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Journal of Dairy Science

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https://www.readbyqxmd.com/read/28237602/effects-of-intramuscular-injections-of-folic-acid-vitamin-b12-or-both-on-lactational-performance-and-energy-status-of-multiparous-dairy-cows
#1
M Duplessis, H Lapierre, D Pellerin, J-P Laforest, C L Girard
The purpose of this experiment was to gain understanding on changes in energy partitioning when folic acid and vitamin B12 supplements, alone or combined, were given by weekly intramuscular injections from 3 wk before the expected calving date until 7 wk postpartum. Twenty-four multiparous cows were assigned to 6 blocks of 4 cows each according to previous 305-d lactation yield to either 0 or 320 mg of folic acid and 0 or 10 mg of vitamin B12 in a 2 × 2 factorial arrangement. Plasma concentration of folates was increased by folic acid supplement, and this increase was greater with the combined supplement...
February 22, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28237601/short-communication-optimization-of-a-timed-artificial-insemination-program-for-reproductive-management-of-heifers-in-canadian-dairy-herds
#2
K Macmillan, K Loree, R J Mapletoft, M G Colazo
Pregnancy per AI (P/AI) following the use of 1 of 2 timed AI (TAI) protocols and 2 different intervals between TAI and resynchronization were compared in heifers that were inseminated with either conventional or sex-sorted semen. Holstein heifers (n = 317; 527 inseminations) were submitted to a 5-d Cosynch protocol with (+) or without (-) GnRH at the time of controlled internal drug release (CIDR) insertion on d 0, CIDR removal and a single PGF2α treatment on d 5, and TAI plus GnRH on d 8 (72 h later). Visual estrus detection (ED) was conducted on d 6 in the afternoon and d 7 in the morning and heifers observed in estrus were artificially inseminated on d 7 in the afternoon...
February 22, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28237600/chromium-concentrations-in-ruminant-feed-ingredients
#3
J W Spears, K E Lloyd, K Krafka
Chromium (Cr), in the form of Cr propionate, has been permitted for supplementation to cattle diets in the United States at levels up to 0.50 mg of Cr/kg of DM since 2009. Little is known regarding Cr concentrations naturally present in practical feed ingredients. The present study was conducted to determine Cr concentrations in feed ingredients commonly fed to ruminants. Feed ingredients were collected from dairy farms, feed mills, grain bins, and university research farms. Mean Cr concentrations in whole cereal grains ranged from 0...
February 22, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28237599/prevalence-antimicrobial-resistance-and-molecular-characterization-of-campylobacter-spp-in-bulk-tank-milk-and-milk-filters-from-us-dairies
#4
Laura P Del Collo, Jeffrey S Karns, Debabrata Biswas, Jason E Lombard, Bradd J Haley, R Camilla Kristensen, Christine A Kopral, Charles P Fossler, Jo Ann S Van Kessel
Campylobacter spp. are frequently isolated from dairy cows as commensal organisms. Sporadic Campylobacter infections in humans in the United States are generally attributed to poultry, but outbreaks are also commonly associated with dairy products, particularly unpasteurized or raw milk. Bulk tank milk samples and milk filters from US dairy operations were collected during the National Animal Health Monitoring System Dairy 2014 study and analyzed using real-time PCR and traditional culture techniques for the presence of thermophilic Campylobacter species...
February 22, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28237598/characterization-of-major-and-trace-minerals-fatty-acid-composition-and-cholesterol-content-of-protected-designation-of-origin-cheeses
#5
C L Manuelian, S Currò, M Penasa, M Cassandro, M De Marchi
Cheese provides essential nutrients for human nutrition and health, such as minerals and fatty acids (FA). Its composition varies according to milk origin (e.g., species and breed), rearing conditions (e.g., feeding and management), and cheese-making technology (e.g., coagulation process, addition of salt, ripening period). In recent years, cheese production has increased worldwide. Italy is one of the main producers and exporters of cheese. This study aimed to describe mineral, FA, and cholesterol content of 133 samples from 18 commercial cheeses from 4 dairy species (buffalo, cow, goat, and sheep) and from 3 classes of moisture content (hard, <35% moisture; semi-hard, 35-45%; and soft, >45%)...
February 22, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28237597/comparison-of-immune-responses-in-calves-fed-heat-treated-or-unheated-colostrum
#6
S L Gelsinger, A J Heinrichs
Understanding the mechanisms that underlie neonatal immune function is important for appropriately treating and preventing disease. Cytokines provided in colostrum may affect immune development and function, but data describing cytokine absorption in calves and the effects of colostrum heat treatment on absorption are limited. The objectives of this experiment were to characterize immune responses in calves that received heat-treated (HT) or unheated (UH) colostrum (in terms of growth, rectal temperature, and blood cytokine and IgG concentrations) and to determine calves' ability to absorb IFNγ and IL1β from HT and UH colostrum...
February 22, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28237596/the-effect-of-milk-feeding-method-and-hay-provision-on-the-development-of-feeding-behavior-and-non-nutritive-oral-behavior-of-dairy-calves
#7
K C Horvath, E K Miller-Cushon
We investigated the interactive effects of common feeding management factors on the development of feeding and non-nutritive oral behaviors in preweaned calves through the weaning transition. Calves were randomly assigned to 1 of 3 treatments that differed by milk-feeding method (teat or bucket) and ad libitum access to chopped timothy hay: control, milk provided by bucket and no access to hay (CON; n = 10); milk provided by bucket and access to hay (H; n = 10); milk provided via a teat and access to hay (TH; n = 10)...
February 22, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28237595/effect-of-short-term-feed-restriction-on-temporal-changes-in-milk-components-and-mammary-lipogenic-gene-expression-in-mid-lactation-holstein-dairy-cows
#8
A M Abdelatty, M E Iwaniuk, M Garcia, K M Moyes, B B Teter, P Delmonte, A K G Kadegowda, M A Tony, F F Mohamad, R A Erdman
Investigations of the temporal changes in mammary gene expression that occur during sudden diet change have been limited by the use of mammary tissue as the source of RNA because of the invasive nature of mammary biopsy procedures. However, the cytosolic crescent, present in 1% of the largest milk fat globules, contains mammary epithelial cell RNA that has become trapped between the inner and outer milk fat globule membranes during final formation and secretion of milk fat into the lumen of the mammary alveoli...
February 22, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28237594/efficacy-of-a-high-free-iodine-barrier-teat-disinfectant-for-the-prevention-of-naturally-occurring-new-intramammary-infections-and-clinical-mastitis-in-dairy-cows
#9
C M M R Martins, E S C Pinheiro, M Gentilini, M Lopez Benavides, M V Santos
Using a natural exposure trial design, the goal of our study was to evaluate the clinical efficacy of an iodine teat disinfectant with barrier properties and a high level of free iodine relative to a conventional iodine teat disinfectant with no barrier properties and low levels of free iodine. During the 18 wk of the trial, quarter milk samples were collected every 2 wk from 385 dairy cows from 2 herds. Cows on both farms were assigned in a balanced way according to milk yield, number of lactation, days in milk, somatic cell count (SCC) and microbiology culture pretrial into one of following groups: nonbarrier post milking teat disinfectant (NBAR; n = 195 cows; 747 quarters) or barrier postmilking teat disinfectant (BAR; n = 190 cows; 728 quarters)...
February 22, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28237593/dairy-cows-with-prolonged-calving-seek-additional-isolation
#10
M V Rørvang, M S Herskin, M B Jensen
In modern calving facilities dairy cows either calve in a group pen or are moved to a separate individual pen when calving is imminent. In practice, cows are often moved too close to calving, which poses a health risk to cow and calf. Thus, a need exists for new calving facility designs and management practices that better align with the motivations of the cow. This study examined dairy cow preferences for individual calving pens by offering 3 different levels of isolation (tall and narrow, low and wide, and tall and wide) by analyzing the association between precalving behavior, choice of degree of isolation, and the progress of calving...
February 22, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28237592/enteric-methane-production-in-lactating-dairy-cows-with-continuous-feeding-of-essential-oils-or-rotational-feeding-of-essential-oils-and-lauric-acid
#11
G Klop, J Dijkstra, K Dieho, W H Hendriks, A Bannink
The rumen microbes can adapt to feed additives, which may make the decrease in enteric CH4 production upon feeding an additive a transient response only. This study investigated alternate feeding of 2 CH4 mitigating feed additives with a different mode of action on persistency of lowering CH4 production compared with feeding a single additive over a period of 10 wk. Four pairs of cows were selected, and within pairs, cows were randomly assigned to either the control (AR-AR) or the alternating (AR-LA) concentrate treatment...
February 22, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28237591/methionine-leucine-isoleucine-or-threonine-effects-on-mammary-cell-signaling-and-pup-growth-in-lactating-mice
#12
G M Liu, M D Hanigan, X Y Lin, K Zhao, F G Jiang, R R White, Y Wang, Z Y Hu, Z H Wang
Two studies were undertaken to assess the effects of individual essential AA supplementation of a protein-deficient diet on lactational performance in mice using litter growth rates as a response variable. The first study was designed to establish a dietary protein response curve, and the second to determine the effects of Leu, Ile, Met, and Thr supplementation of a protein-deficient diet on lactational performance. In both studies, dams were fed test diets from parturition through d 17 of lactation, when the studies ended...
February 22, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28237590/production-and-calving-traits-of-montbeliarde-%C3%A3-holstein-and-viking-red-%C3%A3-holstein-cows-compared-with-pure-holstein-cows-during-first-lactation-in-8-commercial-dairy-herds
#13
A R Hazel, B J Heins, L B Hansen
Montbeliarde (MO) × Holstein (HO) and Viking Red (VR) × HO crossbred cows were compared with pure HO cows in 8 large, high-performance dairy herds. All cows were either 2-breed crossbred or pure HO cows that calved for the first time from December 2010 to April 2014. Best Prediction was used to calculate 305-d milk, fat, and protein production, as well as somatic cell score, and 513 MO × HO, 540 VR × HO, and 978 HO cows were analyzed for production in first lactation. Calving difficulty was scored from 1 (no assistance) to 5 (extreme difficulty)...
February 22, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28237589/application-of-a-bacteriological-on-farm-test-to-reduce-antimicrobial-usage-in-dairy-cows-with-purulent-vaginal-discharge
#14
L V Madoz, I Prunner, M Jaureguiberry, C-C Gelfert, R L de la Sota, M J Giuliodori, M Drillich
The objective of this study was to assess the effect of a selective antibiotic treatment strategy based on a quick bacteriological on-farm test (Petrifilm, 3M Corp., St. Paul, MN) compared with the conventional antibiotic treatment of all cows having clinical endometritis (CE) defined by the presence of purulent vaginal discharge on both clinical cure rate and reproductive performance. The study was simultaneously conducted with dairy cows reared under a highly supplemented rotational grazing system in Argentina and in a freestall system in Slovakia...
February 22, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28237588/evaluating-a-commercial-pcr-assay-against-bacterial-culture-for-diagnosing-streptococcus-uberis-and-staphylococcus-aureus-throughout-lactation
#15
N M Steele, J H Williamson, R Thresher, R A Laven, J E Hillerton
The performance of a commercial, real-time PCR assay was compared with traditional bacterial culture for the identification of Streptococcus uberis and Staphylococcus aureus in bovine milk collected at different stages of lactation. Initial validation tests using fresh and frozen quarter milk samples identified factors that affected the success of the PCR. Therefore, the standard protocol was adjusted for samples collected at the first milking postpartum (colostrum) and from clinical mastitis cases. The adjustment involved PCR testing both undiluted and diluted (1 in 10 with sterile water) DNA extracts...
February 22, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28237587/hepatic-mrna-expression-for-genes-related-to-somatotropic-axis-glucose-and-lipid-metabolisms-and-inflammatory-response-of-periparturient-dairy-cows-treated-with-recombinant-bovine-somatotropin
#16
P R B Silva, W J Weber, B A Crooker, R J Collier, W W Thatcher, R C Chebel
Objectives of this experiment were to evaluate the effects of recombinant bovine somatotropin (rbST) treatment of periparturient dairy cows on hepatic mRNA expression for genes related to the somatotropic axis, insulin, glucose, and lipid metabolism, inflammation, and oxidative stress. Holstein cows were enrolled in the experiment at 253 ± 3 d of gestation and assigned to 1 of 3 treatments: untreated control (n = 53), 87.5 mg of rbST (n = 56; rbST87.5), and 125 mg of rbST (n = 57; rbST125). Cows in the rbST87...
February 22, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28237586/benchmarking-passive-transfer-of-immunity-and-growth-in-dairy-calves
#17
D J Atkinson, M A G von Keyserlingk, D M Weary
Poor health and growth in young dairy calves can have lasting effects on their development and future production. This study benchmarked calf-rearing outcomes in a cohort of Canadian dairy farms, reported these findings back to producers and their veterinarians, and documented the results. A total of 18 Holstein dairy farms were recruited, all in British Columbia. Blood samples were collected from calves aged 1 to 7 d. We estimated serum total protein levels using digital refractometry, and failure of passive transfer (FPT) was defined as values below 5...
February 22, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28237585/invited-review-determinants-of-farmers-adoption-of-management-based-strategies-for-infectious-disease-prevention-and-control
#18
Caroline Ritter, Jolanda Jansen, Steven Roche, David F Kelton, Cindy L Adams, Karin Orsel, Ron J Erskine, Geart Benedictus, Theo J G M Lam, Herman W Barkema
The prevention and control of endemic pathogens within and between farms often depends on the adoption of best management practices. However, farmers regularly do not adopt recommended measures or do not enroll in voluntary disease control programs. This indicates that a more comprehensive understanding of the influences and extension tools that affect farmers' management decisions is necessary. Based on a review of relevant published literature, we developed recommendations to support policy-makers, industry representatives, researchers, veterinarians, and other stakeholders when motivating farmers to adopt best management practices, and to facilitate the development and implementation of voluntary prevention and control programs for livestock diseases...
February 22, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28237584/economic-opportunities-for-using-sexed-semen-and-semen-of-beef-bulls-in-dairy-herds
#19
J F Ettema, J R Thomasen, L Hjortø, M Kargo, S Østergaard, A C Sørensen
Dairy farmers can increase the number of dairy heifer calves born in their herd by using sexed semen. They can reduce the number of both dairy bull and heifer calves by using beef semen. Long before sexed semen became commercially available, it was believed that it would provide opportunities for increasing genetic level in both herds and populations. In this study, we studied the potential for increasing the genetic level of a herd by using beef semen in combination with sexed semen. We tested the hypothesis that the potential of increasing the genetic level and the overall net return would depend on herd management...
February 22, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28237583/effects-of-niacin-and-betaine-on-bovine-mammary-and-uterine-cells-exposed-to-thermal-shock-in-vitro
#20
Y Xiao, S Rungruang, L W Hall, J L Collier, F R Dunshea, R J Collier
The objective of this study was to investigate the direct effects of feed supplements niacin and betaine on the heat shock responses of in vitro cultured cells derived from bovine mammary and uterine tissues. First, we determined the mRNA expression profiles of the niacin receptor (GPR109A) in bovine tissues (liver, skin, uterus, udder, and ovary) and in cells derived from bovine mammary epithelium (mammary alveolar cells, MAC-T; bovine mammary epithelial cells, BMEC) and endometrium (bovine endometrial cells, BEND)...
February 22, 2017: Journal of Dairy Science
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