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Journal of Dairy Science

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https://www.readbyqxmd.com/read/28734602/fatty-acids-vitamins-and-cholesterol-content-and-sensory-properties-of-cheese-made-with-milk-from-sheep-fed-rapeseed-oilcake
#1
A I Nájera, M A Bustamante, M Albisu, I Valdivielso, G Amores, N Mandaluniz, J Arranz, L J R Barron, M de Renobales
The aim of the present study was to evaluate the influence of rapeseed oilcake used for feeding sheep on the content of fatty acids (FA), tocopherols, retinoids, and cholesterol of milk and cheese, and on the sensory properties of cheese. Indoor animal feeding (in winter) is the highest cost of production for cheesemakers, and the inclusion of locally produced rapeseed oilcake in the concentrate feed formulation can reduce the cost of cheese production, as long as the quality of the cheese is not altered. The experiment was carried out in March (mid lactation) with 72 Latxa sheep from an experimental farm located in the Basque Country (northern Spain)...
July 19, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28734601/influence-of-saccharomyces-cerevisiae-fermentation-products-smartcare-in-milk-replacer-and-original-xpc-in-calf-starter-on-the-performance-and-health-of-preweaned-holstein-calves-challenged-with-salmonella-enterica-serotype-typhimurium
#2
T L Harris, Y Liang, K P Sharon, M D Sellers, I Yoon, M F Scott, J A Carroll, M A Ballou
This study was designed to investigate the effects of supplementing SmartCare (SC; Diamond V, Cedar Rapids, IA) in milk replacer and Original XPC (XPC; Diamond V) in calf starter on performance and health of preweaned calves following an oral challenge with Salmonella enterica. The study was performed in two 35-d periods with 30 Holstein bull calves (2 ± 1 d of age) per period. In each period, calves were blocked by location in the barn and randomly assigned to treatments that included control, base milk replacer and calf starter with no added Saccharomyces cerevisiae fermentation products; SC, milk replacer with 1 g of SC/calf per day and base calf starter; and SC+XPC, milk replacer with 1 g of SC/calf per day and calf starter with 0...
July 19, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28734600/tracking-amazonian-cheese-microbial-diversity-development-of-an-original-sustainable-and-robust-starter-by-freeze-drying-spray-drying
#3
A A Ferreira, S Huang, Í T Perrone, P Schuck, G Jan, A F Carvalho
The Marajó cheese made with raw buffalo milk in the Amazon region of Brazil can be considered a good source of wild lactic acid bacteria strains with unexplored and promising characteristics. The aim of this study was to develop a potential probiotic starter culture for industrial applications using freeze drying and spray drying. A decrease in the survival rates of freeze-dried samples compared with spray-dried samples was noted. The spray-dried cultures remained approximately 10(9) cfu·g(-1), whereas the freeze-dried samples showed 10(7) cfu·g(-1) after 60 d of storage at 4°C...
July 19, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28734599/short-communication-survival-of-vaccinia-virus-in-inoculated-cheeses-during-60-day-ripening
#4
Izabelle S Rehfeld, Ana Luiza S Fraiha, Ana Carolina D Matos, Maria Isabel M C Guedes, Erica A Costa, Marcelo R de Souza, Luigi F L Cavalcante, Zélia I P Lobato
Bovine vaccinia is a neglected zoonosis caused by Vaccinia virus (VACV) and has a major economic and public health effect in Brazil. Previous studies showed infectious VACV particles in milk from either experimentally or naturally infected cows and in fresh cheeses prepared with experimentally contaminated milk. Ripening is a process that leads to major changes in the physical and chemical characteristics of cheese, reducing contamination by spoilage, pathogenic microorganisms, or both. However, it is not known if VACV infectious particles persist after the ripening process...
July 19, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28711271/identification-of-dipeptidyl-peptidase-iv-inhibitory-peptides-from-mare-whey-protein-hydrolysates
#5
J J Song, Q Wang, M Du, X M Ji, X Y Mao
Inhibition of dipeptidyl peptidase-IV (DPP-IV) activity is a promising strategy for treatment of type 2 diabetes. In current study, DPP-IV inhibitory peptides were identified from mare whey protein hydrolysates obtained by papain. The results showed that all the mare whey protein hydrolysates obtained at various hydrolysis durations possessed more potent DPP-IV inhibitory activity in comparison with intact whey protein. The 4-h hydrolysates showed the greatest DPP-IV inhibitory activity with half-maximal inhibitory concentration of 0...
July 12, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28711270/evaluation-of-the-yield-molar-mass-of-exopolysaccharides-and-rheological-properties-of-gels-formed-during-fermentation-of-milk-by-streptococcus-thermophilus-strains-st-143-and-st-10255y
#6
Som N Khanal, John A Lucey
The yield and chemical structures of exopolysaccharides (EPS) produced by many strains of Streptococcus thermophilus have been characterized. However, the kinetics (or production profile) for EPS during milk fermentation is not clear. In this study, we investigated whether any differences existed in the yield and molar mass of EPS when milk was fermented at the same acidification rate by 2 strains of S. thermophilus (St-143 and ST-10255y). The type of EPS produced by these 2 strains is different. Milk samples were analyzed for EPS concentration every 30 min during a fermentation period of 270 min (final pH 4...
July 12, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28711269/development-of-an-isothermal-amplification-based-assay-for-the-rapid-visual-detection-of-salmonella-bacteria
#7
Hai-Bin Liu, Yu-Xuan Zang, Xin-Jun Du, Ping Li, Shuo Wang
The efficient and timely detection of pathogens is a major concern worldwide. The aim of this study was to establish a rapid detection method for Salmonella bacteria in food samples to facilitate timely treatment. Widely used detection methods currently include culture-based methods and PCR-based methods. The former are time consuming, requiring 2 to 3 d, whereas the latter have higher accuracy but are typically complicated, requiring expertise and expensive instruments. In this study, a sensitive and rapid approach for the visual and point-of-use detection of Salmonella bacteria based on recombinase polymerase amplification (RPA) and a lateral-flow (LF) nucleic acid strip was established...
July 12, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28711268/short-communication-implementation-of-a-breeding-value-for-heat-tolerance-in-australian-dairy-cattle
#8
Thuy T T Nguyen, Phil J Bowman, Mekonnen Haile-Mariam, Gert J Nieuwhof, Benjamin J Hayes, Jennie E Pryce
Excessive ambient temperature and humidity can impair milk production and fertility of dairy cows. Selection for heat-tolerant animals is one possible option to mitigate the effects of heat stress. To enable selection for this trait, we describe the development of a heat tolerance breeding value for Australian dairy cattle. We estimated the direct genomic values of decline in milk, fat, and protein yield per unit increase of temperature-humidity index (THI) using 46,726 single nucleotide polymorphisms and a reference population of 2,236 sires and 11,853 cows for Holsteins and 506 sires and 4,268 cows for Jerseys...
July 12, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28711267/a-comparative-study-of-the-in-vitro-activity-of-iodopropynyl-butylcarbamate-and-amphotericin-b-against-prototheca-spp-isolates-from-european-dairy-herds
#9
T Jagielski, Z Bakuła, S Di Mauro, C Casciari, V Cambiotti, H Krukowski, B Turchetti, M Ricchi, E Manuali, P Buzzini
The objective of this study was to assess the in vitro effect of iodopropynyl butylcarbamate (IPBC) and amphotericin B (AMB) on Prototheca zopfii genotype 2 and Prototheca blaschkeae isolates recovered from dairy herds of Belgium, France, Italy, Germany, and Poland. The combination of IPBC with AMB on Prototheca isolates and toxicity of IPBC to the bovine mammary epithelial cells were also evaluated. The in vitro activity of IPBC and AMB against 96 isolates of P. zopfii genotype 2 and 42 isolates of P. blaschkeae was performed...
July 12, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28711266/intravaginal-instillation-of-gonadotropin-releasing-hormone-analogues-with-an-absorption-enhancer-induced-a-surge-of-luteinizing-hormone-in-lactating-dairy-cows
#10
R Wijma, M L Stangaferro, M Masello, M A Elmetwally, G E Granados, F Amovilli, J O Giordano
Our objectives were to evaluate circulating LH concentrations after intravaginal (IVG) instillation of GnRH analogs in lactating dairy cows. In 2 experiments, lactating Holstein cows (experiment 1: n = 32; experiment 2: n = 47) received the experimental treatments 48 h after the first of 2 PGF2α treatments given 12 h apart and 7 d after a modified Ovsynch protocol (GnRH at -7 d, PGF2α at -24 h, PGF2α at -56 h, GnRH at 0 h). In experiment 1, cows were stratified by parity and randomly allocated to receive the following treatments: 2 mL of saline IVG (SAL, n = 6), 100 µg of gonadorelin (Gon) i...
July 12, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28711265/feeding-a-concentrate-rich-in-rapeseed-oil-improves-fatty-acid-composition-and-flavor-in-norwegian-goat-milk
#11
R A Inglingstad, S Skeie, G E Vegarud, T G Devold, Y Chilliard, M Eknæs
Impaired quality due to a high content of free fatty acids (FFA) and off-flavors has caused challenges in the development of Norwegian goat milk products. The present study aimed to examine the effect of lipid-supplemented concentrates on milk fat content, fatty acid composition, FFA, lipoprotein lipase activity, sensory properties, and size of milk fat globules of goat milk. Thirty goats assigned to 3 experimental groups were fed different concentrates from 60 d in milk (DIM) until late lactation (230 DIM)...
July 12, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28711264/the-growth-and-aflatoxin-production-of-aspergillus-flavus-strains-on-a-cheese-model-system-are-influenced-by-physicochemical-factors
#12
Rocío Casquete, María José Benito, María de Guía Córdoba, Santiago Ruiz-Moyano, Alberto Martín
Traditional cheeses may be contaminated by aflatoxin-producing Aspergillus flavus during the ripening process, which has not been sufficiently taken into account. The objectives of this study were to evaluate the influence of water activity (aw), pH, and temperature on the lag phases, growth, and aflatoxin production of 3 A. flavus strains (CQ7, CQ8, and CG103) on a cheese-based medium. The results showed that the behavior of A. flavus strains was influenced by pH, aw, and temperature conditions. The CQ7 strain showed the maximum growth at pH 5...
July 12, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28711263/robotic-milking-technology-farm-design-and-effects-on-work-flow
#13
Jack Rodenburg
Robotic milking reduces labor demands on dairy farms of all sizes and offers a more flexible lifestyle for farm families milking up to 250 cows. Because milking is voluntary, barn layouts that encourage low-stress access by providing adequate open space near the milking stations and escape routes for waiting cows improve milking frequency and reduce fetching. Because lame cows attend less often, preventing lameness with comfortable stalls, clean alley floors, and effective foot bathing warrants special emphasis in robotic dairies...
July 12, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28711262/genetic-and-nongenetic-factors-associated-with-milk-color-in-dairy-cows
#14
S Scarso, S McParland, G Visentin, D P Berry, A McDermott, M De Marchi
Milk color is one of the sensory properties that can influence consumer choice of one product over another and it influences the quality of processed dairy products. This study aims to quantify the cow-level genetic and nongenetic factors associated with bovine milk color traits. A total of 136,807 spectra from Irish commercial and research herds (with multiple breeds and crosses) were used. Milk lightness ( Lˆ*) red-green index ( aˆ*) and yellow-blue index ( bˆ*) were predicted for individual milk samples using only the mid-infrared spectrum of the milk sample...
July 12, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28711261/the-effect-of-mycobacterium-avium-subspecies-paratuberculosis-infection-on-clinical-mastitis-occurrence-in-dairy-cows
#15
G Rossi, Y T Grohn, Y H Schukken, R L Smith
Endemic diseases can be counted among the most serious sources of losses for livestock production. In dairy farms in particular, one of the most common diseases is Johne's disease, caused by Mycobacterium avium ssp. paratuberculosis (MAP). Infection with MAP causes direct costs because it affects milk production, but it has also been suspected to increase the risk of clinical mastitis (CM) among infected animals. This might contribute to further costs for farmers. We asked whether MAP infection represents a risk factor for CM and, in particular, whether CM occurrences were more common in MAP-infected animals...
July 12, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28711260/short-communication-effects-of-an-immunomodulatory-feed-additive-on-phagocytic-capacity-of-neutrophils-and-relative-gene-expression-in-circulating-white-blood-cells-of-transition-holstein-cows
#16
Z H Wu, Y Yu, G M Alugongo, J X Xiao, J H Li, Y X Li, Y J Wang, S L Li, Z J Cao
High-producing dairy cows typically experience immunosuppression with dysregulated neutrophil function (e.g., compromised phagocytosis) during the transition period (3 wk before to 3 wk after parturition), which is causally associated with increased risk of infections. Enhanced neutrophil immune competence has significant bearing with the wellbeing of transition dairy cattle. In the current study, we investigated the effect of OmniGen-AF (OG; Phibro Animal Health, Quincy, IL) and its dose in modulation of neutrophil function of transition cows...
July 12, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28711259/effect-of-dairy-product-environment-on-the-growth-of-bacillus-cereus
#17
E Tirloni, E Ghelardi, F Celandroni, C Bernardi, S Stella
pH is one of the most important parameters to manage bacterial replication in foodstuffs. In this study, the ability of 2 Bacillus cereus strains, one clinical human isolate (GPe2) and one isolate from a dairy products (D43), were investigated for the in vitro growth at different pH values (from 3.5 to 7.5) at 2 temperatures (15 and 37°C), showing their ability to grow from 5.5 to 7.5 and from 5.0 to 7.5, respectively. The ability of spores of these 2 microorganisms to germinate in different typologies of dairy products (unflavored yogurt, Taleggio cheese, mascarpone cheese, and raw and pasteurized milk) was also investigated by inoculating the spores and maintaining the products at 15°C...
July 12, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28711258/strains-of-the-lactobacillus-casei-group-show-diverse-abilities-for-the-production-of-flavor-compounds-in-2-model-systems
#18
Ewelina Stefanovic, Anne Thierry, Marie-Bernadette Maillard, Andrea Bertuzzi, Mary C Rea, Gerald Fitzgerald, Olivia McAuliffe, Kieran N Kilcawley
Cheese flavor development is directly connected with the metabolic activity of microorganisms used during its manufacture, and the selection of metabolically diverse strains represents a potential tool for the production of cheese with novel and distinct flavor characteristics. Strains of Lactobacillus have been proven to promote the development of important cheese flavor compounds. As cheese production and ripening are long-lasting and expensive, model systems have been developed with the purpose of rapidly screening lactic acid bacteria for their flavor potential...
July 12, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28711257/seasonal-and-maternal-effects-on-acid-base-l-lactate-electrolyte-and-hematological-status-of-205-dairy-calves-born-to-eutocic-dams
#19
L Kovács, F L Kézér, E Albert, F Ruff, O Szenci
In this study, we used linear mixed models to determine the effects of season, time of sampling relative to birth (factors), duration of the delivery process, duration of maternal grooming, calf body weight (BW) at birth, and time of day (covariates) on values of venous blood gas, acid-base and electrolyte parameters, and l-lactate concentrations in dairy calves born to eutocic dams in summer (SUM, n = 101) and winter (WIN, n = 104). Neonatal vitality was assessed at 0, 1, and 24 h after delivery in a linear scoring system using muscle tone, erection of the head, muscle reflexes, heart rate, and sucking drive as criteria...
July 12, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28711256/associations-between-paratuberculosis-elisa-results-and-test-day-records-of-cows-enrolled-in-the-irish-johne-s-disease-control-program
#20
Bruno G Botaro, Elodie Ruelle, Simon J More, Sam Strain, David A Graham, Joe O'Flaherty, Laurence Shalloo
The effect of the Mycobacterium avium ssp. paratuberculosis (MAP) ELISA status on test-day milk performance of cows from Irish herds enrolled in the pilot national voluntary Johne's disease control program during 2013 to 2015 was estimated. A data set comprising 92,854 cows and 592,623 complete test-day records distributed across 1,700 herds was used in this study. The resulting ELISA outcome (negative, inconclusive, and positive) of each cow within each year of the program was used to allocate the cow into different scenarios representing the MAP status...
July 12, 2017: Journal of Dairy Science
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