luiz F Brito, Pauline Martin, Christine F Baes
Over the past 100 yr, the range of traits considered for genetic selection in dairy cattle populations has progressed to meet the demands of both industry and society. At the turn of the 20th century, dairy farmers were interested in increasing milk production; however, a systematic strategy for selection was not available. Organized milk performance recording took shape, followed quickly by conformation scoring. Methodological advances in both genetic theory and statistics around the middle of the century, together with technological innovations in computing, paved the way for powerful multitrait analyses...
December 2017: Journal of Dairy Science
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