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https://www.readbyqxmd.com/read/27917542/genomic-evaluation-of-regional-dairy-cattle-breeds-in-single-breed-and-multibreed-contexts
#1
D Jónás, V Ducrocq, S Fritz, A Baur, M-P Sanchez, P Croiseau
An important prerequisite for high prediction accuracy in genomic prediction is the availability of a large training population, which allows accurate marker effect estimation. This requirement is not fulfilled in case of regional breeds with a limited number of breeding animals. We assessed the efficiency of the current French routine genomic evaluation procedure in four regional breeds (Abondance, Tarentaise, French Simmental and Vosgienne) as well as the potential benefits when the training populations consisting of males and females of these breeds are merged to form a multibreed training population...
December 4, 2016: Journal of Animal Breeding and Genetics, Zeitschrift Für Tierzüchtung und Züchtungsbiologie
https://www.readbyqxmd.com/read/27917170/isolation-and-characterization-of-acinetobacter-baumannii-recovered-from-campylobacter-selective-medium
#2
Dinesh M Fernando, Izhar U H Khan, Rakesh Patidar, David R Lapen, Guylaine Talbot, Edward Topp, Ayush Kumar
Acinetobacter baumannii, a Gram-negative opportunistic pathogen, is known to cause multidrug resistant infections. This organism has primarily been isolated from clinical environments and its environmental reservoirs remain largely unknown. In the present study, we recovered seven isolates of A. baumannii growing under conditions selective for Campylobacter spp. (microaerophilic at 42°C and in the presence of antibiotics) from dairy cattle manure storage tank or surface water impacted by livestock effluents...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27917164/longitudinal-study-of-two-irish-dairy-herds-low-numbers-of-shiga-toxin-producing-escherichia-coli-o157-and-o26-super-shedders-identified
#3
Brenda P Murphy, Evonne McCabe, Mary Murphy, James F Buckley, Dan Crowley, Séamus Fanning, Geraldine Duffy
A 12-month longitudinal study was undertaken on two dairy herds to ascertain the Shiga-toxin producing Escherichia coli (STEC) O157 and O26 shedding status of the animals and its impact (if any) on raw milk. Cattle are a recognized reservoir for these organisms with associated public health and environmental implications. Animals shedding E. coli O157 at >10,000 CFU/g of feces have been deemed super-shedders. There is a gap in the knowledge regarding super-shedding of other STEC serogroups. A cohort of 40 lactating cows from herds previously identified as positive for STEC in a national surveillance project were sampled every second month between August, 2013 and July, 2014...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27915439/presence-of-ureaplasma-diversum-in-the-genital-tracts-of-female-dairy-cattle-in-mato-grosso-state-brazil
#4
Jaqueline B Azevedo, Gustavo S Silva, Priscylla S Rocha, Letícia C Pitchenin, Valéria Dutra, Luciano Nakazato, Anderson Castro Soares de Oliveira, Caroline A Pescador
Ureaplasma diversum infection in bovine females may result in various reproductive problems, including granular vulvovaginitis, abortion, weak calves, salpingitis, and spontaneous abortion. The presence of U. diversum in a dairy bovine population from midwestern Brazil has not been established. The aim of this study was to determine whether U. diversum was present in dairy cattle from midwestern Brazil using polymerase chain reaction (PCR). Vulvovaginal mucus was analyzed from 203 cows located in six municipalities in the north region of Mato Grosso State, Brazil...
December 3, 2016: Tropical Animal Health and Production
https://www.readbyqxmd.com/read/27914350/phosphorus-flows-in-a-peri-urban-region-with-intensive-food-production-a-case-study
#5
S Bittman, S C Sheppard, D Poon, D E Hunt
Excess phosphorus (P) in peri-urban regions is an emerging issue, whereas there is global depletion of quality mined supplies of P. The flow of P across the landscape leading to regional surpluses and deficits is not well understood. We computed a regional P budget with internal P flows in a fairly discreet peri-urban region (Lower Fraser Valley, BC) with closely juxtaposed agricultural and non-agricultural urban ecosystems, in order to clarify the relationship between food production, food consumption and other activities involving use of P (e...
November 30, 2016: Journal of Environmental Management
https://www.readbyqxmd.com/read/27907192/adaptive-test-schemes-for-control-of-paratuberculosis-in-dairy-cows
#6
Carsten Kirkeby, Kaare Græsbøll, Søren Saxmose Nielsen, Lasse Engbo Christiansen, Nils Toft, Tariq Halasa
Paratuberculosis is a chronic infection that in dairy cattle causes reduced milk yield, weight loss, and ultimately fatal diarrhea. Subclinical animals can excrete bacteria (Mycobacterium avium ssp. paratuberculosis, MAP) in feces and infect other animals. Farmers identify the infectious animals through a variety of test-strategies, but are challenged by the lack of perfect tests. Frequent testing increases the sensitivity but the costs of testing are a cause of concern for farmers. Here, we used a herd simulation model using milk ELISA tests to evaluate the epidemiological and economic consequences of continuously adapting the sampling interval in response to the estimated true prevalence in the herd...
2016: PloS One
https://www.readbyqxmd.com/read/27906983/tithonia-diversifolia-as-a-supplementary-feed-for-dairy-cows
#7
Rafael Sandin Ribeiro, Stephanie Amelia Terry, João Paulo Sacramento, Sylvia Rocha E Silveira, Cláudia Braga Pereira Bento, Elsa Fernandes da Silva, Hilário Cuquetto Mantovani, Marco Antônio Sundfeld da Gama, Luiz Gustavo Ribeiro Pereira, Thierry Ribeiro Tomich, Rogério Martins Maurício, Alexandre Vieira Chaves
The objective of this study was to examine the effects of Tithonia diversifolia as a supplementary forage on dairy cow performance and methane production. Nine lactating Holstein × Zebu dairy cows (519 ± 53.3 kg of body weight and 66 ± 13.3 d in milk) were paired by milk yield (21.3 ± 2.34 kg/d) and body weight and randomly assigned to three dietary treatments in a Latin square design with 21-d experimental periods (14 d for diet adaptation and 7 d for measurements and sample collection). The dietary treatments included the control diet consisting of fresh sugar cane plus concentrate (44:56, % of diet DM), and two treatment diets containing different levels of fresh T...
2016: PloS One
https://www.readbyqxmd.com/read/27898963/justification-for-setting-the-individual-animal-genotype-call-rate-threshold-at-eighty-five-percent
#8
D C Purfield, M McClure, D P Berry
Data quality of SNP arrays impacts the accuracy and precision of downstream data analyses. One such quality control measure often imposed is a threshold on individual animal call rate. Different call rate thresholds have been applied across studies; little is known, however, about the impact of these thresholds on the quality of the genotype data. The objective of the present study was to investigate the effect of different call rate thresholds on the integrity of the genotypes but also to quantify the contribution of different factors to the variability in animal call rate...
November 2016: Journal of Animal Science
https://www.readbyqxmd.com/read/27898942/technical-note-an-approach-to-derive-breeding-goals-from-the-preferences-of-decision-makers
#9
L Alfonso
This paper deals with the use of the Choquet integral to identify breeding objectives and construct an aggregate genotype. The Choquet integral can be interpreted as an extension of the aggregate genotype based on profit equations, substituting the vector of economic weights by a monotone function, called capacity, which allows the aggregation of traits based, for instance, on the preferences of decision makers. It allows the aggregation of traits with or without economic value, taking into account not only the importance of the breeding value of each trait but also the interaction among them...
November 2016: Journal of Animal Science
https://www.readbyqxmd.com/read/27898930/effects-of-roughage-inclusion-and-particle-size-on-performance-and-rumination-behavior-of-finishing-beef-steers
#10
W W Gentry, C P Weiss, C M Meredith, F T McCollum, N A Cole, J S Jennings
Roughage is typically mechanically processed to increase digestibility and improve handling and mixing characteristics in beef cattle finishing diets. Roughage is fed to promote ruminal health and decrease digestive upset, but inclusion in finishing diets is limited due to the cost per unit of energy. Rumination behavior may be a means to standardize roughage in beef cattle finishing diets, and increasing particle size of roughage may allow a decrease in roughage inclusion without sacrificing animal performance...
November 2016: Journal of Animal Science
https://www.readbyqxmd.com/read/27898905/opportunities-for-genomic-prediction-for-fertility-using-endocrine-and-classical-fertility-traits-in-dairy-cattle
#11
A M M Tenghe, B Berglund, E Wall, R F Veerkamp, D J de Koning
Endocrine fertility traits, defined from progesterone concentration levels in milk, have been suggested as alternative indicators for fertility in dairy cows because they are less biased by farm management decisions and more directly reflect a cow's reproductive physiology than classical traits derived from insemination and calving data. To determine the potential use of endocrine fertility traits in genomic evaluations, the improvement in accuracy from using endocrine fertility traits concurrent with classical traits in the genomic prediction of fertility was quantified...
September 2016: Journal of Animal Science
https://www.readbyqxmd.com/read/27898879/genetic-parameters-for-both-a-liver-damage-phenotype-caused-by-and-antibody-response-to-phenotype-in-dairy-and-beef-cattle
#12
A J Twomey, R G Sayers, R I Carroll, N Byrne, E O' Brien, M L Doherty, J C McClure, D A Graham, D P Berry
is a helminth parasite of economic importance to the global cattle industry, with documented high international herd prevalence. The objective of the present study was to generate the first published genetic parameter estimates for liver damage caused by as well as antibody response to in cattle. Abattoir data on the presence of live , or -damaged livers, were available between the years 2012 and 2015, inclusive. A second data set was available on cows from 68 selected dairy herds with a blood ELISA test for antibody response to in autumn 2015...
October 2016: Journal of Animal Science
https://www.readbyqxmd.com/read/27898855/genomewide-association-study-of-methane-emissions-in-angus-beef-cattle-with-validation-in-dairy-cattle
#13
C I V Manzanilla-Pech, Y De Haas, B J Hayes, R F Veerkamp, M Khansefid, K A Donoghue, P F Arthur, J E Pryce
Methane (CH) is a product of enteric fermentation in ruminants, and it represents around 17% of global CH emissions. There has been substantial effort from the livestock scientific community toward tools that can help reduce this percentage. One approach is to select for lower emitting animals. To achieve this, accurate genetic parameters and identification of the genomic basis of CH traits are required. Therefore, the objectives of this study were 1) to perform a genomewide association study to identify SNP associated with several CH traits in Angus beef cattle (1,020 animals) and validate them in a lactating Holstein population (population 1 [POP1]; 205 animals); 2) to validate significant SNP for DMI and weight at test (WT) from a second Holstein population, from a previous study (population 2 [POP2]; 903 animals), in an Angus population; and 3) to evaluate 2 different residual CH traits and determine if the genes associated with CH also control residual CH traits...
October 2016: Journal of Animal Science
https://www.readbyqxmd.com/read/27898789/nitrous-oxide-emissions-from-open-lot-cattle-feedyards-a-review
#14
Heidi M Waldrip, Richard W Todd, David B Parker, N Andy Cole, C Alan Rotz, Kenneth D Casey
Nitrous oxide (NO) emissions from concentrated animal feeding operations, including cattle feedyards, have become an important research topic. However, there are limitations to current measurement techniques, uncertainty in the magnitude of feedyard NO fluxes, and a lack of effective mitigation methods. The objective of this review was to assess NO emission from cattle feedyards, including comparison of measured and modeled emission rates, discussion of measurement methods, and evaluation of mitigation options...
November 2016: Journal of Environmental Quality
https://www.readbyqxmd.com/read/27894608/brucellosis-in-cattle-and-micro-scale-spatial-variability-of-pastoral-household-income-from-dairy-production-in-south-western-uganda
#15
Pius Mbuya Nina, Samuel Mugisha, Herwig Leirs, Gilbert Isabirye Basuta, Patrick Van Damme
Brucellosis in cattle and humans has received world-wide research attention as a neglected and re-emerging zoonotic disease with many routes of transmission. Studies of brucellosis in Uganda have emphasized occupational exposures and also revealed variations in prevalence levels by region and cattle production systems. To date, research linking pastoralist household income from dairy production to brucellosis and its transmission risk pathways do not exist in Uganda. We assessed whether spatial differences in unit milk prices can be explained by brucellosis prevalence in cattle along a distance gradient from Lake Mburo National Park in Uganda...
November 25, 2016: Acta Tropica
https://www.readbyqxmd.com/read/27894411/allele-specific-pcr-and-melting-curve-analysis-showed-relatively-high-frequency-of-%C3%AE-casein-gene-a1-allele-in-iranian-holstein-simmental-and-native-cows
#16
M Gholami, S H Hafezian, G Rahimi, A Farhadi, Z Rahimi, D Kahrizi, S Kiani, H Karim, S Vaziri, S Muhammadi, F Veisi, K Ghadiri, H Shetabi, J Zargooshi
There are two allelic forms of A1 and A2 of β-casein gene in dairy cattle. Proteolytic digestion of bovine β-casein A1 type produces bioactive peptide of β-casomorphin-7 known as milk devil. β-casomorphin-7 causes many diseases, including type 1 diabetes, cardiovascular disease syndrome, sudden death and madness. The aim of the present study was to determine the different allelic forms of β-casein gene in Iranian Holstein, Simmental and native cattle in order to identify A1 and A2 variants. The blood samples were collected randomly and DNA was extracted using modified salting out method...
October 31, 2016: Cellular and Molecular Biology
https://www.readbyqxmd.com/read/27892874/dynamics-of-the-progesterone-and-cholesterol-concentrations-within-the-bovine-corpus-luteum-cavity
#17
A Rizzo, A L Stefani, M Piccinno, M Roncetti, G D'Onghia, R L Sciorsci
The aim of this study was to examine the concentrations of progesterone (P4) and cholesterol (CHOL) in fluid of cavitary corpus luteum (CL) and in serum of dairy cattle. Cavitary corpora lutea, collected from cows at a local abattoir, were divided in four stages of development, based on days of the estrous cycle (stage I: 1-4days; stage II: 5-10days; stage III: 11-17days; stage IV: 18-20). Fluid of the their cavity was aspirated and P4 and CHOL concentrations were evaluated. The concentrations of P4 in CL cavity fluids were very high (1640-4666...
August 25, 2016: Research in Veterinary Science
https://www.readbyqxmd.com/read/27891596/in-this-issue-december-2016-chemical-immobilisation-of-free-range-cattle%C3%A2-%C3%A2-%C3%A2-dairy-cow-progesterone-assay%C3%A2-%C3%A2-%C3%A2-atypical-scrapie-in-sheep%C3%A2-%C3%A2-%C3%A2-antibiotic-resistance-in-healthy-dogs%C3%A2-%C3%A2-%C3%A2-contrast-ct-in-dermoid-sinuses%C3%A2-%C3%A2-pneumorrhachis-in-a-dog%C3%A2-%C3%A2-%C3%A2-dorsal-perineal
#18
EDITORIAL
https://www.readbyqxmd.com/read/27890338/a-longitudinal-study-on-transmission-of-staphylococcus-aureus-genotype-b-in-swiss-communal-dairy-herds
#19
Bart H P van den Borne, Hans U Graber, Verena Voelk, Carlotta Sartori, Adrian Steiner, M Christina Haerdi-Landerer, Michèle Bodmer
Staphylococcus aureus is a common mastitis causing pathogen of dairy cattle. Several S. aureus genotypes exist, of which genotype B (GTB) is highly prevalent in Swiss dairy herds. Dairy farming in mountainous regions of Switzerland is characterised by the movement of dairy cattle to communal pasture-based operations at higher altitudes. Cows from different herds of origin share pastures and milking equipment for a period of 2 to 3 months during summer. The aim of this longitudinal observational study was to quantify transmission of S...
November 18, 2016: Preventive Veterinary Medicine
https://www.readbyqxmd.com/read/27889128/genome-wide-association-study-for-lactation-persistency-female-fertility-longevity-and-lifetime-profit-index-traits-in-holstein-dairy-cattle
#20
S Nayeri, M Sargolzaei, M K Abo-Ismail, S Miller, F Schenkel, S S Moore, P Stothard
Female fertility in Holstein cattle can decline when intense genetic selection is placed on milk production. One approach to improving fertility is to identify the genomic regions and variants affecting fertility traits and then incorporate this knowledge into selection decisions. The objectives of this study were to identify or refine the positions of the genomic regions associated with lactation persistency, female fertility traits (age at first service, cow first service to conception, heifer and cow nonreturn rates), longevity traits (herd life, indirect herd life, and direct herd life), and lifetime profit index in the North American Holstein dairy cattle population...
November 23, 2016: Journal of Dairy Science
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