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https://www.readbyqxmd.com/read/28534031/incomplete-milking-in-early-lactation-does-not-affect-dairy-cows-resting-behaviors-results-from-a-randomized-controlled-trial
#1
Catarina Krug, Trevor J DeVries, Jean-Philippe Roy, Jocelyn Dubuc, Simon Dufour
The objective of this study was to investigate the effect of incomplete milking during the first 5 days of lactation on the resting behavior of commercial dairy cows. The hypothesis was that the elevated intramammary pressure resulting from milk retained in the udder in incompletely milked cows could lead to a change in lying behavior. This study was a randomized controlled trial in which cows from two farms were randomly allocated into a treatment (n = 18) or a control group (n = 14). Cows in the treatment group were milked incompletely (10-14 L/days) during the first 5 days of lactation, while cows in the control group were milked as usually done on farm...
2017: Frontiers in Veterinary Science
https://www.readbyqxmd.com/read/28532823/effects-of-rumen-protected-methionine-and-choline-supplementation-on-steroidogenic-potential-of-the-first-postpartum-dominant-follicle-and-expression-of-immune-mediators-in-holstein-cows
#2
D A V Acosta, M I Rivelli, C Skenandore, Z Zhou, D H Keisler, D Luchini, M N Corrêa, F C Cardoso
Multiparous Holstein cows were assigned in a randomized complete block design into four treatments from 21 d before calving to 30 d in milk (DIM). Treatments were: MET [n = 19, fed the basal diet + rumen-protected methionine at a rate of 0.08% (w/w) of the dry matter, Smartamine(®) M], CHO (n = 17, fed the basal diet + choline 60 g/d, Reashure(®)), MIX (n = 21, fed the basal diet + Smartamine(®) M at a rate of 0.08% (w/w) of the dry matter and 60 g/d Reashure(®)), and CON (n = 20, no supplementation, fed the close-up and fresh cow diets)...
July 1, 2017: Theriogenology
https://www.readbyqxmd.com/read/28532526/effect-of-feeding-long-or-short-wheat-hay-v-wheat-silage-in-the-ration-of-lactating-cows-on-intake-milk-production-and-digestibility
#3
Y Shaani, M Nikbachat, E Yosef, Y Ben-Meir, I Mizrahi, J Miron
The objective of this study was to evaluate in lactating cows the effect of either chopping or ensiling of wheat roughage on: intake, digestibility, lactation performance and animal behavior. Three groups of 14 lactating cows each, were fed total mixed rations (TMRs) based on either long wheat hay (HL), short wheat hay (HS) or wheat silage (SI), as the sole roughage source (30% of TMR dry matter (DM)). Parameters examined: sorting behavior, DM intake, milk yield and composition, rumination, recumbence, average daily rumen pH, digesta passage rate, and in-vivo digestibility...
May 23, 2017: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/28529688/the-prevalence-temporal-and-spatial-trends-in-bulk-tank-equivalent-milk-fat-depression-in-irish-milk-recorded-herds
#4
Catherine I Carty, Alan G Fahey, Morgan R Sheehy, Steve Taylor, Ian J Lean, Conor G McAloon, Luke O'Grady, Finbar J Mulligan
BACKGROUND: Milk fat is important in terms of economic value and in its potential to provide information concerning cow diet and health. Under current milk payment schemes in Ireland farmer income is directly linked to milk fat production. METHODS: A descriptive analysis of milk fat depression (MFD) as calculated from test day milk recording data across all milk recording herds from 2004 to 2014 was undertaken. A dataset of 17 million test day records was used to calculate the prevalence of MFD in Irish milk recorded herds and to create a graphical description of the major descriptive epidemiological trends in milk fat depression in time and space in Ireland...
2017: Irish Veterinary Journal
https://www.readbyqxmd.com/read/28527809/accuracy-of-genomic-predictions-in-gyr-bos-indicus-dairy-cattle
#5
S A Boison, A T H Utsunomiya, D J A Santos, H H R Neves, R Carvalheiro, G Mészáros, Y T Utsunomiya, A S do Carmo, R S Verneque, M A Machado, J C C Panetto, J F Garcia, J Sölkner, M V G B da Silva
Genomic selection may accelerate genetic progress in breeding programs of indicine breeds when compared with traditional selection methods. We present results of genomic predictions in Gyr (Bos indicus) dairy cattle of Brazil for milk yield (MY), fat yield (FY), protein yield (PY), and age at first calving using information from bulls and cows. Four different single nucleotide polymorphism (SNP) chips were studied. Additionally, the effect of the use of imputed data on genomic prediction accuracy was studied...
May 17, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28527807/dna-carryover-in-milk-samples-from-routine-milk-recording-used-for-pcr-based-diagnosis-of-bovine-staphylococcus-aureus-mastitis
#6
Yasser S Mahmmod, Ilka C Klaas, Carsten Enevoldsen
Real-time PCR techniques are increasingly used to detect udder pathogens from milk samples collected non-aseptically at routine milk recording. The objectives of this study were (1) to estimate the statistical associations between cycle threshold (Ct) values for Staphylococcus aureus in non-aseptically collected composite samples taken at routine milk recording from cows milked consecutively with the same milking unit and milk meter; and (2) to formulate practical and plausible guidelines for understanding the diagnostic implications of PCR testing for Staph...
May 17, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28527805/effects-of-replacement-of-late-harvested-grass-silage-and-barley-with-early-harvested-silage-on-milk-production-and-methane-emissions
#7
E H Cabezas-Garcia, S J Krizsan, K J Shingfield, P Huhtanen
This study evaluated the effects of gradual replacement of a mixture of late-cut grass silage (LS) and barley with early-cut grass silage (ES) on milk production, CH4 emissions, and N utilization in Swedish Red cows. Two grass silages were prepared from the same primary growth of timothy grass sward but harvested 2 wk apart [11.0 and 9.7 MJ of metabolizable energy/kg of dry matter (DM)]. Four diets, fed as a total mixed ration, were formulated to meet the metabolizable energy and protein requirements of 35 kg of energy-corrected milk (ECM) by gradually replacing a mixture of LS and barley with ES (0, 33, 67, and 100% of the forage component of the diet), whereas the proportion of barley decreased from 47...
May 17, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28527803/using-brown-midrib-6-dwarf-forage-sorghum-silage-and-fall-grown-oat-silage-in-lactating-dairy-cow-rations
#8
M T Harper, J Oh, F Giallongo, J C Lopes, G W Roth, A N Hristov
Double cropping and increasing crop diversity could improve dairy farm economic and environmental sustainability. In this experiment, corn silage was partially replaced with 2 alternative forages, brown midrib-6 brachytic dwarf forage sorghum (Sorghum bicolor) or fall-grown oat (Avena sativa) silage, in the diet of lactating dairy cows. We investigated the effect on dry matter (DM) intake, milk yield (MY), milk components and fatty acid profile, apparent total-tract nutrient digestibility, N utilization, enteric methane emissions, and income over feed cost...
May 17, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28527801/genetic-and-nongenetic-factors-contributing-to-differences-in-%C3%AE-s-casein-phosphorylation-isoforms-and-other-major-milk-proteins
#9
Z H Fang, H Bovenhuis, A Delacroix-Buchet, G Miranda, D Boichard, M H P W Visker, P Martin
Relative concentrations of αS-casein (αS-CN) phosphorylation isoforms vary considerably among milk of individual cows. We aimed to explore to what extent genetic and other factors contribute to the variation in relative concentrations of αS-CN phosphorylation isoforms and the phosphorylation degree of αS-CN defined as the proportion of isoforms with higher degrees of phosphorylation. We also investigated the associations of genetic variants of milk proteins and casein haplotypes with relative concentrations of αS-CN phosphorylation isoforms and with the phosphorylation degree of αS-CN in French Montbéliarde cattle from the cheese production area of Franche-Comté...
May 17, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28527799/effect-of-yeast-supplementation-on-performance-rumination-time-and-rumen-ph-of-dairy-cows-in-commercial-farm-environments
#10
V Ambriz-Vilchis, N S Jessop, R H Fawcett, M Webster, D J Shaw, N Walker, A I Macrae
The aims of the present study were to evaluate the effects of live yeast supplementation (Vistacell MUCL 39855, AB Vista, Marlborough, UK) on performance, rumination time, and rumen pH on dairy cows in commercial farm environments. Three trials were carried out, the trials lasted 12 (trial 1), 15 (trial 2), and 19 wk (trial 3). In each trial, 14 multiparous Holstein dairy cows were allocated to 2 groups that received (trial 1) a standard diet plus yeast, (trial 2) an acidogenic diet plus yeast, and (trial 3) grazing pasture plus yeast...
May 17, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28527798/short-communication-effect-of-a-citrus-extract-in-lactating-dairy-cows
#11
Y Ying, M Niu, A R Clarke, K J Harvatine
Dry matter intake is a main driver of energy balance in lactating dairy cows, and some plant extracts have been commercially fed to dairy cows to stimulate feed intake. Citrus extracts contain several bioactive components and have been shown to modify metabolism in other animal models. Our hypothesis was that a citrus extract would increase dry matter intake. Two experiments were conducted to determine the effect of a citrus extract on intake and milk production in lactating dairy cows. In experiment one, 11 early-lactation dairy cows (experiment 1; 77 ± 15 d in milk, mean ± standard deviation) were used in a switchback design, and in experiment two, 15 mid-lactation Holstein cows (experiment 2; 157 ± 44 d in milk, mean ± standard deviation) were used in a crossover design...
May 17, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28527796/genetic-parameters-of-mid-infrared-methane-predictions-and-their-relationships-with-milk-production-traits-in-holstein-cattle
#12
P B Kandel, M-L Vanrobays, A Vanlierde, F Dehareng, E Froidmont, N Gengler, H Soyeurt
Many countries have pledged to reduce greenhouse gases. In this context, the dairy sector is one of the identified sectors to adapt production circumstances to address socio-environmental constraints due to its large carbon footprint related to CH4 emission. This study aimed mainly to estimate (1) the genetic parameters of 2 milk mid-infrared-based CH4 proxies [predicted daily CH4 emission (PME, g/d), and log-transformed predicted CH4 intensity (LMI)] and (2) their genetic correlations with milk production traits [milk (MY), fat (FY), and protein (PY) yields] from first- and second-parity Holstein cows...
May 17, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28527795/the-use-of-mid-infrared-spectrometry-to-estimate-the-ration-composition-of-lactating-dairy-cows
#13
M Klaffenböck, A Steinwidder, C Fasching, G Terler, L Gruber, G Mészáros, J Sölkner
The composition of cow milk is strongly affected by the feeding regimen. Because milk components are routinely determined using mid-infrared (MIR) spectrometry, MIR spectra could also be used to estimate an animal's ration composition. The objective of this study was to determine whether and how well amounts of dry matter intake and the proportions of concentrates, hay, grass silage, maize silage, and pasture in the total ration can be estimated using MIR spectra at an individual animal level. A total of 10,200 milk samples and sets of feed intake data were collected from 90 dairy cows at 2 experimental farms of the Agricultural Research and Education Centre in Raumberg-Gumpenstein, Austria...
May 17, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28527793/prevalence-of-non-aureus-staphylococcus-species-causing-intramammary-infections-in-canadian-dairy-herds
#14
Larissa A Z Condas, Jeroen De Buck, Diego B Nobrega, Domonique A Carson, Sohail Naushad, Sarne De Vliegher, Ruth N Zadoks, John R Middleton, Simon Dufour, John P Kastelic, Herman W Barkema
Non-aureus staphylococci (NAS), the microorganisms most frequently isolated from bovine milk worldwide, are a heterogeneous group of numerous species. To establish their importance as a group, the distribution of individual species needs to be determined. In the present study, NAS intramammary infection (IMI) was defined as a milk sample containing ≥1,000 cfu/mL in pure or mixed culture that was obtained from a cohort of cows assembled by the Canadian Bovine Mastitis Research Network. Overall, 6,213 (6.3%) of 98,233 quarter-milk samples from 5,149 cows and 20,305 udder quarters were associated with an NAS IMI...
May 17, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28525989/determination-of-genetic-effects-of-atf3-and-cdkn1a-genes-on-milk-yield-and-compositions-in-chinese-holstein-population
#15
REVIEW
Bo Han, Weijun Liang, Lin Liu, Yanhua Li, Dongxiao Sun
BACKGROUND: Our previous RNA-sequencing study revealed that the ATF3 and CDKN1A genes were remarkably differentially expressed between the mammary glands of lactating Holstein cows with extremely high and low milk protein and fat percentage so that both of them were considered as candidates for milk composition. Herein, we further verified whether these genes have genetic effects on milk production traits in a Chinese Holstein cow population. RESULTS: By re-sequencing the entire coding and regulatory regions, we identified four SNPs in 5'promoter region, two in exons, seven in 3' un-translated region (UTR), and six in 3'flanking region of ATF3 gene, and one SNP in exon 5, two in 3'UTR, and two in 3'flanking region of CDKN1A gene...
May 19, 2017: BMC Genetics
https://www.readbyqxmd.com/read/28525343/changes-of-hematological-and-biochemical-parameters-and-levels-of-pepsinogen-histamine-and-prostaglandins-in-dairy-cows-affected-with-left-displacement-of-the-abomasum
#16
O Al-Rawashdeh, Z Bani Ismail, A Talafha, A Al-Momani
The aims of this study were to determine the serum levels of pepsinogen, histamine, and prostaglandins F2α and E2 in lactating dairy cows affected with left displacement of the abomasum (LDA). In addition, the hematological and serum biochemical parameters were also determined in cows affected with LDA. A total of 52 adult lactating Holstein-Friesian cows affected with LDA and 30 normal cows (control) were used. In LDA cows, the average age, BCS and body weight were 4.9 ± 1.2 years, 2.5 ± 0.75, and 525 ± 150kg respectively...
March 28, 2017: Polish Journal of Veterinary Sciences
https://www.readbyqxmd.com/read/28525325/epidemiology-of-intramammary-infections-with-staphylococcus-aureus-and-mastitis-streptococci-in-a-dairy-cattle-herd-with-a-history-of-recurrent-clinical-mastitis
#17
H Vlkova, V Babak, I Vrtkova, D Cervinkova, D Marosevic, M Moravkova, Z Jaglic
The aim of the present work was to examine a dairy herd with an anamnesis of recurrent clinical mastitis and decreased milk production. A total of 239 individual cow milk samples originating from asymptomatic cows were collected at four-month intervals and examined mainly for the presence of Staphylococcus aureus and mastitis streptococci using standard cultivation methods. In total, 29.7% and 9.2% samples were positive for S. aureus and mastitis streptococci, respectively. Unlike for mastitis streptococci, the prevalence of animals positive for S...
March 28, 2017: Polish Journal of Veterinary Sciences
https://www.readbyqxmd.com/read/28524020/altered-gene-expression-of-epigenetic-modifying-enzymes-in-response-to-dietary-supplementation-with-linseed-oil
#18
Ran Li, Eveline M Ibeagha-Awemu
Recently we showed that 5% linseed oil (LSO) and 5% safflower oil (SFO) supplementation of cow's diets reduced milk fat yield by 30·38 and 32·42% respectively, accompanied by differential expression of genes and regulation by microRNAs (miRNA). This research communication addresses the hypothesis that epigenetic regulation could be involved in the observed milk fat reduction. Thus, this study investigated the gene expression pattern of major epigenetic modifying enzymes in response to dietary supplementation with LSO or SFO...
May 2017: Journal of Dairy Research
https://www.readbyqxmd.com/read/28524018/comparison-of-the-immune-responses-associated-with-experimental-bovine-mastitis-caused-by-different-strains-of-escherichia-coli
#19
Shlomo E Blum, Elimelech D Heller, Shamay Jacoby, Oleg Krifucks, Gabriel Leitner
We studied the mammary immune response to different mammary pathogenic Escherichia coli (MPEC) strains in cows, hypothesising that the dynamics of response would differ. E. coli is a major aetiologic agent of acute clinical bovine mastitis of various degrees of severity with specific strains being associated with persistent infections. We compared challenge with three distinct pathogenic MPEC strains (VL2874, VL2732 and P4), isolated from different forms of mastitis (per-acute, persistent and acute, respectively)...
May 2017: Journal of Dairy Research
https://www.readbyqxmd.com/read/28524016/towards-practical-application-of-sensors-for-monitoring-animal-health-the-effect-of-post-calving-health-problems-on-rumination-duration-activity-and-milk-yield
#20
Machteld Steensels, Ephraim Maltz, Claudia Bahr, Daniel Berckmans, Aharon Antler, Ilan Halachmi
Three sources of sensory data: cow's individual rumination duration, activity and milk yield were evaluated as possible indicators for clinical diagnosis, focusing on post-calving health problems such as ketosis and metritis. Data were collected from a computerised dairy-management system on a commercial dairy farm with Israeli Holstein cows. In the analysis, 300 healthy and 403 sick multiparous cows were studied during the first 3 weeks after calving. A mixed model with repeated measurements was used to compare healthy cows with sick cows...
May 2017: Journal of Dairy Research
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